Jesús Lubián Universidade Federal Fluminense
Antonio Moro Universidad de Sevilla
Miguel Marqués LPC-Caen
Filomena Nunes Michigan State University
Natalia Timofeyuk University of Surrey
Alessia Di Pietro Laboratori Nazionali del Sud (LNS) in Catania
Cédric Simenel The Australian National University
Chloë Hebborn Michigan State University
Peiwei Wen China Institute of Atomic Energy
Andrea Vitturi University of Padova
Wei Liu Peking University
Shinsuke Nakayama Nuclear Data Center, Japan Atomic Energy Agency (JAEA)
Nicolas Michel Institute of Modern Physics (Lanzhou)
Kostas Kravvaris Lawrence Livermore National Laboratory
Shin Watanabe National Institute of Technology, Gifu College (Japan)
Jagjit Singh Osaka University
Sandrine Courtin University of Strasbourg
Takashi Nakamura Tokyo Institute of Technology
Kazuki Yoshida Osaka University
In recent years, the study of inclusive breakup reactions has received renewed interest thanks to its many potential applications in the interpretation of nuclear reaction experiments with both stable and unstable beams. In this presentation, I will briefly review the inclusive breakup model proposed in the 1980s by Ichimura, Ichimura, Austern, and Vincent (IAV) and discuss its connection with other inclusive breakup models, such as the Hussein-McVoy model and its eikonal version, which has been standardly employed in the analysis of nucleon knockout reactions. I will also outline some possible extensions and applications of the IAV model, including the evaluation of incomplete fusion cross sections and the indirect extraction of cross sections through the so-called surrogate method.
View presentationAntonio Moro Professor, Universidad de Sevilla
Antonio Moro is Professor at the Department of Atomic, Molecular and Nuclear Physics of the University of Seville (Spain). He works in theoretical nuclear physics, with emphasis in the description of the structure and reactions of weakly-bound and exotic nuclei.
He obtained his PhD at the University of Seville (2001). Then, he moved to the Technical University of Lisbon where he worked as a postdoctoral fellow. In 2004, he returned to the University of Seville with a research contract, and in 2010 he became associate professor at this University.
Much of his research work has been performed in close collaboration with experimental groups, participating actively in the interpretation of nuclear reaction data measured at several radioactive beam facilities, such as ISOLDE (CERN), GANIL (France), RIBRAS (Brazil), Notre Dame (USA) and RIBF-RIKEN (Japan). At present, A.M. Moro is member of the INTC committee (ISOLDE/n_TOF) and the B-PAC of the RCNP facility at Osaka University.
We present a detailed discussion of a recently proposed method to evaluate complete and incomplete fusion cross sections for weakly bound systems. The method is applied to collisions of 7Li projectiles on different heavy targets, and the results are compared with the available data. The overall agreement between experiment and theory is fairly good. Some preliminary results on 6Li projectiles are also presented.
View presentationJesús Lubián Associate Professor, Universidade Federal Fluminense
Jesús Lubián is a theoretical nuclear physicist born in Havana Cuba who graduated in Physics at Moscow State University M.V. Lomonosov (1988) and Ph.D. in Physics at Centro de Estudos Aplicados al Desarrollo Nuclear, Havana Cuba (1995). He has experience in Nuclear Physics working in the Theory of Nuclear Reactions between stable and unstable nuclei at low and intermediate energies. He is now an associate professor at the Instituto de Física of Universidade Federal Fluminense ion Rio de Janeiro, Brazil
Already in the early 1960s, when physicists started to move away from the valley of stability, some ambitious ones tried to put several neutrons together and create "neutral nuclei" in their laboratories. They didn’t succeed, but the task was a very difficult (while fascinating) one, both from the construction and the detection points of view. Fascination overcame difficulty and other physicists kept trying to find these objects, that would defy nuclear theory as we know it, all through the XX century. Finally, in this XXI century two signals of a possible tetraneutron state close to threshold were obtained, first at GANIL and then at RIKEN, that were weak but have not been contested yet. They have triggered a lot of new theoretical calculations, as well as new generation experiments that try to reveal something that has eluded firm evidence for sixty years already. I will review some of the most exotic experiments, highlight their merits and drawbacks, and show why the present ones think they will succeed where so many others have failed. The game might be over soon, whatever the outcome.
View presentationMiguel Marqués , LPC-Caen
Miguel Marqués made his PhD between GANIL-Caen and IFIC-Valencia on “Bose-Einstein correlations between hard photons produced in heavy-ion collisions”. In 1994 he moved to LPC-Caen to work in a completely different field, the structure of exotic nuclei, and joined the CNRS one year later. Most of his research is focused on the study of correlations and research of new phenomena in very neutron-rich light nuclei. In doing so he has explored the application of original techniques, such as neutron interferometry, proton radiative capture, beta-delayed neutron emission, observation of multi-neutron resonances, or the detection of neutron clusters. Since 2012 most of his experimental activity takes place at RIKEN, and he is presently involved in the extension of the NEBULA multineutron array.
The optical potential is a crucial ingredient in modeling nuclear reactions. However, it is still the main contributor to theoretical uncertainties in calculations of reaction cross sections. It is essential that these uncertainties be reduced, especially when considering reactions involving isotopes far from stability. We combine the Bayesian Markov Chain Monte Carlo framework with the optical model to determine posterior distributions of the optical potential parameters. We then make use of different statistical tools to explore what can be learned from reaction and total cross sections, elastic scattering angular distributions and polarization data. We finally discuss the opportunities that Bayesian experimental design offers for the future.
Filomena Nunes FRIB Theory Alliance Managing Director, Michigan State University
Education and Training
Instituto Superior Tecnico, Physics Engineering, 1987/88-1991/92
University of Surrey, PhD in Theoretical Nuclear Physics, 1992/93 1994/95
Research and Professional Experience
Managing Director of FRIB Theory Alliance (2015 - )
Full Professor, Department of Physics and Astronomy and NSCL, MSU (2013 - )
Head of Department of Theoretical Nuclear Science at NSCL (2010 – 2016)
Associate Professor, Department of Physics and Astronomy and NSCL, MSU (2009 – 2013)
Assistant Professor, Department of Physics and Astronomy and NSCL, MSU (2003 – 2009) Assistant Professor, Physics Department, Instituto Superior Tecnico (IST) (1999 – 2004) Associate Professor, Universidade Fernando Pessoa, Portugal (1998 – 2003)
Research fellow, CENTRA (Centre for Astrophysics), IST, Portugal (1996 – 1998)
Research fellow, University of Surrey, England (1995 – 1996)
A new direct measurement of the 12C+12C fusion reaction has been performed down to the energy regime relevant to carbon burning in massive stars by the STELLA collaboration [1]. Direct techniques to measure fusion cross sections for astrophysics will be presented as well as specificities of the STELLA setup and the analysis techniques used for background reduction. Fusion cross section results will be presented which span over eight orders of magnitude, and the corresponding S factors will be discussed.
[1] G. Fruet, S. Courtin, M. Heine, D.G. Jenkins et al, Phys. Rev. Lett. 124, 192701 (2020).
Sandrine Courtin professor, University of Strasbourg
Sandrine Courtin is a professor of Physics at the University of Strasbourg and IPHC CNRS Laboratory in Strasbourg (France). She is a former Fellow of the University of Strasbourg Institute of Advanced Physics. Her current research focusses on nuclear reactions below the Coulomb barrier in systems of Astrophysics interest. She is the spokesperson of the STELLA (Stellar Laboratory) experiment, which is currently installed at the Andromede facility in Orsay. She has been leading experimental projects on nuclear molecules, fusion and transfer reactions at European and North-American facilities.
The region of the nuclear chart corresponding to light radioactive nuclei has, over the years, yielded many surprising results, among others the discovery of the halo structure in neutron and proton dripline nuclei.
We have performed a systematic investigation of the reaction studies around the Coulomb barrier of collisions induced by neutron halo beams and, recently, of the proton halo 8B beam. In this talk an overview of the most relevant results that have been obtained so far will be given highlighting the differences in the reaction process between neutron and proton halos.
Alessia Di Pietro Professor, Laboratori Nazionali del Sud (LNS) in Catania
Alessia Di Pietro got her PhD degree at the University of Catania in 1996. After the degree she spent about one year as post-doc at the radioactive beam facility CRC in Louvain la Neuve (Belgium) and then she was research-fellow at the University of Edinburgh (three years from 1997 to 1999). In January 2000 she became permanent research staff of INFN at the Laboratori Nazionali del Sud (LNS) in Catania, where, from 2009 she is a senior research scientist. In 2013 she got the national habilitation as full professor for the Italian University system. Her main research field is the study of effects of nuclear structure, in particular of the halo-structure, on the various reaction processes at energies around the Coulomb barrier. Within this research field she has proposed experiments in various laboratories: CRC-Louvain La Neuve, INFN-LNS, Isolde and TRIUMF. She was a member of the INTC committee (Isolde/n-TOF) and at present she is associate editor of the European Physical Journal A.
Fission of atomic nuclei is often affected by quantum effects leading to asymmetric mass splits. Quantum shells stabilising fission fragments with various shapes have been invoked as a factor determining the distribution of nucleons between the fragments at scission. While spherical shell effects in 132Sn are responsible for the symmetric fission mode in neutron rich fermiums, octupole shell effects have been invoked to explain the fact that the centroid of the heavy fragment charge distribution is found around Z=54 in actinide asymmetric fission. Shell effects have also been recently identified, both theoretically and experimentally, in the quasifission process. Quasifission occurs in fully damped heavy-ion collisions following a significant mass transfer from the heavy to the light fragment, without formation of a compound nucleus. In this talk, we use time-dependent mean-field approaches to investigate and compare the shell effects affecting the fragments formation in both fission and quasifission. In particular, we discuss the possibility to use quasifission to study fission modes in superheavy nuclei, which would benefit from the fact that quasifission cross-sections are much larger than for fusion-fission.
Cédric Simenel Professor, The Australian National University
Cedric Simenel is professor at the Australian National University (ANU) where he is mostly working on microscopic approaches to nuclear structure and dynamics, with a strong connection to experimental nuclear reaction studies. He did his PhD in GANIL (France) and graduated in 2003. After 10 years at the CEA-Saclay, he joined the ANU in 2013, where he is now Head of the Department of Theoretical Physics, and Deputy Director of the Centre of Excellence for Dark Matter Particle Physics funded by the Australian Research Council.
One-neutron knockout reactions have been extensively used to probe nuclei away from stability. Surprisingly, the ratio between experimental data and theoretical predictions of one-nucleon knockout is strongly dependent on the binding energy of the knocked-out nucleon, feature that is not observed in the analysis of other reactions. Knockout observables are usually computed at the standard eikonal model, which relies on the adiabatic approximation and therefore does not include the collision dynamics. In the first part of this talk, I will present a sensitivity analysis of one-neutron knockout observables to the nuclear-structure of the projectile, with the aim of determining the physics probed through these reactions. We have started this study on the loosely-bound halo nuclei 11Be and 15C before proceeding towards more strongly-bound nuclear systems. The second part of the talk will focus on dynamical effects in one-neutron knockout reactions. To do so, I will present the application of the Eikonal Reaction Theory (ERT) to the Dynamical Eikonal Approximation and discuss its accuracy for diffractive-breakup observables. The ERT, developed by the Kyushu-Osaka group, aims to include dynamical effects to the core-target interaction, while keeping the simplicity of the Hussein and McVoy formalism.
This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under the FRIB Theory Alliance award DE-SC0013617.
Chloë Hebborn Visiting Assistant Professor, Michigan State University
Chloë Hebborn started as a FRIB Theory Fellow at Lawrence Livermore National Laboratory in October 2020, just after she graduated. She began a PhD in October 2016, under the supervision of Pierre Capel at the Universite libre de Bruxelles. She spent the first two years visiting Johannes Gutenberg-Universitat Mainz in Germany. Her PhD work focused on improving the eikonal modelization of nuclear reactions involving exotic nuclei.
We analyse the origin of the unexpected deep sub-barrier heavy-ion fusion hindrance in 64Ni+100Mo, 64Ni+64Ni and 28Si+64$Ni reactions, and so on. Our analysis is based on the improved coupled-channels description, implemented by means of the finite element method. With the aid of the Woods-Saxon potential, we found that the account on the non-diagonal matrix elements of the coupling matrix, traditionally neglected in the conventional coupled-channels approaches in setting the left boundary conditions inside the potential pocket, and its minimal value are crucially important for the interpretation of experimental data. This finding provides the efficient way of the microscopic description of the deep sub-barrier hindrance of heavy-ion reactions, which is confirmed by a good agreement with the general trend of the experimental data for the S-factor.
View presentationPeiwei Wen Associate Researcher, China Institute of Atomic Energy
Peiwei Wen earned a Ph.D. degree in 2017 from Beijing Normal University, and then worked as a postdoc at China Institute of Atomic Energy (CIAE), Beijing, China. During 2018-2020, he visited Bogoliubov Laboratory of Theoretical Physics in Joint Institute for Nuclear Research, Dubna, Russian. Now he is working as an associate researcher at CIAE focusing on the theoretical study of the multinucleon transfer reaction and fusion reaction.
The atomic mass table presents zones where the structure of the states changes rapidly as a function of the neutron or proton number. The observed fundamental phenomena can be understood in terms of either shape coexistence or quantum phase transitions. I will try to show that two-neutron transfer intensities between the 0+ states in the parent and daughter nuclei can be used as an observable that can distinguish between the two situations. Using as structure framework for this study the Interacting Boson Model (IBM), including its version with configuration mixing (IBM-CM), we discuss the cases of the isotopic chains in Zirconium, Platinum and Samarium.
(*) In collaboration with Jose’ Enrique Garcia Ramos, Jose’ Arias, Juan Antonio Lay and Lorenzo Fortunato
Andrea Vitturi Honorary professor, University of Padova
Doctor in Physics (summa cum laude) at the University of Padova in 1972.
Post-doc in Padova since 1973. Research associate at the Niels Bohr Institute, Copenhagen, from 1977 to 1980. Staff member in Padova since 1980. Associate professor in nuclear physics at the University of Trento since 1988 and in Padova since 1991. Full professor in nuclear physics at the University of Padova since 2001. Honorary professor since 2019.
Research periods at ICTP, at the Universities of Munich and Seville, at Oak Ridge Laboratory, at CNEA in Buenos Aires, at ECT* in Trento e INT in Seattle. Visiting professor for the full academic year 2005/2006 at University of Sevilla.
Professeur Invitee' at the University of Paris VI, Orsay, in 2011.
Foreign Researcher at UFF, Niteroi, Rio de Janeiro, within the SCIENCE WITHOUT BORDERS PROGRAM, 2014-2016. Visiting professor in Tsukuba, 2017
Former Chairman of the PAC of LNL, former member of the PAC of LNS, presnt member of the PAC of RIKEN. Organizer of workshops and schools, including the ones in Varenna, Erice, ECT*, Padova and Fiera di Primiero.
Author (and co-author) of more than 200 papers on refereed intenational journals.
For light stable nuclei with small N/Z asymmetry, the existence of the magic numbers can be well explained by the traditional shell model. However, with increasing N/Z ratios, unusual rearrangements of single-particle orbitals emerge in the exotic nuclei far from the beta-stability line. The so-called s-wave intruder and d-wave intruder components have been quantitatively determined for the ground state of N=8 neutron-rich isotopes, except for 13B. In our work, the relative spectroscopic factors associated with the 13Bg.s. configuration were determined through the measurements of a single-neutron transfer reaction to the known 12B states. The s- and d-wave intruder strengths in 13Bg.s. are deduced quantitatively, and discussed systematically with N = 8 neutron-rich isotones. In the analysis of single-proton transfer reaction, three peaks were observed clearly in the excitation energy spectrum of 12Be, which are populated in the (d, 3He) reaction. Angular distributions of these three peaks show the Δ𝐿 = 1 character, which implies that the valence proton in 13B mainly occupies 𝑝 orbital. Besides, a resonant state around 4.8 MeV is observed, and the spin-parity of this resonant is tentatively assigned.
View presentationWei Liu PhD student, Peking University
Liu Wei is a 5th year PhD student at the State Key Laboratory of Nuclear Physics and Technology, Peking University (PKU).
The application of nuclear reactions is not limited to energy supply, but extends to a wide range of fields including medicine. For the design study of facilities such as nuclear reactor, accelerator and so on, accurate and comprehensive database of nuclear reaction cross sections are indispensable. However, it is difficult to develop comprehensive nuclear database based on experimental data alone. Hence, reliable theoretical model calculations play key roles in completing the necessary cross-section data by interpolating or extrapolating experimental ones. This talk will outline the calculation methods employed in the development of the series of Japanese Evaluated Nuclear Data Library (JENDL). Through the talk, the importance of theoretical studies on nuclear reactions in the engineering fields will also be mentioned.
Shinsuke Nakayama research engineer staff, Nuclear Data Center, Japan Atomic Energy Agency (JAEA)
Shinsuke Nakayama is now a research engineer staff at Nuclear Data Center, Japan Atomic Energy Agency (JAEA). He obtained his PhD at Kyushu University in 2015. Since then, he has been working in his current affiliation. He works on the development of Japanese Evaluated Nuclear Data Library (JENDL), which is the database of nuclear reaction cross sections made in Japan. His work extends also to the development of calculation methods employed in the nuclear data evaluation of JENDL.
Nuclei far away from the valley of stability are actively studied at experimental and theoretical levels. Due to their small nucleon separation energies, nuclei at drip-lines can present halos in the asymptotic region and nuclear states can be unbound with respect to particle emission.
A nuclear model able to treat drip-line nuclei consistently is the Gamow Shell model (GSM). GSM is a configuration interaction model based on the use of the one-body Berggren basis, which contains bound, resonance and scattering states. Inter-nucleon correlations are taken into account via the use of configuration mixing, so that both structure and reaction degrees of freedom are included in GSM.
We will firstly present applications of GSM concerning the spectra of light nuclei. GSM has also been extended to the study of reaction observables. Scattering and radiative capture cross sections of light nuclei involving nucleon and deuteron projectiles will be presented for that matter. In particular, the important topic of transfer (d,p) reactions will be discussed.
Nicolas Michel Professor, Institute of Modern Physics (Lanzhou)
1999-2002: Ph.D. in nuclear physics in GANIL (Caen, France) under the direction of Prof. Marek Ploszajczak Title: Description of weakly bound nuclei with the Shell Model Embedded in the Continuum
2003-2006: Research associate in University of Tennessee in Knoxville - ORNL in the group of Prof. Witek Nazarewicz
2006-2008: JSPS Fellowship at Kyoto University (Japan) in the group of Prof. Kenichi Matsuyanagi
2008-2009: Research engineer at CEA-Saclay (France)
2009-2011: Senior researcher at the University of Jyväskylä in the group of Prof. Jacek Dobaczewski
2011-2013: Research associate in University of Tennessee in Knoxville - ORNL in the group of Prof. Witek Nazarewicz
2013: Research associate in Michigan State University (MSU) in the group of Prof. Morten Hjorth-Jensen
2013-2015: Research associate in GANIL in the group of Prof. Marek Ploszajczak
2016-2018: Visiting associate professor in MSU in the group of Prof. Witek Nazarewicz
2019-2023: Professor in nuclear theory in Institute of Modern Physics (Lanzhou) in the group of Prof. Wei Zuo
Arriving at a predictive modeling of big-bang nucleosynthesis and stellar interiors relies on having a robust understanding of the nuclear reactions that are essential building blocks of such processes. First-principles calculations have made great strides during the past years in bridging the gap from fundamental nucleon-nucleon and three-nucleon interactions derived from chiral effective field theory to the description of nuclear structure and dynamics. In this talk I will outline the basic principles of the no-core shell model with continuum, an ab initio approach aimed at describing the interface between structure and dynamics in nuclei, and discuss recent efforts in extending its applicability to α-induced reactions, as well as ongoing efforts for quantifying the uncertainties arising from chiral effective field theory to nuclear reaction predictions.
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. Lawrence Livermore National Security, LLC
Kostas Kravvaris Postdoc, Lawrence Livermore National Laboratory
Kostas graduated from the National Kapodestrian University of Athens in 2011 with a specialization in Condensed Matter Physics. Earned a Master's Degree in 2014 and a PhD in 2018, both from Florida State University, studying α-clustering in light nuclei. Currently he works at Lawrence Livermore National Laboratory, in the Nuclear Data and Theory Group, working on first-principles reaction theory.
In the continuum-discretized coupled-channel method (CDCC), a breakup cross section (BUX) is obtained as an admixture of several components of different channels in multichannel scattering. For example, for 6Li scattering in four-body CDCC (n+p+α+T, where T is a target), the resultant three-body BUX (6Li+T→d+α+T) and the four-body BUX (6Li+T→n+p+α+T) are mixed because of the discretization of the projectile wave functions. In principle, it is possible to disentangle the cross section into three-body and four-body channel components if the exact three-body wave functions are prepared under the proper boundary condition. However, performing that calculation is hard and impractical. In this talk, we propose a practical method for decomposing discretized BUXs into components of each channel. This approximation is referred to as the “probability separation (P separation).” As an example, we consider 11Be scattering by using the three-body model with core excitation (10Be+n+T) because this scattering provides an analogy to the 6Li scattering regarding the mixture of different channels [core-ground channel (11Be+T→10Be(g.s.)+n+T) and core-excited channel (11Be+T→10Be*+n+T)]. The structural part is constructed by the particle-rotor model and the reaction part is described by the distorted-wave Born approximation. We show the validity of the P separation by comparing it with the exact solution. Finally, we apply the P separation to 6Li four-body scattering and discuss the reaction dynamics beyond simple three-body dynamics.
View presentationShin Watanabe Lecturer, National Institute of Technology, Gifu College (Japan)
Shin Watanabe is a lecturer at National Institute of Technology, Gifu College (Japan). He got his Ph.D. at Kyushu University in 2016 and worked for RIKEN Nishina center for a year as a postdoc. His research interest is the dynamics of multi-channel breakup reactions using few-body models such as the continuum-discretized coupled-channels method (CDCC).
The 9C nucleus and its related capture reaction, 8B(p,γ)9C, have been intensively studied with an astrophysical interest. Due to the weakly-bound nature of 9C, its structure is likely to be described as the three-body (7Be+p+p), which has, however, not been described so far. It's continuum structure is also important to describe reaction processes of 9C, with which the reaction rate of the 8B(p,γ)9C process has been extracted indirectly. In this talk, I will discuss our recent and first three-body results on the ground and low-lying continuum states of 9C [arXiv:2103.09511 [nucl-th]]. The three-body ground and low-lying continuum states of 9C are built within the framework of Gaussian-expansion method (GEM) combined with the complex-scaling method (CSM). Role of the low-lying resonances will be discussed in the breakup of 9C by means of four-body (7Be+p+p+target) version of the continuum-discretized coupled-channels (CDCC) method.
Jagjit Singh Research Associate, Osaka University
Jagjit Singh is working as a Research Associate at Research centre for Nuclear Physics (RCNP), Osaka University, Japan in the group of Prof. K. Ogata and a visiting researcher at Akal University, Punjab, India. He has completed his PhD from the University of Padova, Italy under supervision of Prof. L. Fortunato and Prof. A. Vitturi. He has worked as a Research Associate at Indian Institute of Technology(IIT), Roorkee, India in group of Prof. R. Chatterjee for a few months, followed by two and half year postdoctoral fellowship at Nuclear Reaction data center (JCPRG) and Theoretical Nuclear Physics Laboratory (TNPL) at Hokkaido University Sapporo, Japan. During his stay at Hokkaido he worked in collaboration with Dr. W. Horiuchi. His major research interests are the theoretical investigation of the structure and reaction studies of the nuclei lying away from the valley of stability using few-body approaches. Recently he is involved in the three-body structure investigation for various Borromean nuclei and three/four-body breakup reaction studies using continuum-discretized coupled-channels method (CDCC). His research interests also include nuclear reaction data compilation and evaluation activity.
As schematically described in the Ikeda diagram [1], the alpha clustering is expected in light nuclei, near the alpha threshold energies in particular. Both theoretical and experimental efforts have been made over decades, and such alpha clustering phenomena are well understood in the light mass region. In contrast, the alpha clustering in the ground state is not well understood so far. An alpha-16O component in the 20Ne ground state is one of the candidates of the alpha clustering in the ground state, owing to the double magic nature of the 16O core. Carey et al. [2] performed the 20Ne(p,p alpha)16O reaction experiment and reported that the alpha spectroscopic factor of the alpha-16O component extracted from the reaction analysis is inconsistent with a theoretical prediction by about a factor of two. In Ref.[3] we have re-analyzed the knockout cross section data with a modern theoretical framework, a combination of the antisymmetrized molecular dynamics and the distorted wave impulse approximation. We confirmed that the inconsistency between the theory and the experimental result has resolved thanks to the quantitative improvement of the present framework. In this seminar, I will introduce recent achievements of reaction theory for the alpha knockout reaction, mainly on the knockout reaction from 20Ne and 16O, and challenges toward the heavier region, 48Ti [4] and Sn isotopes [5].
[1] K. Ikeda, N. Takigawa, and H. Horiuchi, Prog. of Theor. Phys. Suppl. E68 (1968) 464.
[2] T. A. Carey et al., Phys. Rev. C. 29, 1273 (1984).
[3] K. Yoshida, Y. Chiba, M. Kimura, Y. Taniguchi, Y. Kanada-En'yo, and K. Ogata, Phys. Rev. C 100, 044601 (2019).
[4] Y. Taniguchi, K. Yoshida, Y. Chiba, Y. Kanada-En'yo, M. Kimura and K. Ogata, arXiv:2101:04820.
[5] J. Tanaka et al., Science 371, 260 (2021).
Kazuki Yoshida postdoc, Osaka University
I am a postdoctoral researcher at Japan Atomic Energy Agency since Apr. 2018 after obtaining my Ph.D. at the Research Center for Nuclear Physics, Osaka University, Japan. My research interest is the nucleon and alpha knockout reaction as a probe for the single-particle and cluster aspects of nuclei.
Dineutron is a strong spatial neutron-neutron correlation which could appear on the surface of nuclei, although it is still elusive in terms of experiments. Recently, evidence of dineutron correlations have been shown for neutron halo nuclei, using different techniques: 1) Coulomb breakup of 19B, 6He [1,2], and 2) proton quasi-free scattering of 11Li [3]. I will also show a promising method of 3) direct two-neutron decay of resonance states along the neutron drip line, where I show the preliminary result on the decay of the 1st excited state of 6He. I also discuss the relevance of the dineutron correlation to other quantum hierarchies, such as atomic systems.
[1] K.J. Cook, T.Nakamura et al., Phys. Rev. Lett. 124, 212503 (2020).
[2] Y.L. Sun, T. Nakamura et al., Phys. Lett. B814, 136072 (2021).
[3] Y. Kubota, et al., Phys. Rev. Lett. 125, 252501 (2020).
Takashi Nakamura Professor, Tokyo Institute of Technology
Educational History
• 1984-1986, Scinence-I, University of Tokyo
• 1986-1988, Departmenf of Physics, University of Tokyo
• 1988-1990, Department of Physics, Graduate School of Science (Master Course), University of Tokyo
• 1990 Master Degree (Univ. of Tokyo)
• 1990-1993, Department of Physics, Graduate School of Science (Docter Course), Uni- versity of Tokyo
• 1996 Doctor of Science obtained (Univ. of Tokyo) Thesis: Coulomb Excitation of 11Be Supervisor: Prof.M.Ishihara
Employment
• 1993-1995, Special Postdoctoral Researcher, RIKEN
• 1995-2000, Research Associate, Department of Physics, University of Tokyo
• 1998-2000, Visiting Scientist, National Superconducting Cyclotron Laboratory, Michi- gan State University
• 2000-2008, Associate Professor, Department of Physics, Tokyo Institute of Technol- ogy
• 2008-Present, Professor, Department of Physics, Tokyo Institute of Technology
• FY 2013, Head of Department
• FY 2015, Head of Department
• FY 2018-2019, Member, Educational Research Council
• FY 2021, Head of Department
The three-nucleon (3N) force is important for understanding the structure and dynamics of atomic nuclei and nuclear matter from first principles and it is routinely used in many ab-initio structure calculations. It is also included in calculations describing reactions involving nuclei that can be modelled as few-body systems. First calculations of elastic scattering with ab-initio potentials have also been recently reporter. However, 3N force is not considered in analyses of experimental data involving direct reactions with complex nuclei. One particular class of such reactions, deuteron stripping (d,p) and pick-up (p,d), is an important experimental tool for testing the shell-model picture of atomic nuclei, which is often used for indirect determination of nucleon capture reaction rates at astrophysical energies. In this talk I will describe recent advances in clarifying the role of the 3N force in (d,p) reactions.
View presentationNatalia Timofeyuk , University of Surrey
I work at the University of Surrey. Previous places of work are Université Libre de Bruxelles and Institute of Nuclear Physics of the Academy of Science of Uzbekistan.