Nuclear physics with RI Beam Factory

Sakuraï, H.

doi:10.1007/s11467-018-0849-0

Cited by 17 publications

(6 citation statements)

References 138 publications

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“…The production of neutron-rich superheavy nuclei in the island is highly desired, as it would provide a new stringent constraint for microscopic theories. Therefore, the study of MNT reactions is listed as one of the key subjects at the current and future RI beam facilities, such as RIBF (RIKEN, Japan) [10], HIRFL-CSR and HIAF (IMP, China) [11], RAON (RISP, Korea) [12], DRIB (FLNR, Russia), SPIRAL2 (GANIL, France) [13], FAIR (GSI, Germany) [14], SPES (INFN, Italy) [15], FRIB (MSU, USA) [16], and so on.…”

Section: Introductionmentioning

confidence: 99%

TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: A Mini Review

Sekizawa

2019

Front. Phys.

106

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Time-dependent Hartree-Fock (TDHF) theory has been a powerful tool in describing a variety of complex nuclear dynamics microscopically without empirical parameters. In this contribution, recent advances in nuclear dynamics studies with TDHF and its extensions are briefly reviewed, along the line with the study of multinucleon transfer (MNT) reactions. The latter lies at the core of this Research Topic, whose application for production of extremely neutron-rich nuclei has been extensively discussed in recent years. Having in mind the ongoing theoretical developments, it is envisaged how microscopic theories may contribute to the future MNT study. 1 Here a local EDF (like Skyrme) has been assumed, which makes the TDHF equations (1) local in space, as it is currently used in most of practical applications. In general, E = E(r)dr is composed of various local densities, ξ ≡ {ρ, τ, . . . }, and the TDHF equations (1)In such a case, the single-particle Hamiltonian can have spin dependence as well as differential operators (for the explicit form, see, e.g., Refs. [27][28][29]).

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Section: Introductionmentioning

confidence: 99%

TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: A Mini Review

Sekizawa

2019

Front. Phys.

106

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“…The highdensity symmetry energy is related to the issues of compact stars, such as the phase transition, binary neutron star merging, tidal deformation etc [17][18][19][20][21][22], which is still not well understood up to now. To extracting the density dependence of symmetry energy, new experiments are being carried out at the facility in the world, such as Radioactive Isotope Beam Facility (RIBF) in Japan [23], Facility for Rare Isotope Beams (FRIB) in the USA [24], the Cooling Storage Ring (CSR) and the High Intensity Accelerator Facility (HIAF) in China [25].…”

Section: Introductionmentioning

confidence: 99%

Extracting the high-density symmetry energy and pion production in heavy-ion collisions

Heng-Jin¹,

Cheng²,

Zhu³

2023

Preprint

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Within the framework of the quantum molecular dynamics transport model, the pion production and isospin effect in heavy-ion collisions have been thoroughly investigated. The energy conservation in the decay of ∆ and reabsorption of pion in nuclear medium are taken into account. The influence of the stiffness of symmetry energy and the pion potential on the pion production are systematically investigated and compared with the FOPI data via the transverse momentum, longitudinal rapidity and collective flow in collisions of 197 Au + 197 Au. It is manifested that the pion yields are slightly suppressed in the domain of mid-rapidity and high momentum. The antiflow phenomena is reduced by implementing the pion potential and more consistent with the experimental data. The isospin diffusion in the high-density region (1.2ρ0 -1.8ρ0) is investigated by analyzing the neutron/proton and π − /π + ratios in the reaction of 132 Sn + 124 Sn at the incident energy of 270 MeV/nucleon. A soft symmetry energy with the slope parameter of L(ρ0) = 42 ± 25 MeV is obtained by analyzing the experimental data from the SπRIT collaboration.

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“…The production of neutron-rich superheavy nuclei in the predicted island of stability (Z = 114, 120, or 126, N = 184) is highly desired [34,35], because, in addition to fundamental interest in nuclear structures such as shell evolution [36] and shape transitions [37,38], it would provide a new stringent constraint for microscopic theories. The investigation of MNT processes is an important project at current and future RIB facilities such as RIBF (RIKEN, Japan) [39], HIRFL-CSR and HIAF (IMP, China) [40], RAON (RISP, Korea) [41], DRIB (FLNR, Russia), SPIRAL2 (GANIL, France) [42], FAIR (GSI, Germany) [43], SPES (INFN, Italy) [44], and FRIB (MSU, USA) [45], and so forth. It is important to provide a reliable prediction of the optimum reaction condition, such as projectile-target combinations and collision energies, to guide experiments to terra incognita.…”

Section: Introductionmentioning

confidence: 99%

Reaction mechanism study for multinucleon transfer processes in collisions of spherical and deformed nuclei at energies near and above the Coulomb barrier: The $^{16}$O+$^{154}$Sm reaction

Roy,

Santra,

Pal

et al. 2021

Preprint

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Background: Multinucleon transfer reactions at energies around the Coulomb barrier offer a vital opportunity to study rich physics of nuclear structure and dynamics, e.g., single-particle level structure and quantum shells, mass/charge equilibration processes, energy dissipation, as well as secondary decays via particle emission or fission. Despite the continuous development in the field, we have still limited knowledge about how deformation-one of the representative nuclear structures-affects multinucleon transfer reactions.Purpose: To shed light on the effect of deformation in multinucleon transfer processes, we study the 16 O+ 154 Sm reaction at E lab = 85 MeV (around the Coulomb barrier) and 134 MeV (substantially above the Coulomb barrier), where the target nucleus, 154 Sm, is a well-established, deformed nucleus. Methods:We have performed experiments on the 16 O+ 154 Sm reaction at the BARC-TIFR pelletron-Linac accelerator facility, Mumbai, India, measuring angular distributions for various transfer products. The measured cross sections have been analyzed along with theoretical calculations based on the time-dependent Hartree-Fock (TDHF) theory, together with a statistical model for secondary deexcitation processes, GEMINI++.Results: Angular distributions for elastic scattering and for various transfer channels were measured over a wide angular range. The Q-valueand angle-integrated isotope production cross sections have been extracted from the measured angular distributions. We have successfully obtained production cross sections for various isotopes for E lab = 85 MeV, while only for four isotopes could be deduced for E lab = 134 MeV due to present experimental limitations. For the lower incident energy case, we find a reasonable agreement between the measurements and the TDHF calculations for a-few-nucleon transfer channels; whereas TDHF underestimates cross sections for many-nucleon transfers, consistent with earlier works. On the other side, we find that calculated cross sections for secondary reaction products for the higher incident energy case, qualitatively explains the measured trends of isotopic distributions observed for the lower energy. The latter observation indicates possible underestimation of excitation energies in the present TDHF+GEMINI analysis. Although certain orientation effects were observed in TDHF results, it is difficult to disentangle them from the Q-valueand angle-integrated production cross sections. Conclusions:The present analysis showed that the orientation effect in multinucleon transfer processes in the 16 O+ 154 Sm reaction is rather weak at least for the two incident energies examined. Further systematic investigations with carefully changing projectile-target combinations and collision energies, including subbarrier regime, would be required to fully uncover the effects of nuclear deformation on multinucleon transfer processes in low-energy heavy-ion reactions.

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Nuclear physics with RI Beam Factory

Cited by 17 publications

References 138 publications

TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: A Mini Review

TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: A Mini Review

Extracting the high-density symmetry energy and pion production in heavy-ion collisions

Reaction mechanism study for multinucleon transfer processes in collisions of spherical and deformed nuclei at energies near and above the Coulomb barrier: The $^{16}$O+$^{154}$Sm reaction

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