Article
Physics, Nuclear
B. Mukeru, Lauro Tomio
Summary: In this study, we investigate the breakup dynamics of beryllium-11 on a lead-208 target using the continuum discretized coupled-channel formalism. Our results suggest that the continuum-continuum couplings in nuclear breakup are much stronger than in Coulomb breakup, indicating that the nuclear contribution dominates the total breakup. The diagonal monopole nuclear potential in the projectile-target center-of-mass has negligible effect on the total and nuclear breakup cross-sections.
Article
Physics, Nuclear
Xiang-Xiang Sun, Lu Guo
Summary: We conducted a microscopic study on the fusion reactions 14,15C + 232Th, focusing on the influence of deformed halo structure on reaction dynamics using the time-dependent density functional theory. By obtaining internuclear potentials through the density-constraint frozen Hartree-Fock approach, we calculated the fusion cross sections of 14,15C + 232Th considering all orientations of deformed reactants. Our calculations successfully reproduced the enhancement of fusion cross sections at sub-barrier energies and provided insights into the underlying mechanism driven by the deformed halo structure of 15C. Additionally, we found that the one-neutron transfer probabilities were more sensitive to the orientations of 15C than 232Th, indicating the notable effects of halo structure on the reaction dynamics.
Article
Physics, Nuclear
Ki-Seok Choi, K. S. Kim, Myung-Ki Cheoun, W. Y. So, K. Hagino
Summary: The study focuses on the role of deformation of the target nucleus in fusion reactions of the C-15+Th-232 system near the Coulomb barrier; Potential between C-15 and Th-232 is calculated using the double folding procedure, taking into account the structure of the projectile nucleus and coupling to the one-neutron transfer process; The results indicate the significant role of transfer coupling in fusion reactions of neutron-rich nuclei.
Article
Astronomy & Astrophysics
Thomas Faestermann, Andreas Bergmaier, Roman Gernhaeuser, Dominik Koll, Mahmoud Mahgoub
Summary: In this study, the reaction Li-7(Li-7,C-10) was used to populate states in the tetraneutron. A peak in the energy spectrum of identified C-10, which could not be attributed to a reaction with any other target components, was found to correspond to an excitation energy of 2.93 +/- 0.16MeV in the C-10+4n system. A similar peak was observed under different kinematic conditions. Analysis suggests that this peak is more likely to correspond to the first excited state of C-10 at 3.354MeV and a tetraneutron with a binding energy of +0.42 +/- 0.16MeV.
Article
Physics, Nuclear
B. Mukeru, M. B. Mahatikele, G. J. Rampho
Summary: In this paper, we investigated the effects of three-body interactions in weakly bound neutron-rich nuclei by studying their ground-state properties. We considered these nuclei as two-neutron halo systems with different core atomic masses and degrees of stability. Our findings suggest that the strength of the three-body potential required to bind the halo nucleus decreases as the atomic mass increases. We speculate that the effects of three-body interactions may be negligible when the core is weakly bound.
Article
Physics, Nuclear
Piyasi Biswas, A. Mukherjee, Saikat Bhattacharjee, D. Chattopadhyay, Subinit Roy, S. Santra, S. K. Pandit, K. Ramachandran, K. Mahata, A. Shrivastava
Summary: The excitation function for quasielastic scattering of weakly bound projectile Li-6 on a Tb-159 target at large backward angle has been measured, and the quasielastic barrier distribution has been extracted. The centroid of the quasielastic barrier distribution, including alpha particles, is found to shift towards higher energy relative to the fusion barrier distribution for the system. This shift is attributed to the low alpha-breakup threshold of the Li-6 nucleus.
Article
Physics, Nuclear
Chetna, Md Moin Shaikh, Pardeep Singh, Rajesh Kharab
Summary: In this study, the fusion excitation functions of reactions induced by Be-9 on various heavy mass targets were investigated using the Continuum Discretized Coupled Channel (CDCC) approach. The proper accounting of the inconsistency in the definitions of theoretical and experimental fusion cross section resulted in a fair agreement between data and predictions, except for Tungsten.
Article
Physics, Nuclear
M. Shariq Asnain, Mohd Shuaib, Ishfaq Majeed, Manoj Kumar Sharma, Vijay R. Sharma, Abhishek Yadav, Devendra P. Singh, Pushpendra P. Singh, Sushil Kumar, R. Kumar, B. P. Singh, R. Prasad
Summary: The present work investigates the effects of projectile breakup on fusion cross section and compares experimental data of different strongly bound projectiles, revealing an exponential relation between the breakup threshold and suppression factor.
Article
Astronomy & Astrophysics
P. Capel, D. R. Phillips, H-W Hammer
Summary: In this study, the breakup of Be-11 was calculated using Halo Effective Field Theory and the Dynamical Eikonal Approximation, with the inclusion of an effective Be-10-n-target force. The results show an improved description of neutron-energy and angular spectra on a C-12 target, especially near the Be-11 5/2(+) state. By adjusting the range parameters of the three-body force, a reasonable description of data in the region of the 3/2(+) Be-11 state was also achieved, demonstrating the sensitivity of the overlap integral structure governing Be-11 s-to-d-state transitions induced by the three-body force.
Article
Engineering, Biomedical
Bleddyn Jones
Summary: A practical neutron energy dependent RBE model has been developed based on the relationship between mono-energetic neutron energy and its likely recoil proton energy. The model uses LET values of recoil protons to modify radiosensitivities and predict RBE values. Experimental studies suggest this model could have applications in ion beams and radioprotection.
PHYSICS IN MEDICINE AND BIOLOGY
(2021)
Article
Physics, Nuclear
Xiao-Tao He, Chen Wang, Kai-Yuan Zhang, Cai-Wan Shen
Summary: This study used relativistic calculations to investigate the possible existence of bound nuclei beyond the neutron drip lines in the transfermium region from No to Ds, and found that nuclear deformation plays a vital role in the existence of these bound nuclei.
Article
Astronomy & Astrophysics
S. K. Pandit, A. Shrivastava, K. Mahata, N. Keeley, V. V. Parkar, R. Palit, P. C. Rout, K. Ramachandran, A. Kumar, S. Bhattacharyya, V. Nanal, S. Biswas, S. Saha, J. Sethi, P. Singh, S. Kailas
Summary: The study investigates the origin of large alpha particle production and incomplete fusion in reactions involving weakly bound alpha+x cluster nuclei. By measuring the correlation between outgoing alpha particles and gamma rays from heavy residues in the Li-7(alpha+triton)+Nb-93 system, it was found that the direct cluster-stripping mechanism plays a dominant role in large alpha production.
Article
Physics, Nuclear
D. Negrea, N. Sandulescu, D. Gambacurta
Summary: This study analyzes the contribution of isovector and isoscalar proton-neutron pairing to the binding energies of even-even nuclei with N - Z = 0, 2, 4 and atomic mass 20 < A < 100. The binding energies are calculated using a mean-field approach coupled with a Skyrme-type functional and a zero-range isovector-isoscalar pairing force. The pairing force is treated in the framework of the quartet condensation model (QCM) which preserves particle number and isospin exactly. The interdependence of pairing and deformation is taken into account through self-consistent Skyrme-HF + QCM calculations in the intrinsic system. It is shown that the binding energies do not change significantly when the isoscalar pairing is activated, which can be attributed to the less attractive off-diagonal matrix elements of the isoscalar force and the competition between isoscalar and isovector pairing channels.
Article
Physics, Multidisciplinary
A. Adel, A. R. Abdulghany
Summary: Proton radioactivity and alpha-decay half-lives of neutron-deficient nuclei have been systematically studied, with a focus on the proton-nucleus interaction potential and density distributions. The study has identified new parameters, successfully reproduced experimental data and verified the applicability of the universal decay law. Experimental confirmation of theoretical calculations indicates satisfactory agreement in the research.
Article
Physics, Nuclear
Junzhe Liu, Jin Lei, Zhongzhou Ren
Summary: In this study, the validity of surface approximation for breakup reactions is examined using a fully quantum-mechanical model proposed by Ichimura, Austern, and Vincent (IAV). We introduce radial cut-offs to scattering waves in the IAV framework, referred to as IAV-cut, analogous to the semiclassical picture. Systematic calculations are performed for nonelastic breakup reactions induced by 6Li and deuterons, and a comparison between IAV and IAV-cut results is made. The agreement observed between IAV and IAV-cut in 6Li induced reactions provides validation for the semiclassical picture, while deuteron induced reactions show a strong dependence on the interior wave functions, indicated by the suppression observed in the IAV-cut results, which increases with incident energy.
Review
Physics, Multidisciplinary
Sebastian Mizera
Summary: This article discusses the mathematical properties and physical implications of scattering amplitudes, and traces these properties back to physics through simple scattering problems.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2024)