Article
Nuclear Science & Technology
H. C. Manjunatha, N. Sowmya, P. S. Damodara Gupta, K. N. Sridhar, A. M. Nagaraja, L. Seenappa, S. Alfred Cecil Raj
Summary: New decay modes were identified in superheavy nuclei, including heavy particle emission and beta-plus emitters. Observations of various decay modes, such as Kr-86 emitters and Mo-96 radioactivity, were reported in superheavy nuclei. The study serves as a reference for identifying possible decay modes in the superheavy region.
NUCLEAR SCIENCE AND TECHNIQUES
(2021)
Article
Physics, Multidisciplinary
M. Ismail, A. Y. Ellithi, A. Adel, M. A. Abbas
Summary: The study readjusted the empirical Royer formulas and examined the effects of various factors on the accuracy of the formulas using experimental data and alpha-decay half-lives. The modified formulas were tested and compared with experimental data and other theoretical calculations. The study also made predictions for the alpha-decay half-lives of superheavy nuclei isotopes and explored the stability of neutron numbers at certain values.
Article
Physics, Multidisciplinary
A. Jain, P. K. Sharma, S. K. Jain, Dashty T. Akrawy, G. Saxena
Summary: A comprehensive study was conducted on favoured and unfavoured α-decay, cluster decay, weak-decay, and spontaneous fission in undetected superheavy nuclei within the range of proton number 111 ≤ Z ≤ 118 and neutron number 161 ≤ N ≤ 192. The half-lives for these decays were accurately estimated based on NUBASE2020 and were found to closely match the known half-lives. The α-decay mode was found to be the most probable in this wide range, and potential α-decay chains were predicted. Interestingly, the possibilities of cluster emission and weak-decay were also anticipated in this region of the periodic chart, which could provide new pathways for the detection of superheavy nuclei.
Article
Physics, Nuclear
C. Morse
Summary: This article presents information on the production, identification, half-lives, and decay modes of nuclides with specific mass numbers, including recommended values. These data are vital for updating our knowledge of the region of superheavy nuclei.
NUCLEAR DATA SHEETS
(2022)
Article
Physics, Nuclear
P. Sarriguren
Summary: The competition between alpha- and beta(+) /EC-decay modes in superheavy nuclei synthesis is systematically studied. The alpha decay is found to be the dominant decay mode in most cases, but there are interesting instances where the half-lives of both modes are comparable, indicating the possibility of new pathways to more neutron-rich nuclei in this region.
Article
Physics, Multidisciplinary
Song Luo, Xiao Pan, Jian-Jun Dong, Xi-Jun Wu, Biao He, Xiao-Hua Li
Summary: Based on the liquid-drop model with shell correction, a simple alpha-decay energy formula is proposed for heavy and superheavy nuclei. The formula is fitted to experimental data of 209 nuclei and shows good agreement. Comparison with other formulae and a nuclear mass model demonstrates the superiority of the proposed formula. Additionally, the formula is extended to predict alpha-decay energies for nuclei with higher atomic numbers.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Deepika Pathak, Navdeep Singh, Pardeep Singh, Paramjit Kaur, Harjeet Kaur, Sudhir R. Jain
Summary: In this study, cluster-decay half-lives of even-even nuclei are calculated using Coulomb and proximity potentials and compared with experimental results. The required disintegration energies are evaluated using periodic-orbit theory to predict the logarithmic values of half-lives for certain nuclei. By analyzing the branching ratios, the dominant mode of decay in superheavy nuclei is determined. The results provide valuable insights for identifying exotic nuclei.
Article
Astronomy & Astrophysics
J. M. Dong, Q. Zhao, L. J. Wang, W. Zuo, J. Z. Gu
Summary: Alpha-decay plays a significant role in the development of physics and chemistry, but accurately calculating the formation probability S-alpha remains a challenge. A new multistep model was established to calculate the S-alpha values of some typical alpha-emitters, showing promising results in reproducing experimental half-lives and providing insights into nuclear structure.
Article
Physics, Multidisciplinary
O. K. Azeez, W. A. Yahya, A. A. Saeed
Summary: The α-decay half-lives of superheavy nuclei were studied using a modified Gamow-like model and improved empirical formulas. New adjustable parameters and coefficients for the formulas were obtained, and calculations showed that the Royer, DK, and AKRE formulas performed the best. Theoretical predictions also suggested that N=184 could be a possible magic number.
Article
Physics, Nuclear
G. Saxena, A. Jain
Summary: This article proposes a simple relation that estimates the half-life of cluster and alpha-decays by considering the isospin of the parent nucleus and the angular momentum taken away by the emitted particle. The improved version not only accurately predicts experimental half-lives in the trans-tin and trans-lead regions, but also explains cluster emission in superheavy nuclei.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Multidisciplinary Sciences
Hong-Qiang You, Zheng-Zhe Qu, Ren-Hang Wu, Hao-Ze Su, Xiao-Tao He
Summary: An artificial neural network model based on experimental data is developed and trained to predict alpha-decay energy. The model exhibits good predictive power and the influence of different inputs is investigated, with the shell effect and pairing effect found to improve the predictions.
Article
Physics, Nuclear
M. Droste, A. Blazhev, P. Reiter, K. Arnswald, M. Beckers, C. Fransen, R. Hetzenegger, R. Hirsch, L. Kaya, L. Knafla, L. Lewandowski, C. Mueller-Gatermann, P. Petkov, D. Rosiak, M. Seidlitz, B. Siebeck, A. Vogt, N. Warr, K. Wolf
Summary: Lifetimes and reduced transition probabilities in the ground-state band of Pd-104 were determined using the recoil distance Doppler-shift method, and excited states were populated via a fusion-evaporation reaction. The results deviate from previous evaluated values and provide new information on transition strengths for higher-lying states in the medium-mass Pd isotope chain.
Article
Physics, Nuclear
A. M. Nagaraja, H. C. Manjunatha, N. Sowmya, L. Seenappa, P. S. Damodara Gupta, N. Manjunatha, S. Alfred Cecil Raj
Summary: The concept of heavy particle radioactivity in superheavy element Z = 126 was studied using modified generalised liquid drop model (MGLDM). Different proximity functions and mass excess values were used to evaluate cluster/HPR, and logarithmic half-lives were compared with experimental results. The study also compared the HPR of Ni-60 to Ru-102 in the superheavy region and identified various HPR emitters, alpha emitters, beta(+) emitter, and spontaneous fission nuclei in different superheavy nuclei.
Article
Physics, Nuclear
Rajni, Kirandeep Sandhu, Manoj K. Sharma
Summary: The Skyrme energy density formalism is used to study the capture cross sections of superheavy nuclei. Different forces and parameters are included to calculate the cross sections of neutron evaporation, fission, and quasifission, and the mass distribution, deformations, and magic shell effects are also investigated. Finally, the kinetic energy distribution of fragments is calculated using different potentials and compared with experimental data.
Article
Physics, Multidisciplinary
K. Prathapan, P. Deneshan, M. K. Preethi Rajan, R. K. Biju
Summary: Within the framework of the Coulomb and Proximity Potential Model, the alpha decay half-lives of superheavy nuclei with various neutron numbers are systematically investigated. The predictive power of the model is verified by comparing the calculated half-lives with experimental data. The study reveals the occurrence of neutron shell closure and potential neutron magic numbers in certain isotopes.
INDIAN JOURNAL OF PHYSICS
(2023)
Article
Physics, Atomic, Molecular & Chemical
P. Jachimowicz, M. Kowal, J. Skalski
Summary: This study systematically determines ground-state and saddle-point shapes and masses for 1305 heavy and superheavy nuclei with Z = 98-126 and N = 134-192, including odd -A and odd-odd systems. Key parameters such as static fission barrier heights, separation energies, and Q(alpha) values are derived from these determinations. The research is performed within the microscopic-macroscopic method, using a deformed Woods-Saxon single-particle potential and a Yukawa-plus-exponential macroscopic energy for calculations.
ATOMIC DATA AND NUCLEAR DATA TABLES
(2021)
Article
Physics, Multidisciplinary
F. Mercier, J. Zhao, J-P Ebran, E. Khan, T. Niksic, D. Vretenar
Summary: A microscopic calculation of half-lives for the alpha and 2 alpha decays of Po-212 and Ra-224 was performed using a self-consistent framework based on energy density functionals. The calculated half-lives for the alpha decay of Po-212 and Ra-224 are in good agreement with experimental data. A new decay mode, symmetric 2 alpha emission, with half-lives similar to cluster emission, was predicted.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Z. X. Ren, D. Vretenar, T. Niksic, P. W. Zhao, J. Zhao, J. Meng
Summary: This study examines the process of nuclear fission, focusing on the formation and scission mechanism of a neck between the nascent fragments. By using time-dependent density functional theory, it is found that the assembly of two α-like clusters coincides with the formation of the neck. During scission, the neck ruptures between the two α-like clusters, and light charged clusters are formed. The findings provide insights into the mechanism of nuclear fission and its potential connection to ternary fission.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Nuclear
B. Li, D. Vretenar, Z. X. Ren, T. Niksic, J. Zhao, P. W. Zhao, J. Meng
Summary: The saddle-to-scission dynamics of induced fission process is investigated using a microscopic finite temperature model based on time-dependent nuclear density functional theory (TDDFT), which allows the tracking of local temperature evolution along the fission trajectories. By starting from a temperature corresponding to the experimental excitation energy of the compound system, nucleons are propagated along isentropic paths towards scission. The study focuses on the energy partitioning at scission, including dissipated energy along the fission path and the prescission kinetic energy, for four illustrative cases of induced fission. The model is also applied to the dynamics of neck formation and rupture, characterized by the formation of few-nucleon clusters in the low-density region between the nascent fragments.
Article
Physics, Nuclear
Jie Zhao, Tamara Niksic, Dario Vretenar
Summary: This model calculates the total kinetic energy distribution of fission fragments using the time-dependent generator coordinate method extended to include dissipation effects. It computes the integrated flux of probability current and the kinetic energy at scission for a specific pair of fragments to determine the TKE distribution.
Article
Physics, Multidisciplinary
F. Mercier, J. Zhao, J-P Ebran, E. Khan, T. Niksic, D. Vretenar
Summary: In this study, half-lives calculations for alpha decay of Po-212 and Ra-224 were performed using a microscopic self-consistent framework. The results showed good agreement with experimental values. Additionally, a new decay mode consisting of symmetric 2 alpha emission was predicted.
NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS
(2022)
Article
Physics, Nuclear
Jie Zhao, Tamara Niksic, Dario Vretenar
Summary: This study combines quantum theory of dissipation and time-dependent generator coordinate method (TDGCM) to incorporate dissipation effects in the description of induced fission dynamics. By accounting for the dissipation of energy from collective motion into intrinsic degrees of freedom through the addition of an extra term in the Hamiltonian, the effectiveness of this approach is demonstrated through a calculation of induced fission in Th-228.
Article
Physics, Nuclear
Z. X. Ren, J. Zhao, D. Vretenar, T. Niksic, P. W. Zhao, J. Meng
Summary: The dynamics of low-energy-induced fission is studied using a consistent microscopic framework that combines the time-dependent generator coordinate method and time-dependent nuclear density functional theory. Two methods based on the same nuclear energy density functional and pairing interaction are employed in an illustrative study of 240Pu induced fission. Fission observables are calculated and compared with available data.
Article
Physics, Nuclear
D. D. Zhang, Z. X. Ren, P. W. Zhao, D. Vretenar, T. Niksic, J. Meng
Summary: The effects of rotation and valence nucleons in molecular linear alpha-chain nuclei are analyzed using a three-dimensional lattice cranking model based on covariant density functional theory. The study reveals that with increasing rotational frequency, the valence nucleons transition from the pi molecular orbital to the sigma molecular orbital, thus stabilizing the 3 alpha linear chain structure. The research also shows that the transition frequencies for valence protons and neutrons differ in different nuclei.
Article
Physics, Nuclear
Jie Zhao, Tamara Niksic, Dario Vretenar
Summary: The role of dynamical pairing in induced fission dynamics was investigated using the time-dependent generator coordinate method, showing a pronounced effect on collective inertia and collective flux, leading to reduced asymmetric peaks and enhanced symmetric fission yields in better agreement with empirical trends.
Article
Physics, Nuclear
K. Nomura, D. Vretenar, Z. P. Li, J. Xiang
Summary: The study investigates the effect of coupling between pairing and quadrupole triaxial shape vibrations on low-energy collective states of gamma-soft nuclei. By simultaneously considering both the shape and pairing collective degrees of freedom, the EDF-based IBM successfully reproduces data on low-energy 0(+) states and gamma-vibrational bands.
Article
Physics, Nuclear
K. Nomura, D. Vretenar, Z. P. Li, J. Xiang
Summary: This study addresses the long-standing problem of the simultaneous description of shape oscillations and pairing vibrations in deformed nuclei, using self-consistent mean-field calculations and the framework of the interacting boson approximation. Explicit coupling to pairing vibrations is taken into account, showing the importance of dynamical pairing degrees of freedom in low-energy excited states of gamma-soft and triaxial nuclei, as illustrated for Xe-128 and Xe-130.
Article
Physics, Nuclear
K. Nomura, L. Lotina, T. Niksic, D. Vretenar
Summary: The study shows the presence of octupole-deformed equilibrium states in the potential energy surfaces of Ba and Ce isotopes with N approximately equal to 56 and 88. The evolution of spectroscopic properties indicates enhanced octupole correlations in regions corresponding to N approximately equal to Z approximately equal to 56, Z approximately equal to 88, and Z approximately equal to 56, and N approximately equal to 56 and Z approximately equal to 34.
Article
Physics, Nuclear
Giacomo Accorto, Tomoya Naito, Haozhao Liang, Tamara Niksic, Dario Vretenar
Summary: A model was developed to improve relativistic nuclear energy density functionals towards an exact but unknown Kohn-Sham Hartree-exchange-correlation functional, using empirical exact ground-state densities of finite systems. Testing and illustrative calculations were performed to reproduce the parameters and density dependence of a target functional from two different approximate functionals, based on exact ground-state densities of symmetric N = Z systems.
Article
Physics, Nuclear
F. Mercier, A. Bjelcic, T. Niksic, J-P Ebran, E. Khan, D. Vretenar
Summary: This study investigates the isoscalar low-energy response of N = Z nuclei using the finite amplitude method based on the microscopic nuclear energy density functionals framework. The low-energy strength functions exhibit prominent peaks attributed to cluster mode structures in light nuclei with large deformation, depending on the multipolarity of the excitation and equilibrium deformation of specific isotopes.
Article
Physics, Nuclear
Mira Varma, Oliver K. Baker
Summary: In this letter, the authors expand upon the previous work to demonstrate the entanglement observed in top quark interactions. They propose that the thermal component caused by proton collisions with top quarks emerges from entanglement within the proton wave function, and they use published results to show the expected behavior.
Article
Physics, Nuclear
E. Ya. Paryev
Summary: In this study, we investigate the near-threshold meson photoproduction from protons and nuclei and explore the possibility of observing non-strange hidden-bottom pentaquark states through differential observables. We calculate the excitation functions and energy/momentum distributions for different production processes and propose that future experiments at high-luminosity electron-ion colliders could provide evidence for the existence of these hidden-bottom pentaquark resonances.
Article
Physics, Nuclear
M. Shariq Asnain, Manoj Kumar Sharma, Mohd. Shuaib, Aquib Siddique, Ishfaq Majeed Bhat, B. P. Singh, R. Prasad
Summary: This study validates the compound nucleus theory using heavy ion beams and different targets. By analyzing cross section data and comparing reaction cross section data, the study confirms the validity of the theory, but also observes discrepancies at lower excitation energies.
Article
Physics, Nuclear
Y. G. Yao, X. Y. Wu, H. Mei
Summary: This study presents a microscopic investigation of the electromagnetic properties of the low-lying states of single-A hypernucleus 9ABe using the HyperGCM method based on covariant density functional theory. The results are compared to those of a particle-rotor model (PRM) and show close agreement. It is found that the electric quadrupole transition strengths are more sensitive to the coupling strengths of the AN interaction than the magnetic moments and M 1 transition strengths.
