Kaur, Devinder PalBehera, B. R.Madhavan, N.Nath, S....
17页
查看更多>>摘要：Evaporation residue (ER) cross-sections have been measured for the Ti-48 + Ce-140,Ce-142 reactions to understand the influence of neutron shell closure on compound nucleus (CN) formation. The measured ER cross-sections for Ti-48 + Ce-140 (N-T= 82) system are found to be very close to those of Ti-48 + Ce-142 (N-T= 84) near the Coulomb barrier. The results show that the effect of shell closure in the target nucleus on fusion cross-sections is negligible for the present systems which can be attributed to the small values of the shell correction energies in the entrance channel. Statistical model calculations are performed to interpret the experimental results. Further, comparison of the present results with those from a reaction with higher mass asymmetry in the entrance channel shows no evidence of quasifission in the present systems. (C) 2022 Elsevier B.V. All rights reserved.
查看更多>>摘要：In this theoretical study, we calculate the ground state parameters like binding energy, charge radii, neutron skin-thickness, chemical potentials, quadrupole deformation parameter, neutron separation energy, and single-particle energy for Hf isotopes of mass 170 <= A <= 220. The potential energy surface in parallel with the Fermi energy as a function of the quadrupole deformation parameter is estimated to determine the ground state configuration. The Relativistic Hartree-Bogoliubov approach with density-dependent DD-ME2 and the relativistic mean-field formalism with the popular NL3 and NL3* parameter sets are used for the present analysis. The study involves a constant gap BCS approach within NL3, & NL3* and Bogoliubov transformation within DD-ME2 parameter sets to examine the effect of pairing correlations. The calculated bulk quantities are reasonably good agreement with available experimental data, the finite range droplet model predictions, and the Weizsacker-Skyrme mass formula. We find the signature of shell/sub-shell closure at N = 126 for all the parameter sets, which indicates the stability of Hf-198 in the neutron drip-line region of the Hf-isotopes.(C) 2021 Elsevier B.V. All rights reserved.
查看更多>>摘要：A systematic study of the nuclear observables related to the triaxial nature of the even-even( 104-122)Cd isotopes is presented microscopically using multi-quasiparticle triaxial projected shell model (TPSM) approach. In the present work, we have performed a detailed study of gamma-bands in cadmium isotopes in addition to the yrast band. The present calculations are found to reproduce the observed systematics of the R-42 = [E(4(1)(+))/E(2(1)(+))], E-GOS plots and B(E2) values for Cd104-122 isotopic mass chain. The EGOS plots along with the R-42 ratios predict the quasi-deformed structure for these bands. Besides this, odd-even staggering in gamma bands, inter band and intra band reduced transition probabilities and g-factors have also been discussed in the present work and it is shown that TPSM approach provides a reasonable description of the measured properties. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
查看更多>>摘要：Based on simulating the saturation property of cold nuclear matter for complete fusion channel of two approaching nuclei, we systematically investigate the role of nuclear incompressibility in the nucleus nucleus potential and fusion-evaporation cross section of 69 medium-heavy and heavy mass systems with 208 <= Z(1)Z(2) <= 1520. Our observations based on the uncoupled single-barrier potential model and the M3Y double-folding potential which is corrected with a repulsive core term reveal that the incompressibility of cold nuclear matter can be responsible for the discrepancy between the measured and calculated values of the fusion cross sections at energies around and above the Coulomb barrier. In other words, one can find that the high energy fusion cross sections can not be reproduced using the standard form of the M3Y-DF potential model without considering the repulsive core effects. We show that the strength of the repulsive contact term and also the incompressibility of the compound nuclei exhibit systematic behaviors with respect to the atomic and mass numbers of reacting nuclei. It is shown that the hardness level of nuclear matter reduces when one passes from lighter to heavier systems. (C)& nbsp;2022 Elsevier B.V. All rights reserved.& nbsp;
查看更多>>摘要：The excited states of Sb-116 have been populated using the alpha induced reaction In-115(alpha, 3n)Sb-116 at a beam energy of 40 MeV and investigated via in-beam gamma spectroscopic techniques. A positive parity sequence (B1) of strong M1 transitions with relatively weak crossover E2 transitions, connected to the yrast negative parity rotational band (B2) of Sb-116, has been observed. The experimental B(M1)/B(E2) values for band B1 are found to decrease with angular momentum (I). The origin of this band (B1) has been interpreted in terms of Magnetic Rotation (MR) under the framework of Semi-Classical Model (SCM) and Shears mechanism with Principal Axis Cranking (SPAC) formalism and is assigned a four quasiparticle configuration of pi (g9/2)(-1) circle times nu(g(7/2)/d(5/2))(h(11/2))(2). The yrast rotational band B2 is extended up to the band crossing region.& nbsp;(C) 2022 Elsevier B.V. All rights reserved.
查看更多>>摘要：The alpha-decay half-lives of 204 superheavy nuclei covering the range 114 <= Z <= 126 have been investigated using the relativistic mean-field model (RMF) for NL3* parameter set. The ground state bulk properties such as binding energy, quadrupole deformation parameter (beta(2)), and root-mean-square charge radii for these nuclei are analyzed. Four different semi-empirical formulae, namely, the universal decay law (UDL), the Viola-Seaborg (VSS) formula, the modified universal decay law (MUDL), and the modified Brown formula (MBrown), are used to obtain the alpha-decay half-lives for the considered nuclei. To examine the applicability of relativistic mean-field model within NL3* parametrization, the alpha-decay energies, and the half-lives of a few known superheavy nuclei within the range 102 <= Z <= 118 are calculated and the results are compared with the experimental data along with the theoretical predictions. The alpha-decay energies (Q-values) are estimated from the binding energies of the parent, and daughter from the RMF (NL3*) parameter set. The calculated results are compared with macroscopic-microscopic Finite-Range-Droplet Model (FRDM), Global Nuclear Mass Model (WS3, WS4), Weizsacker-Skyrme mass model (WS*) predictions, and the experimental data, wherever available. The possible standard deviations are also estimated for experimental and various theoretical predictions. We find a good consistency for the experimental-to-UDL, FRDM-to-UDL, and WS4-to-UDL estimates of the decay energy and corresponding half-life. The present analysis provides the theoretical predictions within the microscopic model for the upcoming experiments on the superheavy region. (C)& nbsp;2021 Elsevier B.V. All rights reserved.
查看更多>>摘要：We study the impact of SU(3) flavor symmetry breaking on the properties of dynamically generated A & nbsp;states within an effective separable potential model describing the coupled channels over line KN system. The model is based on the chiral meson-baryon Lagrangian at next-to-leading order, and constitutes an improvement over a previous model developed by our group, with its applicability being extended to higher energies covering the A(1670) resonance region. It is demonstrated that the ratios of channel couplings to the resonant states can vary dramatically when the flavor breaking is gradually switched off, tracing a path to the restored SU(3) symmetry. We conclude that the couplings determined from physical observables cannot be used to reliably relate a given resonance to a specific flavor multiplet.(c) 2022 Elsevier B.V. All rights reserved.
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