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[en] The advent and application of nuclear beam facilities allows exploring the nuclear properties of the chart of nuclides from proton-rich nuclei to the neutron drip-line. Recently, Z = 50 mass region is the matter of interest in nuclear structure studies due to the availability of large number of stable isotopes in this region with the occurrence of other important features around Z = 50 like shell closure. The evidence of the quenching of the N = 82 shell closure in 130Cd opened up new possibilities in r-process calculations in this region. However, experimental observations in this area of very neutron-rich waiting point nuclei are still unknown. Although it is evident that the neutron-rich Cd isotopes shows different behavior while approaching N = 82 shell gap but recent observation about excited states of 130Cd does not predict any reduced N = 82 gap in this nucleus. The large measured Q-value and substantially shorter beta-decay half-live also indicates quenching of the N = 82 neutron shell closure for Cd isotopes
[en] We studied the temperature effects of 234U, 236U and 240Pu within the TRMF formalism with NL3 parameter set. These nuclei are obtained by the fissile isotopes 233U, 235U, and 239Pu after absorption of a thermal neutron. We noticed two types of phase transitions with temperature. The first order phase transition at Tc= 1.4, 1.5 and 1.7 MeV is found from deformed to spherical shape with temperature and the second order transition from super fluid phase to normal phase is seen at T= 0.4 MeV for all the three nuclei 234U, 236U and 240Pu. We are further studying fission properties of these nuclei by extending the Lagrangian to self coupling of ω-meson and cross coupling of ω and ρ mesons
[en] Since 1940, the fission phenomena has been successfully studied for nuclei which are mainly confined in the valley of stability. Out of the ∼ 300 nuclei, in nature only three isotopes (233U, 235U and 239Pu) are thermally fissile on the stability line and have been mainly used in reactors for the power generation. Since these nuclei are very much limited, we mainly investigate whether heavier neutron-rich isotopes of Th and U having thermally fissile properties could exist or not, and if exist then what should be their various nuclear properties
[en] We have theoretically studied the astrophysically important S-factor of (p, γ) reactions at low energy of some p-nuclei in comparison with available experimental data by using microscopic optical mode potential with the help of Hauser-Feshbach reaction code TALYS using relativistic mean field densities. This is done by folding the density-dependent M3Y (DDM3Y) interaction with relativistic mean field (RMF) spherical densities. Different parameter sets G2, NLSH, NL3* and DD-PC1 are used in the density calculation. The role of different densities on S-factor for various low energy (p, γ) reactions is discussed. Astrophysical reaction rates of these nuclei are also compared with the standard NON-SMOKER results. (author)
[en] We have studied the fission parameters of hot neutron-rich thermally fissile and nuclei within the temperature dependent effective field theory motivated relativistic mean field (E-TRMF) formalism by using the recently developed FSUGarnet and IOPB-I parameter sets. The results obtained by these two forces are compared with the results of the well known and widely accepted NL3 parameter set. The excitation energy , shell correction energy , single particle energy for neutrons and protons , level density parameter a, neutron skin thickness ΔR, two neutron separation energy , and asymmetry energy coefficient of these neutron-rich thermally fissile nuclei are calculated at finite temperature. The dependency of level density parameter and other observables on the temperature and the force parameters (interaction Lagrangian) are discussed.