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Communications in Theoretical Physics (02536102)35(1)pp. 67-70
The excitation function for the fission of 230Th induced by neutrons has an unusual maximum for neutron energies in the vicinity of 700 KeV. It has been suggested that this maximum may be associated with the vibrational-mode resonance states. The unusual peak in the excitation function is interpreted in terms of a vibrational-mode resonance state in a two-humpted fission barrier. From theoretical fits to the fission cross sections and angular distributions, it is shown that the resonance has K = 1/2.
Physical Review C - Nuclear Physics (5562813)63(6)pp. 646071-646075
The statistical scission model is applied to fission fragment angular distributions from heavy-ion induced reactions. It is shown that the statistical scission model predicts angular distributions in good agreement with those measured from heavy-ion induced fission of some reaction systems where the fission barrier has vanished or is very small relative to the nuclear temperature. The statistical variances extracted from these model calculations are compared with their corresponding values from a microscopic theory, which includes nuclear pairing interaction. It is found that the values of statistical variance S20 are very sensitive to the pairing energy. The effects of pairing interaction on the fragment angular distributions are illustrated and discussed.
Communications in Theoretical Physics (02536102)37(4)pp. 457-460
The level densities of even-odd and even-even isotopes 161,162Dy, 166Er and 171,172Yb were calculated using microscopic theory of interacting fermions and compared with experiments. It is found that the data can be well reproduced with level density formalism for nuclei with static deformation. The nuclear temperature as well as the entropy of nuclear system as a function of excitation energy has been extracted from the BCS theory. It is shown that the entropy exhibits an S-formed shape as a function of excitation energy. This is interpreted as a phase transition. Procedure of treating the even-odd and even-even nuclear systems has been presented and discussed.
