Temperature dependent effects and statistical gamma-ray multiplicities in the147Sm(3He, ?)146Sm reaction

Abstract

Gamma-ray multiplicities associated with the statistical decay from highly excited states in 146Sm are calculated. The formalism, which accounts for the temperature dependence of the level density parameter, is applied to the analysis of the statistical gamma decay from states populated by the (3He, e) reaction. The results are found to be in a reasonable agreement with the experimental data.PACS : 25.55. Ek

Temperature dependent effects upon statistical particle and gamma ray emission from a compound nucleus

“…The results of Fig. This feature has been discussed in detail in connection with the available experimental information [15] and we are presenting it here for the sake of completeness and in order to show the dependence of our results upon the adopted values for the exponent r of Eq. It means that the neutron could be emitted from a narrow energy interval, because of the strong pairing correlations, which, as the temperature increases, are gradually blocked thus allowing for an increasing range of neutron energies.…”

“…The values correspond to the approximations which we have considered. We have followed the method presented in [15] and the results show a systematic dominance of the multiplicities corresponding to the temperature dependent approximation, a(T), with respect to the temperature independent one, a0. 2a, correspond to the temperature dependent approximation and the probability distributions show the expected exponential behaviour at high neutron energies, while the positions and values of the peaks depend upon the com- Table 1.…”

“…In a previous work [15] we have shown the effects of the temperature dependence of the level density parameter, a(T) on the average gamma-ray multiplicities associated with statistical dipole electric transitions. While the Fermi Gas Model approximation and the temperature dependent one give comparable results for high excitation energies, the discrepancies between both approximations are noticeable for low excitation energies of the compound nucleus.…”

“…is the intrinsic level density, at the nuclear temperature T. The quantities which appear in (7) have been defined in detail in [14,15] and we shall follow here the same definitions. In the Fermi Gas Model approximation [16], the function D(T) is temperature independent and its value is given by…”