Abstract
The impact factors on the decay heat calculation are studied for the neutron sufficient even-even nuclei of Te, Xe, Ba, Ce, Nd and Sm isotopes, including: nuclear deformation, nuclear structure complexity and level density. By comparing the calculated results of QRPA method and gross theory with the experimental results, it is found that for the case of even-even nuclei considered in this paper: gross theory presents better results for the situation of daughter nuclei with complex level scheme, showing its statistical method nature; QRPA method presents better results for near spherical nuclei. Both methods are not affected by the level density.
Highlights
Beta decay heat is an important factor for the nuclear reactors’ design and safety analysis, and massive experimental and theoretical efforts have been devoted for its accurate prediction [1,2,3,4,5,6,7,8,9]
Kinds of nuclear models based on various approximations or in a limited configuration space are developed for this topic, including the macroscopic gross theory (GT) [4,5,6,7], and two different microscopic approaches i.e., shell model [8] and the quasiparticle random phase approximation (QRPA) approach [9,10,11,12,13,14,15,16,17,18,19,20, 22]
The self-consistent QRPA approach has become a current trend in nuclear structure study and successfully described some nuclear properties like the beta-decay half-lives
Summary
Beta decay heat is an important factor for the nuclear reactors’ design and safety analysis, and massive experimental and theoretical efforts have been devoted for its accurate prediction [1,2,3,4,5,6,7,8,9]. The self-consistent QRPA approach has become a current trend in nuclear structure study and successfully described some nuclear properties like the beta-decay half-lives. The comparison has been presented, for the decay heat of neutron sufficient even-even nuclei of Te, Xe, Ba, Ce, Nd, Sm and Gd isotopes, among the experiment data, the calculation results of the self-consistent QRPA approaches based on covariant density functional theory (CDFT) and the gross theory. It would be worthy to discuss the factors impacting the theoretical calculation, like the nuclear deformation, level density and level scheme complexity, to help improve the ability and reliability of the theoretical prediction
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