科研之友
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摘要
In this paper we present a timely application of the proton-neutron deformed quasiparticle random-phase approximation (pn-dQRPA), designed to describe in a consistent way the 1(+) Gamow-Teller states in odd-odd deformed nuclei. For this purpose we apply a projection before variation procedure by using a single-particle basis with projected angular momentum, provided by the diagonalization of a spherical mean field plus quadrupole-quadrupole interaction. The residual Hamiltonian contains pairing plus proton-neutron dipole terms in particle-hole and particle-particle channels, with constant strengths. As an example we describe the two-neutrino double-beta (2 nu beta beta) decay of Nd-150 to the ground state of Sm-150. The experimental (p, n) type of strength in Nd-150 and the (n, p) type of strength in Sm-150 are reasonably reproduced and the 2 nu beta beta decay matrix element depicts a strong dependence upon the particle-particle strength g(pp). The experimental half-life is reproduced for g(pp) = 0.05. It turns out that the measured half-lives for 2 nu beta beta transitions between other deformed superfluid partners with mass numbers A = 82,96,100,128,130,238 are reproduced with fairly good accuracy by using this value of gpp.
- 出版日期2015-5-28
