β -decay properties of neutron-rich rare-earth isotopes

Abstract

In this paper, β-decay properties of even-even neutron-rich isotopes in the rare-earth mass region are studied within a microscopic theoretical approach based on a proton-neutron quasiparticle random-phase approximation. The underlying mean field is constructed self-consistently from a deformed Hartree-Fock calculation with Skyrme interactions and pairing correlations to which particle-hole and particle-particle residual interactions are added. Nuclei in this mass region participate in the astrophysical rapid neutron capture process and are directly involved in the generation of the rare-earth peak in the isotopic abundance pattern centered at A 160. The energy distributions of the Gamow-Teller strength as well as the β-decay half-lives and the β-delayed neutron-emission probabilities are discussed and compared with the available experimental information and with calculations based on different approaches.

β -decay properties of neutron-rich Ca, Ti, and Cr isotopes

“…To describe GT transitions, we add to the mean field separable spin-isospin residual interactions in the ph and pp channels, which are treated in a deformed pnQRPA [24-27, 36, 37]. According to previous calculations within this formalism [33][34][35]38], we use the values χ ph GT = 0.15…”

Microscopic calculations of weak decays in superheavy nuclei

“…The GT strength distributions and β-decay half-lives have been studied in the past within this model in various mass regions that include neutron-deficient isotopes in the A ≈ 70 mass region [44,45] and in the lead region [39,46,47]; neutron-rich isotopes in medium-mass [48][49][50][51], and rare-earth nuclei [52]; and f p-shell nuclei [53][54][55]. The sensitivity of the GT strength distributions to different ingredients of the theoretical formalism were studied in those works with especial emphasis on the deformation dependence of the decay properties.…”

The BRIKEN Project: Extensive Measurements of $\beta $-delayed Neutron Emitters for the Astrophysical r Process

“…The combined information provides constraints on the theoretical models calculating S β (E x ), thus improving their predictive power for nuclei as yet unmeasured. Alternatively, these two quantities together can provide information about the nuclear shell structure [19] or about the deformation of the nucleus [20,21]. Additional nuclear structure information can come from the precise location of excited states and their βn feeding intensity obtained with the CLOVER γ-ray detectors.…”