Speaker
Dr.
Ivan Borzov
(1 National Research Centre “Kurchatov Institute”, 123182, Moscow, Russia)
Description
I.N. Borzov 1,2*
1 National Research Centre “Kurchatov Institute”, 123182, Moscow, Russia
2 Bogolubov Laboratory of Theoretical Physics, Joint Institute of Nuclear Research, 141980, Dubna, Russia
Performance of the global self-consistent models of nuclear beta decay is analysed. We compare the results of the interacting shell-model [1], continuum quasiparticle random phase approximation DF+CQRPA based on the Fayans functional [2], relativistic Hartry-Bogolubov QRPA [3], and Finite Amplitude Method [4] based on the Skyrme functional. All the frameworks include both the allowed Gamow–Teller and first-forbidden beta decays on the same microscopic footing. The beta-decay half-lives and delayed multi- neutron emission branchings are confronted for the “reference nuclides” near the major neutron shells-closures at N=50, 82. An emphasis is made on the share of the first-forbidden decays in the total rates. The results are also checked against the known hindrance factors and for consistency with available experimental decay schemes. A detailed beta decay study is performed for the K, Ca, Sc nuclides near the new neutron sub-shells at N=32, 34. In a view of recently discovered anomalous nuclear radii in heavy Ca isotopes [5], a special attention is payed to possible constraints imposed by the beta-decay strength functions, half-lives and delayed multi-neutron emission branchings on the strength of quasiparticle-phonon coupling. Taking an account of this effect has been found to be of prime importance for solving the problem of “Ca anomaly” [6].
[1] Q. Zhi, E. Caurier, J. Cuenca-Garc’ia, K. Langanke, G. Mart’inez-Pinedo, K. Sieja, Phys. Rev. C87, 025803 (2013).
[2] I. N. Borzov.,Phys. Rev. C 67, 025802 (2003).
[3] T. Marketin, L.Huther, G. Martinez-Pinedo., Phys. Rev. C 93, 025805 (2015).
[4] M. T. Mustonen, T. Shafer, Z. Zenginerler, J. Engel., Phys.Rev. C 90, 024308 (2014).
[5] A.Garcia-Ruiz et al., Nature, Physics 12, 594 (2016); http://dx.doi:10.1038/nphys3645.
[6] E.E. Saperstein, I.N. Borzov, S.V. Tolokonnikov., JETP Letters, 104,218 (2016).
Primary author
Dr.
Ivan Borzov
(1 National Research Centre “Kurchatov Institute”, 123182, Moscow, Russia)
