%0 Journal Article
%T Gamow-Teller Beta Decay and Pseudo-SU(4) Symmetry
%A Van Isacker, P.
%A Algora, A.
%A Vitéz-Sveiczer, A.
%A Kiss, G. G.
%A Orrigo, S. E. A.
%A Rubio, B.
%A Aguilera, P.
%J Symmetry-Basel
%D 2023
%V 15
%N 11
%I Mdpi
%G English
%F VanIsacker_etal2023
%O WOS:001114520800001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5843), last updated on Thu, 21 Dec 2023 07:56:40 +0000
%X We report on recent experimental results on beta decay into self-conjugate ( N = Z) nuclei with mass number 58 <= A <= 70. Super-allowed b decays from the J(pi) = 0(+) ground state of a Z = N + 2 parent nucleus are to the isobaric analogue state through so-called Fermi transitions and to J(pi) = 1(+) states by way of Gamow-Teller (GT) transitions. The operator of the latter decay is a generator of Wigner's SU(4) algebra and as a consequence GT transitions obey selection rules associated with this symmetry. Since SU(4) is progressively broken with increasing A, mainly as a consequence of the spinorbit interaction, this symmetry is not relevant for the nuclei considered here. We argue, however, that the pseudo-spin-orbit splitting can be small in nuclei with 58 <= A <= 70, in which case nuclear states exhibit an approximate pseudo-SU(4) symmetry. To test this conjecture, GT decay strength is calculated with use of a schematic Hamiltonian with pseudo-SU(4) symmetry. Some generic features of the GT beta decay due to pseudo-SU(4) symmetry are pointed out. The experimentally observed GT strength indicates a restoration of pseudo-SU(4) symmetry for A = 70.
%K Gamow-Teller beta decay
%K pseudo-SU(4) symmetry
%K odd-odd N = Z nuclei
%R 10.3390/sym15112001
%U https://doi.org/10.3390/sym15112001
%P 2001 - 15pp