TY  - JOUR
AU  - Van Isacker, P.
AU  - Algora, A.
AU  - Vitéz-Sveiczer, A.
AU  - Kiss, G. G.
AU  - Orrigo, S. E. A.
AU  - Rubio, B.
AU  - Aguilera, P.
PY  - 2023
DA  - 2023//
TI  - Gamow-Teller Beta Decay and Pseudo-SU(4) Symmetry
T2  - Symmetry-Basel
JO  - Symmetry-Basel
SP  - 2001 - 15pp
VL  - 15
IS  - 11
PB  - Mdpi
KW  - Gamow-Teller beta decay
KW  - pseudo-SU(4) symmetry
KW  - odd-odd N = Z nuclei
AB  - 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.
UR  - https://doi.org/10.3390/sym15112001
DO  - 10.3390/sym15112001
LA  - English
N1  - WOS:001114520800001
ID  - VanIsacker_etal2023
ER  -