TY  - JOUR
AU  - Vitez-Sveiczer, A. et al
AU  - Algora, A.
AU  - Morales, A. I.
AU  - Rubio, B.
AU  - Agramunt, J.
AU  - Guadilla, V.
AU  - Montaner-Piza, A.
AU  - Orrigo, S. E. A.
PY  - 2022
DA  - 2022//
TI  - The beta-decay of Kr-70 into Br-70: Restoration of the pseudo-SU(4) symmetry
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 137123
EP  - 8pp
VL  - 830
PB  - Elsevier
KW  - Beta decay of Kr-70
KW  - pn pairing
KW  - GT strength distribution
KW  - Pseudo-SU(4) symmetry
KW  - QRPA calculations
AB  - The beta-decay of the even-even nucleus Kr-70 with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen gamma-rays associated with the beta-decay of( 70)Kr into Br-70 have been identified for the first time, defining ten populated states below E-exc=3300 keV. The half-life of Kr-70 was derived with increased precision and found to be t(1/2)=45.19 +/- 0.14 ms. The beta-delayed proton emission probability has also been determined as epsilon(p)=0.545(23)%. An increase in the beta-strength to the yrast 1(+) state in comparison with the heaviest Z=N+2 system studied so far (Ge-62 decay) is observed that may indicate increased np correlations in the T=0 channel. The beta-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system.
SN  - 0370-2693
UR  - https://doi.org/10.1016/j.physletb.2022.137123
DO  - 10.1016/j.physletb.2022.137123
LA  - English
N1  - WOS:000832707200002
ID  - Vitez-Sveiczer_etal2022
ER  -