Shell model analysis of the $B(E2,2^{+}\to 0^{+})$'s in the A=70 T=1 triplet

Abstract

he $B(E2,2^{+}\to 0^{+})$ transition strengths of the T=1 isobaric triplet ${}^{70}$Kr, ${}^{70}$Br, ${}^{70}$Se, recently measured at RIKEN/RIBF, are discussed in terms of state of the art large scale shell model calculations using the JUN45 and JUN45+LNPS plus Coulomb interactions. In this letter we argue that, depending on the effective charges used, the calculations are either in line with the experimental data within statistical uncertainties, or the anomaly happens in ${}^{70}$Br, rather than ${}^{70}$Kr. In the latter case, we suggest that it can be due to the presence of a hitherto undetected 1${}^{+}$ T=0 state below the yrast 2${}^{+}$ T=1 state. Our results do not support a shape change of ${}^{70}$Kr with respect to the other members of the isobaric multiplet.

arXiv comment4 pages, 3 figures. To be submitted to Phys. Rev. C

References in corpus (10)

• The Shell Model as Unified View of Nuclear Structure
• The realistic collective nuclear Hamiltonian
• Isobaric multiplet yrast energies and isospin non-conserving forces
• Nilsson-SU3 selfconsistency in heavy N=Z nuclei
• Is there np pairing in odd-odd N=Z nuclei?
• Variation in displacement energies due to isospin nonconserving forces
• Shape changes in the mirror nuclei ${}^{70}$Kr and ${}^{70}$Se
• Isospin nonconserving interaction in the T=1 analogue states of the mass-70 region
• Isospin symmetry breaking in the mirror pair ${}^{73}$Sr-${}^{73}$Br
• On the inversion of isobaric-analogue states in nuclei

Cited by in corpus (5)

• The structure of ${}^{36}$Ca under the Coulomb magnifying glass
• The $\beta$-decay properties of $N=Z$ nuclei: Role of neutron-proton pairing and the shell model interpretation
• Proxy-$SU(4)$ symmetry in A=60-90 region
• Proton removal from ${}^{73,75}$Br to ${}^{72,74}$Se at intermediate energies
• Ab initio study of $\beta$-decay and pairing in $N=Z$ nuclei