English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The $\beta$ decay of the odd-odd nucleus $^{70}$Br has been investigated withthe BigRIPS and EURICA setups at the Radioactive Ion Beam Factory (RIBF) of theRIKEN Nishina Center. The $T=0$ ($J^{\pi}=9^+$) and $T=1$ ($J^{\pi}=0^+$)isomers have both been produced in in-flight fragmentation of $^{78}$Kr withratios of 41.6(8)\% and 58.4(8)\%, respectively. A half-life of$t_{1/2}=2157^{+53}_{-49}$ ms has been measured for the $J^{\pi}=9^+$ isomerfrom $\gamma$-ray time decay analysis. Based on this result, we provide a newvalue of the half-life for the $J^{\pi}=0^+$ ground state of $^{70}$Br,$t_{1/2}=78.42\pm0.51$ ms, which is slightly more precise, and in excellentagreement, with the best measurement reported hitherto in the literature. Forthis decay, we provide the first estimate of the total branching fractiondecaying through the $2^+_1$ state in the daughter nucleus $^{70}$Se,$R(2^+_1)=1.3\pm1.1\%$. We also report four new low-intensity $\gamma$-raytransitions at 661, 1103, 1561, and 1749 keV following the $\beta$ decay of the$J^{\pi}=9^+$ isomer. Based on their coincidence relationships, we tentativelypropose two new excited states at 3945 and 4752 keV in $^{70}$Se with mostprobable spins and parities of $J^{\pi}=(6^+)$ and $(8^+)$, respectively. Theobserved structure is interpreted with the help of shell-model calculations,which predict a complex interplay between oblate and prolate configurations atlow excitation energies.

Simultaneous investigation of the $\mathbf{T=1~ (J^{\pi}=0^+)}$ and $\mathbf{T=0 ~ (J^{\pi}=9^+)}$ $\beta$ decays in $^{70}$Br