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- W4308504053 abstract "Yrast and near-yrast states above the known 25/2$^{+}$ isomer in $^{207}$At are established for the first time. The level scheme is extended up to 47/2$hbar$ and 6.5 MeV with the addition of about 60 new $gamma$-ray transitions. The half-life of the 25/2$^{+}$ isomer is revisited and a value of $T_{1/2}$ = 107.5(9) ns is deduced. Evidence of a hitherto unobserved 29/2$^{+}$ isomer in $^{207}$At is presented. A systematic study of $B(E3)$ values for the transitions de-exciting the 29/2$^{+}$ isomer in the neighboring odd-$A$ At isotopes suggests a half-life in the 2$-$4.5 $mu$s range for this state in $^{207}$At. The experimental results are compared with large-scale shell-model calculations performed using the KHM3Y effective interaction in the $Z$ = 50$-$126, $N$ = 82$-$184 model space and an overall good agreement is noted between the theory and the experiment. A qualitative comparison of the excited states and the isomers with analogous states in neighboring nuclei provides further insight into the structure of $^{207}$At." @default.
- W4308504053 created "2022-11-12" @default.
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- W4308504053 date "2022-11-04" @default.
- W4308504053 modified "2023-10-16" @default.
- W4308504053 title "High-spin spectroscopy in $^{207}$At: Evidence of a 29/2$^{+}$ isomeric state" @default.
- W4308504053 doi "https://doi.org/10.48550/arxiv.2211.02406" @default.
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