Low-energy structure of 61Mn populated following $β$ decay of 61Cr

Details Low-energy structure of 61Mn populated following $β$ decay of 61Cr Low-energy structure of 61Mn populated following $β$ decay of 61Cr

2009-04-29

arxiv.org/abs/0904.4710v1

Physics

Nuclear Physics

Nuclear Experiment

19 pages, 7 figures, accepted to Physical Review C

Scientific paper

$\beta$ decay of the $^{61}$Cr$_{37}$ ground state has been studied. A new half-life of 233 +/- 11 ms has been deduced, and seven delayed $\gamma$ rays have been assigned to the daughter, $^{61}$Mn$_{36}$. The low-energy level structure of $^{61}$Mn$_{36}$ is similar to that of the less neutron-rich $^{57,59}$Mn nuclei. The odd-A $_{25}$Mn isotopes follow the systematic trend in the yrast states of the even-even, Z + 1 $_{26}$Fe isotopes, and not that of the Z - 1 $_{24}$Cr isotopes, where a possible onset of collectivity has been suggested to occur already at N = 36.

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