Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-04-26
Physics of Atomic Nuclei 74, 971-978 (2011)
Physics
Nuclear Physics
Nuclear Theory
19 pages, 3 figures, accepted for publication in Physics of Atomic Nuclei
Scientific paper
10.1134/S1063778811070143
Low-lying spectra and several high-spin states of odd--even $^{61,63,65}$Co isotopes are calculated in two different shell-model spaces. First set of calculations have been carried out in ${fp}$ shell valence space (full $fp$ space for $^{63,65}$Co and a truncated one for $^{61}$Co) using two recently derived ${fp}$ shell interactions, namely GXPF1A and KB3G, with $^{40}$Ca as core. Similarly, the second set of calculations have been performed in ${fpg_{9/2}}$ valence space using an ${fpg}$ effective interaction due to Sorlin {\it et al}., with $^{48}$Ca as core and imposing a truncation. It is seen that the results of GXPF1A and KB3G are reasonable for $^{61,63}$Co. For $^{65}$Co, shell-model results show that the ${fpg}$ interaction adopted in the study is inadequate and also point out that it is necessary to include orbitals higher than $1g_{9/2}$ for neutron-rich Co isotopes.
Kota V. K. B.
Srivastava P. C.
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