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arXiv 1004.4443nucl-th
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$^{61,63,65}$ Co同位素在$fp$和${fpg_{9/2}}$空间的壳模型结果

Shell-model results in $fp$ and ${fpg_{9/2}}$ spaces for $^{61,63,65}$Co isotopes

P. C. Srivastava, V. K. B. Kota

摘要:

在两种不同的壳模型空间中计算了$^{61,63,65}$ Co的奇-偶同位素的低激发能谱和几种高自旋态。第一组计算已经在${fp}$壳价空间($^{63,65}$ Co的全$fp$空间和$^{61}$ Co的截短的$fp$空间)中进行,使用两个最近衍生的${fp}$壳相互作用,即GXPF 1A和KB 3G,以$^{40}$ Ca为核。类似地,第二组计算已经在${fpg_{9/2}}$价空间中使用由于Sorlin { \it等人}的${fpg}$有效相互作用进行,以$^{48}$ Ca为核心并进行截短。对于$^{61,63}$ Co,壳模型的结果表明所采用的${fpg}$相互作用是不够的,同时指出对于富中子的Co同位素,有必要考虑比$1g_{9/2}$更高的轨道.

英文摘要:

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.

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