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arXiv 0810.2363nucl-th
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$^{17}$ C和$^{21}$ Ne中可能的形状共存和磁偶极跃迁

Possible Shape Coexistence and Magnetic Dipole Transitions in $^{17}$C and $^{21}$Ne

H. Sagawa, X. R. Zhou, Toshio Suzuki, N. Yoshida

摘要:

利用壳模型和形变Skyrme Hartree-Fock+阻塞BCS波函数,研究了N=11核、$^{17}$ C和$^{21}$ Ne的磁偶极(M1)跃迁.壳模型计算很好地预测了$^{21}$ Ne的能谱和磁偶极跃迁,而对$^{17}$ C的能谱和磁偶极跃迁的预测则很差。在形变HF计算中,两个核的基态都显示出接近于$β_2$ =0.4的大的长扁形变。同时指出,在$^{21}$ Ne中的第一$K^π=1/2^+$态是扁长形变的,而在$^{17}$ C中的第一$K^π=1/2^+$态是扁长形变的,其能量接近基态。我们指出,实验观察到的$^{17}$ C中的$I^π=1/2^+$和$3/2^+$之间的M1跃迁的大阻碍可以归因于$^{17}$ C在基态附近的形状共存。

英文摘要:

Magnetic dipole(M1) transitions of N=11 nuclei, $^{17}$C and $^{21}$Ne are investigated by using shell model and deformed Skyrme Hartree-Fock+blocked BCS wave functions. Shell model calculations predict well observed energy spectra and magnetic dipole transitions in $^{21}$Ne, while the results are rather poor to predict these observables in $^{17}$C. In the deformed HF calculations, the ground states of two nuclei are shown to have large prolate deformations close to $β_2$=0.4. It is also pointed out that the first $K^π=1/2^+$ state in $^{21}$Ne is prolately deformed, while the first $K^π=1/2^+$ state in $^{17}$C is predicted to have a large oblate deformation being close to the ground state in energy, We point out that experimentally observed large hindrance of M1 transition between $I^π=1/2^+$ and $3/2^+$ in $^{17}$C can be attributed to a shape coexistence near the ground state of $^{17}$C.

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