Ab initio Monte Carlo shell model calculations for Li-7 and Li-9 low-lying spectra

作者：Liu Lang^*

来源：Chinese Physics C, 2015, 39(6): 064101.

DOI：10.1088/1674-1137/39/6/064101

• Monte Carlo shell model
• unitary correlation operator method
• ab initio
• Li-7,Li-9

The low-lying spectra of Li-7 and Li-9 are investigated within an ab initio Monte Carlo Shell Model (MCSM) employing a realistic potential obtained via the Unitary Correlation Operator Method (UCOM). The MCSM calculations in a 4-major-shells model space for the binding energy and mass quadrupole moment of Li-7,Li-9 show good convergence when the MCSM dimension reaches 20. The excitation energy of the J(pi) = 1/2(-) state for Li-7 and the magnetic moments for Li-7,Li-9 ground states in the MCSM with a treatment of spurious center-of-mass motion are close to the experimental data. Correct level ordering of J(pi)=3/2(-) and 1/2(-) states for Li-7,Li-9 can be reproduced due to the inclusion of three-body correlations in the MCSM+UCOM. However, the excitation energy of J(pi)=1/2(-) state for Li-9 is not reproduced in the MCSM mainly due to the lack of larger model space.

• 出版日期2015-6
• 单位江南大学