The low-lying spectra of7 Li and9Li 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 calculati...The low-lying spectra of7 Li and9Li 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 of7, 9Li show good convergence when the MCSM dimension reaches 20. The excitation energy of the Jπ= 1/2-state for7 Li and the magnetic moments for7, 9Li ground states in the MCSM with a treatment of spurious center-of-mass motion are close to the experimental data. Correct level ordering of Jπ=3/2-and 1/2-states for7, 9Li can be reproduced due to the inclusion of three-body correlations in the MCSM＋UCOM. However, the excitation energy of Jπ=1/2-state for9 Li is not reproduced in the MCSM mainly due to the lack of larger model space.展开更多
基金Supported by Fundamental Research Funds for the Central Universities(JUSRP1035)National Natural Science Foundation of China(11305077)
文摘The low-lying spectra of7 Li and9Li 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 of7, 9Li show good convergence when the MCSM dimension reaches 20. The excitation energy of the Jπ= 1/2-state for7 Li and the magnetic moments for7, 9Li ground states in the MCSM with a treatment of spurious center-of-mass motion are close to the experimental data. Correct level ordering of Jπ=3/2-and 1/2-states for7, 9Li can be reproduced due to the inclusion of three-body correlations in the MCSM＋UCOM. However, the excitation energy of Jπ=1/2-state for9 Li is not reproduced in the MCSM mainly due to the lack of larger model space.
