Intruder levels and vibrational modes in the SD-PAIR shell model

Yan A.N. Luo, Liaoning Normal University
Feng Pan, Liaoning Normal University
Ping Zhi Ning, Nankai University
J. P. Draayer, Louisiana State University


The influence of the intruder level on vibrational modes in atomic nuclei is examined within the framework of the nucleon-pair shell model truncated to a SD-subspace. The vibrational character of the spectra is found to depend upon the size of the active model space and not on the parity of the populated levels. © World Scientific Publishing Company.