Odd-even147−153Pm isotopes within the neutron-proton interacting boson-fermion model

Abstract

Low-lying energy states of the 147−153 Pm isotopic chain are studied within the framework of the neutron-proton interacting boson-fermion model (IBFM-2). The spectra of these isotopes show a transition from a particle coupled to a vibrational core to a particle coupled to a deformed one. The calculation reproduces this behavior. In addition, reduced transition probabilities B(E2) and B(M1) and quadrupole and magnetic moments, as well as spectroscopic factors corresponding to stripping and pickup transfer reactions, are calculated. Obtained results compare well with the available experimental data, which reinforces the reliability of the wave functions obtained within the IBFM-2 model.

Ground-state phase transition in odd-Aand odd-odd nuclei nearN=90

“…It is of practical importance to investigate the characters of the shape phase transitions modulated by the finiteness of the system [11]. Currently, most experimental and theoretical studies on shape phase transitions in nuclei focus on even-even systems [1][2][3][4][5][6][7][8][9][11][12][13][14][15][16][17][18][19][20][21]23,[26][27][28][29][30][31][32][33][34], except for a few theoretical discussions [35][36][37][38][39][40][41][42] about odd-A nuclei. The purpose of this work is to investigate the characters of the ground-state phase transition in odd-A and odd-odd nuclei around N = 90.…”

The one nucleon transfer operator in the microscopic IBM without NOA

“…[19] within the IBFM. There, details on the IBFM parameters and the full calculation for the even-even 60 Nd core isotopes and the odd-even 61 Pm isotopes are given.…”

“…This will be done in the next section by using realistic wavefunctions already obtained in Ref. [19] for Nd, Sm and Pm isotopes. However, a consistent approach will require the microscopic rederivation of the boson-fermion interaction in the IBFM starting with this one-nucleon creation operator.…”