Physical Review C, Nuclear Physics
Author:
Keywords:
Science & Technology, Physical Sciences, Physics, Nuclear, Physics, BETA-DECAY, MODEL, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 5106 Nuclear and plasma physics
Abstract:
The nucleus 31 P has been studied in the 24 Mg( 16 O,2 αp ) reaction with a 70-MeV 16 O beam. A complex level scheme extended up to spins 17/2 + and 15/2 − , on positive and negative parity, respectively, has been established. Lifetimes for the new states have been investigated by the Doppler shift attenuation method. Two shell-model calculations have been performed to describe the experimental data, one by using the code ANTOINE in a valence space restricted to the sd shell, and the other by applying the Monte Carlo shell model in a valence space including the sd - fp shells. The latter calculation indicates that intruder excitations, involving the promotion of a T = 0 proton-neutron pair to the fp shell, play a dominant role in the structure of the positive-parity high-spin states of 31 P.