Approaching the Island of Inversion: $^{34}$P
ORAL
Abstract
Yrast states in $^{34}$P were investigated using the $^{18}$O($^{18}$O,pn) reaction at energies of 20, 24, 25, 30, and 44 MeV at Florida State University and at Lawrence Berkeley National Laboratory. The level scheme was expanded, $\gamma$-ray angular distributions were measured, and lifetimes were inferred with the Doppler-shift attenuation method by detecting decay protons in coincidence with one or more $\gamma$ rays. The results provide a clearer picture of the evolution of structure approaching the ``Island of Inversion'', particularly how the 1 and 2 particle-hole (ph) states fall in energy with increasing neutron number approaching inversion. Shell model calculations made using a small modification of the WBP interaction reproduce the negative-parity, 1-ph states rather well.
*Supported in part by the NSF and DOE.
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