Intruder configurations in neutron-rich<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">P</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>34</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>
Abstract
Extensions to the yrast and near-yrast decay sequences of the neutron-rich nucleus ${}_{15}^{34}{P}_{19}$ have been established through an analysis of the $\ensuremath{\gamma}$ deexcitation of fragments produced in deep-inelastic processes which occur when $230\ensuremath{-}\mathrm{MeV}\phantom{\rule{0.3em}{0ex}}^{36}\mathrm{S}$ ions interact with a thick target of $^{176}\mathrm{Yb}$. The highly sensitive GASP array of escape-suppressed Ge detectors was used to measure the resulting $\ensuremath{\gamma}$-ray deexcitations of both projectilelike and targetlike fragments. Previously unobserved excited states in $^{34}\mathrm{P}$ were observed at 3351, 6236, 2320, and (4723) keV. Several states above an excitation energy of 2.3 MeV involve intruder configurations from the ${f}_{7/2}$ shell. The investigation of negative parity intruder states on the periphery of the ``island of inversion'' has an important role to play in our understanding of the evolution of nuclear structure as the island of inversion is approached.