Abstract
The available experimental information on P has been greatly increased through the analysis of decays in coincidence with protons from the interaction of an O beam at 24 MeV with an O target. Light charged particles from the reaction were detected with Microball, and multiple -ray coincidences with Gammasphere. Many observed transitions have been identified and placed in the level scheme. Additionally, for most states, spins have been assigned based on measured -ray angular distributions while parities were inferred from lifetimes determined through Doppler-broadened line-shape analysis. Most of the states observed have been interpreted in terms of shell-model calculations using the WBP-a and SDPF-NR interactions having one particle in the or orbital. The two calculations agree almost equally well with the data resulting in root-mean-square differences of about 200 keV. However, a few high-lying states observed with long lifetimes challenge current calculations. Two of these may be associated with stretched states, but the calculations overpredict their energies by 2–3 MeV. Furthermore, a long-lived 7919-keV state is established for which no explanation is available at present.
- Received 31 January 2012
DOI:https://doi.org/10.1103/PhysRevC.85.044305
©2012 American Physical Society