Observation of both h112 proton and neutron alignments in Pm139

N. Xu, C. W. Beausang, E. S. Paul, W. F. Piel, P. K. Weng, D. B. Fossan, E. Gülmez, J. A. Cizewski

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


The level structure of Pm139 has been investigated. The yrast band, based on a decoupled h112 proton orbital, was observed up to J=592-. A sharp backbend with a surprisingly large gain in alignment i=14 was observed at a frequency =0.43 MeV. This large increase in alignment, which is twice that observed in the Pm137 isotope, is due to the simultaneous alignment of both a pair of h112 protons and h112 neutrons. A J=1 sideband based on the neutron-aligned configuration h112(h112)2 with a large negative deformation (-60°) was also observed. The observation of both h112 and h112 alignments is consistent with cranked-shell model calculations.

Original languageEnglish (US)
Pages (from-to)1649-1652
Number of pages4
JournalPhysical Review C
Issue number4
StatePublished - 1987

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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