Competing proton and neutron rotational alignments: Band structures in Ba131

R. Ma, Y. Liang, E. S. Paul, N. Xu, D. B. Fossan, L. Hildingsson, R. A. Wyss

Research output: Contribution to journalArticle

29 Scopus citations


High-spin states in the odd-neutron Ba131 nucleus have been populated following the Sn122(13C,4n) reaction. Several rotational bands were established using - coincidence techniques. The yrast band, built on a h11/2 orbital, has a relatively large signature splitting (160 keV). Cranking calculations suggest a significant triaxial shape with 0°for this configuration. A pair of h11/2 protons align at a rotational frequency Latin small letter h with stroke0.43 MeV and drive the nucleus towards a near-prolate shape (0°), which is manifest by the observation of a I=1 band with strong dipole transitions and a small signature inversion. At a similar frequency, pairs of h11/2 neutrons align and drive the nucleus to near-oblate (-60°) shapes, resulting in the observation of decoupled I=2 bands.

Original languageEnglish (US)
Pages (from-to)717-729
Number of pages13
JournalPhysical Review C
Issue number2
StatePublished - Jan 1 1990


ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Ma, R., Liang, Y., Paul, E. S., Xu, N., Fossan, D. B., Hildingsson, L., & Wyss, R. A. (1990). Competing proton and neutron rotational alignments: Band structures in Ba131. Physical Review C, 41(2), 717-729.