SHAPE COEXISTENCE IN SM-138 AND EVIDENCE FOR THE ROTATIONAL ALIGNMENT OF A PAIR OF N=6 NEUTRONS

E S Paul, R M Clark, C W Beausang, S A Forbes, A Gizon, J Gizon, K Hauschild, I M Hibbert, P J Nolan, D Santos, A T Semple, J Simpson, R Wadsworth, L Walker, J N Wilson

Research output: Contribution to journalArticlepeer-review

Abstract

The level scheme of Sm-138 has been extended up to I-pi = (32(+)) using gamma-ray coincidence data collected with the Eurogam array. The Cd-106(Cl-35,3p)Sm-138 fusion-evaporation reaction was used at a bombarding energy of 150 MeV. Several new bands have been observed and the known bands extended to higher spin. Band crossings and shape coexistence are discussed with the aid of Woods-Saxon cranking calculations (CMS and TRS). Evidence is presented for a neutron [i(13/2)](2) pair alignment which is predicted to drive the nucleus to a prolate shape with enhanced quadrupole deformation beta(2) = 0.32. A strongly coupled band was also established and is interpreted as a collectively rotating oblate structure.

Original languageEnglish
Pages (from-to)1405-1421
Number of pages17
JournalJournal of physics g-Nuclear and particle physics
Volume20
Issue number9
Publication statusPublished - Sept 1994

Keywords

  • LIFETIME MEASUREMENTS
  • MASS REGION
  • SUPERDEFORMED BANDS
  • 2ND MINIMUM
  • YRAST LINE
  • NUCLEI
  • INTRUDER
  • SPECTROSCOPY
  • DEFORMATION
  • CROSSINGS

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