First observation of excited states in {sup 137}Te and the extent of octupole instability in the lanthanides

Journal Article · Sat Apr 01 00:00:00 EST 2000 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.61.041301· OSTI ID:20215880

Urban, W ^[1]; Korgul, A ^[1]; Rzaca-Urban, T ^[1]; Schulz, N ^[2]; Bentaleb, M ^[2]; Lubkiewicz, E ^[2]; Durell, J L ^[3]; Leddy, M J ^[3]; Jones, M A ^[3]; Phillips, W R ^[3]

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1. Institute of Experimental Physics, Warsaw University, ul.Hoza 69, 00-681 Warszawa, (Poland)
2. Institut de Recherches Subatomiques UMR7500, CNRS-IN2P3 et Universite Louis Pasteur, 67037 Strasbourg, (France)
3. Schuster Laboratory, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, (United Kingdom)

Excited states in {sup 137}Te, populated in spontaneous fission of {sup 248}Cm, were studied by means of prompt-{gamma} spectroscopy, using the EUROGAM2 multidetector array. This is the first observation of excited states in {sup 137}Te. The yrast excitations of {sup 137}Te are due to the three valence neutrons, occupying the {nu}f{sub 7/2} and {nu}h{sub 9/2} orbitals, similarly as observed in its heavier N=85 isotones. Systematic comparison of excited levels in the N=85 isotones shows inconsistencies in spin and parity assignments in {sup 139}Xe and {sup 141}Ba nuclei. The new data for {sup 137}Te do not confirm earlier suggestions that octupole correlations increase in the N=85 isotones, close to the Z=50 closed shell. (c) 2000 The American Physical Society.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• OSTI ID: 20215880
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 61, Issue 4; Other Information: PBD: Apr 2000; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
TELLURIUM 137
EXCITED STATES
SPONTANEOUS FISSION
CURIUM 248
GAMMA SPECTRA
YRAST STATES
SPIN
PARITY
OCTUPOLES
EXPERIMENTAL DATA