Superdeformation in {sup 151}Gd

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Bulletin of the American Physical Society

OSTI ID:374923

Cederwall, B; Fallon,; Macchiavelli, A O ^[1]

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1. and others

The first observation of superdeformed (SD) states in the nucleus {sup 151}Gd is reported. Gamma rays emitted from {sup 130}Te({sup 26}Mg,xn) reactions at 149 MeV beam energy were studied using the Eurogam phase I detector array, yielding a wealth of information on SD states in {sup 150}Gd. The 5n-evaporation channel ({sup 151}Gd) was populated with roughly 30% intensity relative to the 6n channel ({sup 150}Gd). Still, no SD bands could in the first analysis be assigned to {sup 151}Gd. Given the success of mean field theories in predicting SD structures around A=150 and the fact that such calculations predict favored SD minima, in {sup 151}Gd (albeit less favored than in {sup 150}Gd) the lack of experimental evidence was challenging. An extended search for weak SD structures applied to the three-and higher-fold data using an automated search algorithm, enabled identification of three new SD bands. Isotopic assignment to {sup 151}Gd could be done based on coincidences with low-lying yrast transitions in this nucleus. One of the bands is assigned to the 7{sub 3} intruder orbital and the other two as a strongly coupled signature-partner pair built on the [402]5/2(or possibly the [514]9/2) Nilsson orbital. A comparison with SD structures in {sup 150}Gd provides interesting information on static neutron pair correlations in SD nuclei around A=150.

• OSTI ID: 374923
• Report Number(s): CONF-9304297--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 40; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ENERGY LEVELS
GADOLINIUM 151
GAMMA SPECTRA
SUPERDEFORMED NUCLEI