Rotational states in neutron-deficient /sup 139/Gd

Journal Article · Wed Feb 01 04:00:00 EST 1989 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.39.530· OSTI ID:6529793

Ma, R; Ahn, K; Liang, Y; Paul, E S; Xu, N; Fossan, D B

States have been established in the neutron-deficient /sup 139/Gd nucleus for the first time via the /sup 92/Mo(/sup 50/Cr,2pn..gamma..) reaction. Both ..gamma..-..gamma.. and ..gamma..-n coincidence techniques were employed. The yrast band, built on the ..nu..h/sub 11/2/(514)(9/2/sup -/ orbital, shows a signature splitting of approx.100 keV implying a significant triaxial shape. At a rotational frequency (h/2..pi..)..omega..approx.0.29 MeV a pair of h/sub 11/2/ quasiprotons align. Associated with this alignment are a decrease in the signature splitting, indicating a near-prolate nuclear shape, and an enhancement of the interband M1 transitions relative to the E2 crossovers, which is consistent with a mixed neutron-proton configuration. In addition, a tentative decoupled band showing the characteristics of a band theoretically expected for the ..beta..-driving ..nu..i/sub 13/2/ orbital was observed.

• Research Organization: Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794
• OSTI ID: 6529793
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 39:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651720* -- Nuclear Properties & Reactions
A=90-149
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
C CODES
CHROMIUM 50 TARGET
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
COMPUTER CODES
CROSS SECTIONS
E2-TRANSITIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
EXCITATION FUNCTIONS
EXCITED STATES
FERMIONS
FUNCTIONS
GADOLINIUM 139
GADOLINIUM ISOTOPES
GAMMA RADIATION
HADRONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
M1-TRANSITIONS
MEV RANGE
MEV RANGE 100-1000
MOLYBDENUM 92 TARGET
MULTIPOLE TRANSITIONS
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PARITY
PARTICLE PROPERTIES
PROTONS
QUASI PARTICLES
RADIATIONS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
ROTATIONAL STATES
SPIN
TARGETS
YRAST STATES