Yrast transition strengths and band structure of /sup 75/Br

Journal Article · Fri Mar 01 04:00:00 EST 1985 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.31.828· OSTI ID:5920593

Luehmann, L; Debray, M; Lieb, K P; Nazarewicz, W; Woermann, B; Eberth, J; Heck, T

High spin states in /sup 75/Br were investigated in the reactions /sup 62/Ni(/sup 16/O,p2n) and /sup 66/Zn(/sup 12/C,p2n). By means of ..gamma gamma..- and ..gamma..-neutron multiplicity coincidence measurements, rotational bands of both parities were extended up to 7 MeV excitation energy and spin I = (33/2). The lifetimes of 17 yrast states were determined with the recoil distance and Doppler shift attenuation methods; the spin dependence of the side feeding time was also measured. The data have been analyzed in terms of the Strutinsky-Bogolyubov cranking model with a Woods-Saxon average potential. The first crossing observed in the negative parity bands is attributed to the alignment of a g/sub 9/2/ proton pair; the next irregularity which is also observed in the positive parity band is interpreted as the alignment of g/sub 9/2/ neutrons. The coexistence of prolate and oblate configurations at low spin and the change of nonaxial deformation with rotational frequency due to the polarization of the even-even core by the odd particle are discussed. The signature inversion visible in the negative parity bands as well as the changes in the signature splitting and reduction of B(E2) values at high spins may be related to a transition from ..gamma..<0/sup 0/ to ..gamma..>0/sup 0/ triaxial shapes.

• Research Organization: II. Physikalisches Institut, Universitat Goettingen, D-3400 Goettingen, Federal Republic of Germany
• OSTI ID: 5920593
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 31:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BAND THEORY
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BROMINE 75
BROMINE ISOTOPES
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
DATA
DOPPLER EFFECT
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FERMIONS
GAMMA RADIATION
HADRONS
HEAVY ION REACTIONS
HIGH SPIN STATES
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
LIFETIME
MULTIPLICITY
NEUTRONS
NICKEL 62 TARGET
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
ODD-EVEN NUCLEI
OXYGEN 16 REACTIONS
PARITY
PARTICLE PROPERTIES
POTENTIALS
RADIATIONS
RADIOISOTOPES
ROTATIONAL STATES
SPIN
TARGETS
WOODS-SAXON POTENTIAL
YRAST STATES
ZINC 66 TARGET