Shell model at GAMMASPHERE: Studies in the A {approx} 96 region

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:231334

Garg, U; Ghugre, S S; Kharraja, B ^[1]

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1. Notre Dame Univ., IN (United States). Dept. of Physics; and others

High-spin states in {sup 94,95}Mo, {sup 94,95,96}Tc, {sup 96,97,98}Ru and {sup 97,98}Rh were populated via the {sup 65}Cu({sup 36}S, xpyn) reactions at 142 MeV. We have observed about 300 new transitions belonging to these nuclei, and their level schemes have been extended up to a spin of J {approx} 20{h_bar} and an excitation energy of E{sub x} {approx} 12--14 MeV. Information on the high spin structure for {sup 96}Tc and {sup 98}Rh has been obtained for the first time. Spherical shell model calculations have been performed and compared with the experimental excitation energies. The level structures of the N = 51,52 isotones exhibit single-particle nature, even at high spins and excitation energies (J {approx} 20{h_bar}, E{sub x} {approx} 12--14 MeV). A fragmentation of intensity into several branches after the breaking of the N = 50 core has been observed. There are indications for the onset of collectivity around neutron number N = 53 in this mass region. A sequence of E2 transitions, indicating an onset of the vibrational degree of freedom, was observed in {sup 98}Ru at spins just above the observed N = 50 core breaking.

• Research Organization: Argonne National Lab., IL (United States). Physics Div.; Tennessee Univ., Knoxville, TN (United States). Dept. of Physics
• Sponsoring Organization: USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: FG05-87ER40361; W-31109-ENG-38
• OSTI ID: 231334
• Report Number(s): ANL/PHY/CP--89517; CONF-951274--3; ON: DE96008458; CNN: PHY94-02761; PPA/DOE-93-153
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COPPER 65
COPPER 65 REACTIONS
HIGH SPIN STATES
ISOTONIC NUCLEI
MOLYBDENUM 94
MOLYBDENUM 95
RHODIUM 97
RHODIUM 98
RUTHENIUM 96
RUTHENIUM 97
RUTHENIUM 98
SHELL MODELS
SULFUR 36 TARGET
TECHNETIUM 94
TECHNETIUM 95
TECHNETIUM 96