Level structures of {sup 96,97,98}Ru at high angular momentum

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.57.83· OSTI ID:565955

Kharraja, B; Ghugre, S S; Garg, U ^[1]; Janssens, R V; Carpenter, M P; Crowell, B; Khoo, T L; Lauritsen, T; Nisius, D ^[2]; Reviol, W; Mueller, W F; Riedinger, L L ^[3]; Kaczarowski, R ^[4]

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1. Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
2. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
3. Department of Physics, University of Tennessee, Knoxville, Tennessee 37996 (United States)
4. Soltan Institute for Nuclear Studies, 05-400 Swierk (Poland)

The high-spin level structures of {sup 96,97,98}Ru (Z=44) have been investigated using the {sup 65}Cu({sup 36}S,pxn){sup 96,97,98}Ru (x=4,3,2) reactions. About 130 new transitions have been observed and unambiguously placed in the decay schemes of these nuclei. The level schemes have been extended up to spin J{approx}22{endash} 34{h_bar}, and excitation energies E{sub x}{approx}20{minus}24 MeV. Spherical shell model calculations have been performed and theoretical level energies compared with experimental values. Calculations using {sup 88}Sr as the core give a reasonable agreement for the observed energy levels up to J{le}16{h_bar} (the maximum angular momentum possible within this restricted model space). The higher angular momentum states are dominated by the {nu}(g{sub 9/2}){sup {minus}1} configuration, associated with breaking of the N=50 core. The experimental indications for this `core breaking` are (i) the observation of {gamma} rays with energies E{sub {gamma}}{approx} 2 MeV at intermediate spins and (ii) the fragmentation of {gamma}-ray intensity into a number of branches. A cascade of E2 transitions of nearly equal transition energies has been observed in {sup 98}Ru after the core breaking (J{ge}16{h_bar}), possibly manifesting vibrational behavior. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 565955
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 57; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR MOMENTUM
COPPER 65 TARGET
ENERGY LEVELS
EXCITATION
FRAGMENTATION
HIGH SPIN STATES
NUCLEAR CASCADES
RUTHENIUM 96
RUTHENIUM 97
RUTHENIUM 98
SHELL MODELS
STRONTIUM 88
SULFUR 36 REACTIONS
VIBRATIONAL STATES