Systematics of even-even T{sub z}= 1 nuclei in the A= 80 region: High-spin rotational bands in {sup 74}Kr, {sup 78}Sr, and {sup 82}Zr

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.56.98· OSTI ID:664424

Rudolph, D; Baktash, C; Gross, C J; Jin, H; Yu, C H ^[1]; Rudolph, D ^[2]; Gross, C J ^[3]; Satula, W ^[4]; Satula, W ^[5]; Satula, W ^[6]; Wyss, R ^[7]; Birriel, I; Saladin, J X; Winchell, D F; Wood, V Q ^[8]; Devlin, M; LaFosse, D R; Lerma, F; Sarantites, D G ^[9]; Sylvan, G N ; Tabor, S L ^[10]

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1. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
2. Sektion Physik der Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching (Germany)
3. Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831 (United States)
4. Department of Physics, University of Tennessee, Knoxville, Tennessee 37996 (United States)
5. Joint Institute for Heavy Ion Research, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
6. Institute of Theoretical Physics, Warsaw University, PL-00681 Warsaw (Poland)
7. The Royal Institute of Technology, Physics Department Frescati, S-104 05 Stockholm (Sweden)
8. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)
9. Chemistry Department, Washington University, St. Louis, Missouri 63130 (United States)
10. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)

High-spin states of T{sub z}=1 nuclei were studied with the reactions {sup 58}Ni({sup 28}Si,3{alpha}){sup 74}Kr, {sup 58}Ni({sup 28}Si,2{alpha}){sup 78}Sr, and {sup 58}Ni({sup 28}Si,2p2n){sup 82}Zr at 130 MeV beam energy. The Gammasphere array in conjunction with the 4{pi} charged-particle detector array Microball was used to detect {gamma} rays in coincidence with evaporated light charged particles. The known {pi}=+, {alpha}=0 yrast bands were extended to I=28{h_bar} at 20 MeV excitation energy. For all three nuclei, a number of positive- and negative-parity sidebands were established; altogether 15 new rotational bands were found. The data are discussed using the pairing-and-deformation self-consistent total Routhian surface (TRS) model: High-spin structures of {sup 74}Kr and {sup 78}Sr are governed by the shell gaps at large prolate deformation while {sup 82}Zr seems to exhibit shape coexistence. Nearly identical bands were established which may be explained as arising from the fp orbits acting as spectators at very elongated shapes. The experimental data in these T{sub z}=1 nuclei are in good agreement with predictions of the TRS model using conventional T=1 like-nucleon pairing correlations. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Oak Ridge Institute of Science and Education
• DOE Contract Number: AC05-76OR00033; AC05-96OR22464; FG02-96ER40963; FG05-87ER40361; FG02-88ER40406
• OSTI ID: 664424
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 56; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALPHA PARTICLES
CHARGED PARTICLES
COINCIDENCE METHODS
CORRELATIONS
DEFORMATION
EVAPORATION
EXCITATION
GAMMA RADIATION
HIGH SPIN STATES
KRYPTON 74
NEUTRONS
NICKEL 58 REACTIONS
PARITY
PROTONS
ROTATIONAL STATES
SILICON 28 TARGET
STRONTIUM 78
YRAST STATES
ZIRCONIUM 82