New band structures and an unpaired crossing in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>78</mn></mrow></msup></mrow><mi mathvariant="normal">Kr</mi></math></span>

H. Sun; J. Döring; G. D. Johns; R. A. Kaye; G. Z. Solomon; S. L. Tabor; M. Devlin; D. R. LaFosse; F. Lerma; D. G. Sarantites; C. Baktash; D. Rudolph; C.-H. Yu; I. Y. Lee; A. O. Macchiavelli; I. Birriel; J. X. Saladin; D. F. Winchell; V. Q. Wood; I. Ragnarsson

doi:10.1103/PhysRevC.59.655

New band structures and an unpaired crossing in $^{78} Kr$

H. Sun, J. Döring, G. D. Johns, R. A. Kaye, G. Z. Solomon, S. L. Tabor, M. Devlin, D. R. LaFosse, F. Lerma, D. G. Sarantites, C. Baktash, D. Rudolph, C.-H. Yu, I. Y. Lee, A. O. Macchiavelli, I. Birriel, J. X. Saladin, D. F. Winchell, V. Q. Wood, and I. Ragnarsson

Phys. Rev. C 59, 655 – Published 1 February 1999

Abstract

High-spin states in $^{78} Kr$ were studied using the $^{58} Ni (^{23} Na, 3 p)$ reaction at 70 MeV and the $^{58} Ni (^{28} Si, α 4 p)$ reaction at 130 MeV. Prompt $γ - γ$ coincidences were measured using the Pitt-FSU detector array and the GAMMASPHERE-MICROBALL array. Results from these experiments have led to 26 new excitation levels, some of which have been grouped into 3 new bands. Spins were assigned based on directional correlations of oriented nuclei. Two of the new negative-parity bands appear to form a signature-partner pair based on a two-quasineutron structure, in contrast to the previously known two-quasiproton negative-parity bands. A forking has been observed at the $24^{+}$ state in the yrast band, which calculations suggest may result from an unpaired crossing. The available evidence suggests oblate shapes in the yrast band coexist with prolate shapes in the negative-parity bands.

Received 6 July 1998

DOI:https://doi.org/10.1103/PhysRevC.59.655

Authors & Affiliations

H. Sun^1,*, J. Döring^1,2, G. D. Johns^1,†, R. A. Kaye^1,‡, G. Z. Solomon¹, S. L. Tabor¹, M. Devlin³, D. R. LaFosse³, F. Lerma³, D. G. Sarantites³, C. Baktash⁴, D. Rudolph^4,§, C.-H. Yu⁴, I. Y. Lee⁵, A. O. Macchiavelli⁵, I. Birriel⁶, J. X. Saladin⁶, D. F. Winchell⁶, V. Q. Wood⁶, and I. Ragnarsson⁷

¹Department of Physics, Florida State University, Tallahassee, Florida 32306
²Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
³Department of Chemistry, Washington University, St. Louis, Missouri 63130
⁴Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
⁵Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
⁶Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
⁷Department of Mathematical Physics, Lund Institute of Technology, S-22100 Lund, Sweden

^*Permanent address: Department of Physics, Jilin University, Changchun, Jilin 130023, People’s Republic of China.
^†Present address: Los Alamos National Laboratory, Los Alamos, NM 87545.
^‡Present address: Physics Division, Argonne National Laboratory, Argonne, IL 60439.
^§Present address: Department of Physics, Lund University, S-22100 Lund, Sweden.

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Vol. 59, Iss. 2 — February 1999

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