Excitation energy of the {pi}{ital s}{sub 1/2} intruder state in {sup 189}Bi

Journal Article · Sun Oct 01 00:00:00 EDT 1995 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.52.1807· OSTI ID:118479

Batchelder, J C; Toth, K S; Moltz, D M; Ognibene, T J; Rowe, M W; Bingham, C R; Zganjar, E F; Zimmerman, B E ^[1]

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1. Louisiana State University, Baton Rouge, Louisiana 70803 (United States)

In a series of {sup 48}Ti bombardments of {sup 144}Sm the decay energy of the {sup 189}Bi{sup {ital m}} ({pi}{ital s}{sub 1/2}) {alpha} transition that proceeds to the ({pi}{ital s}{sub 1/2}) ground state of {sup 185}Tl was measured to be 7.30(4) MeV. This result establishes the excitation energy of {sup 189}Bi{sup {ital m}} as 190(40) keV rather than the adopted 92(10)-keV value. Our data indicate a leveling off in excitation energy at {ital N}{approx}106 for the {ital s}{sub 1/2} intruder state in the odd-{ital A} Bi isotopes rather than a continued drop at that neutron number as inferred by Coenen {ital et} {ital al}. in their discussion of intruder state systematics in the Pb region. Consequences of this discrepancy for the adopted excitation energy of the {pi}{ital s}{sub 1/2} isomer in {sup 187}Bi are discussed.

• DOE Contract Number: FG05-84ER40159; AC05-84OR21400; AC03-76SF00098; FG05-87ER40361
• OSTI ID: 118479
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 4 Vol. 52; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BISMUTH 189
BISMUTH ISOTOPES
ENERGY
EXCITATION
GROUND STATES
THALLIUM 185