Behavior of intruder based states in light Bi and Tl isotopes: the study of {sup 187 Bi} {alpha} decay

Conference · Wed Jan 01 04:00:00 EST 1997

OSTI ID:432873

Batchelder, J C; Zganjar, E F ^[1]

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1. Louisiana State Univ., Baton Rouge, LA (United States)

Intruder state excitation energies in odd-mass nuclei just outside a closed proton shell plotted versus neutron number generally exhibit parabola-shaped curves with minima near neutron mid-shells. The Bi isotopes, however, do not seem to follow this trend. Recent experiments performed at Argonne National Laboratory have identified the previously unobserved {sup 187}Bi ground state (h{sub 9/2}) to {sup 183}TI ground state s{sub 1/2} {alpha} transition. Its energy when combined with those of two earlier known transitions, namely {sup 187}Bi (h{sub 9/2}) {yields} {sup 183m}Tl (h{sub 9/2}) and {sup 187m}Bi (s{sub 1/2}) {yields} {sup 183}Tl(s{sub 1/2}), establishes the excitation energies of the {sup 183m}Tl and {sup 187m}Bi to be 620(20) keV and 110(20) keV, respectively. This value for {sup 187m}Bi is 80 keV lower than the excitation energy of the same intruder level in {sup 189}Bi. Implications of this result with respect to intruder-state systematics are discussed.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC05-96OR22464; FG05-84ER40159; W-31109-ENG-38; FG05-88ER40418; FG05-87ER40361
• OSTI ID: 432873
• Report Number(s): CONF-961110--12; ON: DE97000322
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALPHA DECAY
BISMUTH ISOTOPES
EXCITATION
HALF-LIFE
METASTABLE STATES
NUCLEAR FORCES
NUCLEAR POTENTIAL
SHELL MODELS
THALLIUM 183