Alpha decay of the h[sub 9/2] ground and s[sub 1/2] intruder states in light Bi and at isotopes

Conference · Tue Dec 01 04:00:00 EST 1998 · AIP Conference Proceedings

OSTI ID:6072666

Bingham, C R; Reviol, W; Wauters, J; Xu, X J ^[1]; Bingham, C R; Toth, K S ^[2]; Batchelder, J C ^[3]; Cizewski, J A; Davids, C N; Seweryniak, D; Uusitalo, J ^[4]; Cizewski, J A ^[5]; Irvine, R J ^[6]; Walters, W B ^[7]; Wood, J L ^[8]; Zganjar, E F ^[9]

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1. University of Tennessee, Knoxville, Tennessee 37996 (United States)
2. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
3. Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831 (United States)
4. Argonne National Laboratory, Chicago, Illinois 60439 (United States)
5. Rutgers University, Piscataway, New Jersey 08854 (United States)
6. University of Edinburgh, Edinburgh, EH9 3JZ (United Kingdom)
7. University of Maryland, College Park, Maryland 20742 (United States)
8. Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)
9. Louisiana State University, Baton Rouge, Louisiana 70803 (United States)

The 1/2[sup +] state in the odd-A Bi isotopes is interpreted as an intruder shell model state with one hole in the s[sub 1/2] level just below the Z=82 closed shell. Likewise, the 9/2[sup [minus]] state in the odd-A Tl isotopes is the intruder level corresponding to one proton in the otherwise empty shell above Z=82. These intruder states come quite low near the middle of the neutron shell and are observed as isomeric states. The positions of the intruding isomeric states as a function of the neutron number are important in understanding the shell model interactions producing the relative stability of the intruding states. In this region, the middle of the neutron shell is also quite far from stability, approaching the proton drip line, and hence, [alpha] emission is a dominant decay mode. In a series of [alpha]-decay fine structure measurements of Bi isotopes, the location of the s[sub 1/2] intruder level has been determined down to mass 187. The ground states of the odd-A At isotopes from [sup 197]At upward have been assigned a spin of 9/2[sup [minus]], but the expected 1/2[sup +] intruder state is still relatively unknown in these nuclei. In this paper we report our most recent results from the [alpha] decay of [sup 187]Bi, [sup 189]Bi, and [sup 191]Bi and show the systematic trend of these intruder states in Bi and Tl. [copyright] [ital 1998 American Institute of Physics.]

• DOE Contract Number: AC05-76OR00033; AC05-96OR22464; FG02-96ER40958; FG02-96ER40978; FG02-96ER40983; W-31109-ENG-38
• OSTI ID: 6072666
• Report Number(s): CONF-980672--
• Conference Information: Journal Name: AIP Conference Proceedings Journal Volume: 455:1
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663560 -- Nuclear Mass Ranges-- A=90-149-- (1992-)
663570 -- Nuclear Mass Ranges-- A=150-189-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY
ARGON 36 REACTIONS
ASTATINE
BISMUTH
BISMUTH ISOTOPES
CHARGED-PARTICLE REACTIONS
DECAY
ELEMENTS
ENERGY LEVELS
HALOGENS
HEAVY ION FUSION REACTIONS
HEAVY ION REACTIONS
HOLMIUM 165 TARGET
ISOTOPES
METALS
MOLYBDENUM 92 REACTIONS
MOLYBDENUM 96 TARGET
NONMETALS
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEOSYNTHESIS
SYNTHESIS
TARGETS
TERBIUM 159 TARGET