{alpha}-decay rates of {sup 180,182,184}Pb and the Z=82 shell closure

Journal Article · Thu Jul 01 04:00:00 EDT 1999 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.60.011302· OSTI ID:351911

Toth, K S; Bingham, C R ^[1]; Bingham, C R; Wauters, J ^[2]; Batchelder, J C; Zganjar, E F ^[3]; Batchelder, J C ^[4]; Brown, L T; Conticchio, L F; Davids, C N; Seweryniak, D ^[5]; Brown, L T ^[6]; Conticchio, L F; Seweryniak, D; Walters, W B ^[7]; Irvine, R J ^[8]; Moltz, D M ^[9]

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1. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
2. The University of Tennessee, Knoxville, Tennessee 37996 (United States)
3. Louisiana State University, Baton Rouge, Louisiana 70803 (United States)
4. UNIRIB, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831 (United States)
5. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
6. Vanderbilt University, Nashville, Tennessee 37235 (United States)
7. University of Maryland, College Park, Maryland 20742 (United States)
8. Edinburgh University, Edinburgh, EH9 3JZ (United Kingdom)
9. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

The proton-rich isotopes {sup 180}Pb, {sup 182}Pb, and {sup 184}Pb were produced in {sup 92}Mo bombardments of {sup 90}Zr, {sup 92}Zr, and {sup 94}Zr, respectively, and their {alpha}-decay properties were investigated with the use of a fragment mass analyzer and a double-sided Si strip detector. These data yielded unambiguous identifications of {sup 180}Pb and {sup 182}Pb and half-lives for all three Pb nuclei that are more precise than previously available values. An examination of {alpha} reduced widths in the Pb mass region leads to the conclusion that the Z=82 shell gap is greatly reduced for neutron numbers midway between 82 and 126. Available mass data, manifested in {Delta}Q{sub {alpha}} values and two-proton separation energies of even-even nuclei with the same neutron numbers, support this conclusion. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 351911
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 60; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALPHA DECAY
HALF-LIFE
LEAD ISOTOPES
MOLYBDENUM 92
SHELL MODELS
ZIRCONIUM ISOTOPES