New proton radioactivities {sup 165,166,167}Ir and {sup 171}Au

Journal Article · Thu May 01 04:00:00 EDT 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.55.2255· OSTI ID:496847

Davids, C N; Blumenthal, D J; Brown, L T; Henderson, D J; Penttilae, H T; Seweryniak, D ^[1]; Woods, P J; Davinson, T; Irvine, R J; Page, R D ^[2]; Batchelder, J C ^[3]; Bingham, C R; Zimmerman, B E ^[4]; Bingham, C R; Toth, K S ^[5]; Brown, L T ^[6]; Busse, B C ^[7]; Conticchio, L F; Penttilae, H T; Seweryniak, D ; Walters, W B ^[8]; Freeman, S J ^[9]

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1. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. University of Edinburgh, Edinburgh (United Kingdom)
3. Louisiana State University, Baton Rouge, Louisiana 70803 (United States)
4. University of Tennessee, Knoxville, Tennessee 37996 (United States)
5. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
6. Vanderbilt University, Nashville, Tennessee 37235 (United States)
7. Oregon State University, Corvallis, Oregon 97331 (United States)
8. University of Maryland, College Park, Maryland 20742 (United States)
9. University of Manchester, Manchester (United Kingdom)

The new proton radioactivities {sup 165,166,167}Ir and {sup 171}Au have been observed. The Ir isotopes were produced {ital via} the {sup 92}Mo({sup 78}Kr,pxn){sup 165,166,167}Ir reactions at 357 and 384 MeV. {sup 171}Au was produced {ital via} the {sup 96}Ru({sup 78}Kr,p2n){sup 171}Au reaction at 389 MeV. The proton emitters were each identified by position, time, and energy correlations between the implantation of a residual nucleus into a double-sided silicon strip detector, the observation of a decay proton, and the subsequent observation of a decay alpha particle from the daughter nucleus ({sup 164,165,166}Os and {sup 170}Pt, respectively). Both {sup 166}Ir and {sup 167}Ir have proton-emitting ground and isomeric states, which also decay by alpha emission. The proton-decay rates have been reproduced by calculations using the WKB barrier penetration approximation and a low-seniority shell-model calculation of the spectroscopic factors. The alpha decays of the four nuclei are followed by chains of alpha decays, allowing the determination of single-particle orbital orderings. Mass information has also been obtained from the alpha-decay chains because a connection to a known mass can be obtained for one of the nuclei. Ground-state mass excesses are reported for {sup 151}Tm, {sup 154}Yb, {sup 155}Lu, {sup 158}Hf, {sup 159}Ta, {sup 162}W, {sup 163}Re, {sup 166}Os, {sup 167}Ir, and {sup 170}Pt. The mass excess for {sup 171m}Au is also given. Proton separation energies are also deduced for the odd-Z alpha daughter nuclei of the Ir proton emitters. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 496847
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 5 Vol. 55; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALPHA DECAY
GOLD ISOTOPES
GROUND STATES
HAFNIUM 158
HEAVY ION REACTIONS
IRIDIUM 166
IRIDIUM 167
IRIDIUM ISOTOPES
ISOMERS
KRYPTON 78
LUTETIUM 155
MASS
MOLYBDENUM 92 TARGET
OSMIUM 166
PLATINUM 170
PROTON-EMISSION DECAY
RADIOACTIVITY
RHENIUM 163
SHELL MODELS
TANTALUM 159
THULIUM 151
TUNGSTEN 162
WKB APPROXIMATION
YTTERBIUM 154