Radioactivity of neutron deficient isotopes in the region {ital N}{approx_gt}82{approx_gt}{ital Z}
- Department of Physics and Astronomy, University of Edinburgh, The Kings Buildings, Edinburgh EH9 3JZ (United Kingdom)
The {alpha} decay characteristics of 88 decay lines emanating from 74 isotopes are presented, including new {alpha} decay lines identified in the neutron deficient nuclides {sup 158}Ta ({ital E}{sub {alpha}}=5969{plus_minus}8 keV, {ital t}{sub 1/2}=46{plus_minus}4 ms), {sup 159}Ta ({ital E}{sub {alpha}}=5516{plus_minus}5 keV, {ital t}{sub 1/2}=1100{plus_minus}100 ms), {sup 160}Ta ({ital E}{sub {alpha}}=5313{plus_minus}5 keV, {ital t}{sub 1/2}=1700{plus_minus}200 ms), {sup 168}Ir ({ital E}{sub {alpha}}=6323{plus_minus}8 keV, {ital t}{sub 1/2}=161{plus_minus}21 ms, {ital b}{sub {alpha}}=82{plus_minus}14{percent}), and {sup 170}Ir ({ital E}{sub {alpha}}=6083{plus_minus}11 keV, {ital t}{sub 1/2}=830{plus_minus}300 ms, {ital b}{sub {alpha}}=36{plus_minus}10{percent}). Their correlations with other decay lines are discussed. The alpha decay of a high-spin isomer in {sup 157}Ta has been discovered, with an energy of 7744{plus_minus}8 keV and a half-life of 1.7{plus_minus}0.1 ms, while the half-life of the corresponding isomeric alpha decay line of {sup 158}W has been measured for the first time as 160{plus_minus}50 {mu}s. First half-life and branching ratio measurements are also reported for the 5454{plus_minus}4 keV {sup 156}Lu line ({ital t}{sub 1/2}=494{plus_minus}12 ms), {sup 162}Re ({ital b}{sub {alpha}}=85{plus_minus}9{percent}), {sup 163}Os ({ital t}{sub 1/2}=12{sub {minus}7}{sup +11} ms), {sup 166}Ir ({ital t}{sub 1/2}=12{plus_minus}1 ms), {sup 167}Ir ({ital t}{sub 1/2}=34{plus_minus}4 ms), the 6227{plus_minus}15 keV {sup 168}Ir line ({ital t}{sub 1/2}=125{plus_minus}40 ms), and {sup 171}Ir ({ital b}{sub {alpha}}=58{plus_minus}11{percent}). New decay measurements for the proton emitter {sup 156}Ta ({ital E}{sub {ital p}}=1108{plus_minus}8 keV, {ital t}{sub 1/2}=375{plus_minus}54 ms, {ital b}{sub {ital p}}=4.2{plus_minus}0.9{percent}; {ital E}{sub {ital p}}=1007{plus_minus}5 keV, {ital t}{sub 1/2}=144{plus_minus}24 ms) are presented. (Abstract Truncated)
- OSTI ID:
- 278833
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 53; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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