TY - JOUR
T1 - Decay studies of neutron deficient nuclei near the Z=64 subshell
T2 - Dy142, Tb140,142, Gd140,142, Eu140,142, Sm142, and Pm142
AU - Firestone, R. B.
AU - Gilat, J.
AU - Nitschke, J. M.
AU - Wilmarth, P. A.
AU - Vierinen, K. S.
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1991
Y1 - 1991
N2 - The electron-capture and +-decay branchings (EC/+) and delayed proton decays of A=142 isotopes with 61 Z 66 and A=140 isotopes with 63 Z 65 were investigated with the OASIS facility on-line at the Lawrence Berkeley Laboratory SuperHILAC. Electron capture and positron-decay emission probabilities have been determined for Pm142 and Sm142 decays, and extensive decay schemes have been constructed for Eug142(2.34±0.12 s), Gd142(70.2±0.6 s), Eu140(1.51±0.02 s), and Gd140(15.8±0.4 s). Decay schemes for the new isotopes Tbg142(597±17 ms), Tbm142(303±17 ms), Dy142(2.3±0.3 s), Eum140(125±2 ms), and Tb140(2.4±0.2 s) are also presented. We have assigned rays to these isotopes on the basis of and x coincidences, and from half-life determinations. Electron-capture and +-decay branchings were measured for each decay, and -delayed proton branchings were determined for Dy142, Tb142, and Tb140 decays. QEC values, derived from the measured EC/+ branchings and the level schemes are compared with those from the Wapstra and Audi mass evaluation and the Liran and Zeldes mass calculation. The systematics of the N=77 isomer decays are discussed, and the intense 01+ and 10+ ground-state beta decays are compared with shell-model predictions for simple spin-flip transitions.
AB - The electron-capture and +-decay branchings (EC/+) and delayed proton decays of A=142 isotopes with 61 Z 66 and A=140 isotopes with 63 Z 65 were investigated with the OASIS facility on-line at the Lawrence Berkeley Laboratory SuperHILAC. Electron capture and positron-decay emission probabilities have been determined for Pm142 and Sm142 decays, and extensive decay schemes have been constructed for Eug142(2.34±0.12 s), Gd142(70.2±0.6 s), Eu140(1.51±0.02 s), and Gd140(15.8±0.4 s). Decay schemes for the new isotopes Tbg142(597±17 ms), Tbm142(303±17 ms), Dy142(2.3±0.3 s), Eum140(125±2 ms), and Tb140(2.4±0.2 s) are also presented. We have assigned rays to these isotopes on the basis of and x coincidences, and from half-life determinations. Electron-capture and +-decay branchings were measured for each decay, and -delayed proton branchings were determined for Dy142, Tb142, and Tb140 decays. QEC values, derived from the measured EC/+ branchings and the level schemes are compared with those from the Wapstra and Audi mass evaluation and the Liran and Zeldes mass calculation. The systematics of the N=77 isomer decays are discussed, and the intense 01+ and 10+ ground-state beta decays are compared with shell-model predictions for simple spin-flip transitions.
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U2 - 10.1103/PhysRevC.43.1066
DO - 10.1103/PhysRevC.43.1066
M3 - Article
AN - SCOPUS:0000273769
SN - 0556-2813
VL - 43
SP - 1066
EP - 1085
JO - Physical Review C
JF - Physical Review C
IS - 3
ER -