Decay studies of neutron deficient nuclei near the Z=64 subshell

Dy142, Tb140,142, Gd140,142, Eu140,142, Sm142, and Pm142

R. B. Firestone, J. Gilat, J. M. Nitschke, Phillip Wilmarth, K. S. Vierinen

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)1066-1085
Number of pages20
JournalPhysical Review C
Volume43
Issue number3
DOIs
StatePublished - 1991
Externally publishedYes

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neutrons
nuclei
decay
isotopes
electron capture
protons
half life
positrons
rays
isomers
ground state
evaluation
predictions

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

Decay studies of neutron deficient nuclei near the Z=64 subshell : Dy142, Tb140,142, Gd140,142, Eu140,142, Sm142, and Pm142. / Firestone, R. B.; Gilat, J.; Nitschke, J. M.; Wilmarth, Phillip; Vierinen, K. S.

In: Physical Review C, Vol. 43, No. 3, 1991, p. 1066-1085.

Research output: Contribution to journalArticle

Firestone, R. B. ; Gilat, J. ; Nitschke, J. M. ; Wilmarth, Phillip ; Vierinen, K. S. / Decay studies of neutron deficient nuclei near the Z=64 subshell : Dy142, Tb140,142, Gd140,142, Eu140,142, Sm142, and Pm142. In: Physical Review C. 1991 ; Vol. 43, No. 3. pp. 1066-1085.
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abstract = "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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