Excited states of Hf174 from the decay of Ta174

M. T. Gillin, N. F. Peek

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The Ta174 activity was produced via the Lu175(α,5n)Ta174 reaction with 66-MeV α particles from the Crocker Nuclear Laboratory 76-in. isochronous cyclotron. After removal of the F18, the half-lives were deduced by direct measurements. The half-lives of approximately 200 transitions, ranging in energy from 60 to 3000 keV, were identified using Ge(Li) detectors. Over 95% of these lines were assigned to Hf175, Hf174, or Lu173. The half-life of Ta174 was measured to be 71.5 ± 6.5 min. Ge(Li)-Nal coincidence work has been done. The conversion-electron spectrum was first measured using a 3-mm Si(Li) detector with a cooled field-effect transistor and then using the same type of detector plus a magnet. The energies and γ intensities of the 100 transitions attributed to the decay of Ta174 were measured. 32 conversion coefficients were determined. 16 levels with spins and parities are proposed on the basis of γ intensities, coincidence information, and conversion coefficients. 16 more levels are proposed on the basis of energy sums. Spins and parities for four of these levels are suggested. 60 transitions are placed in the decay scheme. A very strong β feed to the 4+ level of the ground-state rotational band was observed. M1 enhancement in the β vibrational bands and K-forbidden γ transitions are discussed.

Original languageEnglish (US)
Pages (from-to)1334-1344
Number of pages11
JournalPhysical Review C
Volume4
Issue number4
DOIs
StatePublished - 1971

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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