Elsevier

Nuclear Physics A

Volume 132, Issue 1, 14 July 1969, Pages 28-48
Nuclear Physics A

Levels in 183Ta from the decay of 183Hf

https://doi.org/10.1016/0375-9474(69)90610-1Get rights and content

Abstract

The γ- and β-radiation associated with the decay of 1.1 h 183Hf have been studied to provide information concerning the energy levels of the daughter nucleide, 73183Ta. The 183Hf source was produced by thermal-neutron irradiation of a sample of isotopically separated 182Hf(T12 = 9 × 106y) made by the double-neutron capture process from 180Hf. Beta-ray spectra and β-γ coincidences were studied with an anthracene detector and an anthracene NaI(Tl) coincidence system. The γ-ray spectrum was studied using a Ge(Li) spectrometer; and γ-γ coincidence measurements were made using NaI(Tl) detectors. The proposed decay scheme, which incorporates 21 of the 49 observed transitions, contains levels in 183Ta (with I, Kπ assignments) at the following energies: 0(72, 72+), 73.16(92, 92), 143.19(92, 72+), 459.06(52, 52+), 572.8(72, 52+), 856.9(52, 52), 1150.8 and 1543.4 keV (52, 52). The levels at 0, 73 and 459 keV are presumed to correspond to the Nilsson orbitals 72+[404], 92[514], and 52+[402]. The ground state of 183Hf has Iπ = 32 and presumably corresponds to the Nilsson orbital 32[512]. The state at 856.9 keV is interpreted as a K-2 gamma-vibrational excitation built on the 73 keV level. The experimental data concerning this state are discussed in terms of its expected microscopic description and good agreement is obtained.

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