Level Structure and Transition Probabilities in 165Tm and 167Tm

L-G Svensson; H Solhed; N-G Jonsson; S M Darwish; J Lindskog

doi:10.1088/0031-8949/13/4/001

Physica Scripta

Level Structure and Transition Probabilities in ¹⁶⁵Tm and ¹⁶⁷Tm

L-G Svensson¹, H Solhed¹, N-G Jonsson¹, S M Darwish^1,2 and J Lindskog¹

Published under licence by IOP Publishing Ltd
Physica Scripta, Volume 13, Number 4 Citation L-G Svensson et al 1976 Phys. Scr. 13 193 DOI 10.1088/0031-8949/13/4/001

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Author affiliations

¹ Institute of Physics, University of Uppsala, Uppsala, Sweden

² Physics Dept., Faculty of Science, Cairo University, Giza, Egypt

Dates

Received 21 November 1975

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Abstract

Transitions in ¹⁶⁵Tm and ¹⁶⁷Tm have been studied by means of the (p,nγ) and (p,2nγ) reactions. Singles gamma-ray spectra, gamma-gamma coincidences and conversion electron spectra have been recorded. The level schemes of both isotopes have partly been verified and new members of the 1/2^-[541] band have been found in ¹⁶⁷Tm. The halflives of three levels in the ground state bands have been measured using an electron-electron coincidence spectrometer: T_1/2 = 322 ± 20 ps for the I = 7/2 level in ¹⁶⁵Tm, T_1/2 = 343 ± 15 ps for the I = 7/2 level in ¹⁶⁷Tm and T_1/2 = 66 ± 7 ps for the I = 5/2 level in ¹⁶⁷Tm. The electric and magnetic moments have been compared for the odd thulium isotopes. It was also shown that the quadrupole deformation epsilon ₂ is constant and that the systematics of the single particle states in these isotopes only may be explained by variations of the hexadecapole deformation, epsilon ₄ of the nuclear shape.

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