Elsevier

Nuclear Physics A

Volume 248, Issue 2, 25 August 1975, Pages 317-341
Nuclear Physics A

Excitation of high-spin states in 190, 191, 192, 193, 194hg through (α, xn) reactions

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Abstract

High-spin states in 190, 191, 192, 193, 194Hg have been populated with (α, xn) reactions and studied using in-beam γ-ray spectroscopy methods. Several new features have been observed in these nuclei. In the ground state bands of190, 192, 194Hg, in addition to the low-spin states up to 8+, a sequence of high-spin states on top of the 10+ isomer (up to 18+ in 192, 194Hg) was observed. The energy spacings of the new level sequences in 190,192,194Hg resemble very closely those observed for the low-lying members of the ground state bands up to 6+. The 10+ state has probably a (πh112−2) two-proton-hole configuration and the level sequence above the 10+ isomer has possibly a structure similar to the low-lying states of the ground state band. In 192, 194Hg the even-spin members of the negative-parity bands with spins and parities 8(−), 10(−), 12(−) …, 18(−) were established. These states are shifted upwards in energy with respect to the odd-spin members 5, 7, 9…, in accordance with recent theoretical calculations. In 191,193Hg a level structure has been observed which compares remarkably well with the band structure of the neighbouring even nuclei. This can be interpreted in the framework of the rotation-alignment model by Coriolis-decoupling of the extra i 132 neutron from the core.

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On leave of absence at: Cyclotron Institute, Texas A & M University, College Station, Texas 77843, USA.

††

Present address: Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex, France.

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