FIZIKA B 9 (2000)  3, 97-110

THE gg-COINCIDENCE MEASUREMENTS OF ¹⁶⁶Ho FROM THE (n,g) REACTION

P. PROKOFJEVS^a, L. I. SIMONOVA^a, M. BALODIS^a, J. BERZINS^a,
V. BONDARENKO^a, J. HONZATKO^b, I. TOMANDL^b, S. BONEVA^c,
V. A. KHITROV^c and A. M. SUKHOVOJ^c

^aNuclear Research Center, LV 2169 Salaspils, Latvia

^cJoint Institute of Nuclear Research, 141980 Dubna, Russia

Received 15 November 1999; Accepted 15 May 2000

Levels of ¹⁶⁶Ho were studied using thermal and average resonance neutron capture and with the (d,p) and (d,³He) reactions. We have devoted a large effort to the measurements of the gg-coincidence spectra in the broad energy region 50 - 6243 keV. Based on these data and those of earlier studies, the levels are grouped into 23 rotational bands. Among them are 6 new ones. The results are in good agreement with the semiempirical and quasiparticle-phonon model, where Coriolis and residual interactions are taken into account. Details of model interpretation have been presented in a previously published paper.

PACS numbers: 21.10-k, 23.20 Lv, 27.80+w
UDC 539.172.4

Keywords: ¹⁶⁶Ho levels, (n,g) reaction, thermal neutrons, Ge spectrometers,
gg-coincidence spectra

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