Nuclear structure of 166Ho studied in neutron-capture, (d,p), and (d,3He) reactions

P. Prokofjevs, L. I. Simonova, M. Balodis, J. Bērziņš, V. Bondarenko, H. F. Wirth, T. von Egidy, C. Doll, J. Ott, W. Schauer, R. W. Hoff, R. F. Casten, R. L. Gill, J. Honzátko, I. Tomandl, S. Boneva, V. A. Khitrov, A. M. Sukhovoj, D. G. Burke, J. Kvasil, and A. Macková
Phys. Rev. C 61, 044305 – Published 1 March 2000
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Abstract

The nucleus 166Ho was studied with thermal and average resonance neutron capture and with (d,p) and (d,3He) reactions. We have devoted a large effort to the measurements of γγ-coincidence spectra in the broad energy interval 50–6243 keV. From these data and those of previous studies, the level scheme has been developed containing levels grouped into 23 rotational bands below 1 MeV. Of these, six bands are new and several others, known previously, have been modified and expanded based upon our experimental data. In all, 32 new levels have been identified. Of particular note has been the identification of two rotational bands whose underlying structure consists of γ-vibrational states built upon the two lowest energy quasiparticle states in 166Ho. Two new Gallagher-Moszkowski matrix elements were determined: EGM(p7/2[523]±n5/2[523])=108.5 keV and EGM{(p7/2[523]±n7/2+[633])Q22}=+138.2 keV. The resultant level scheme is in good agreement with semiempirical and quasiparticle phonon models where residual interactions have been taken into account. Suggestions are given for further experimentation on 166Ho level structure using existing technology.

  • Received 12 August 1999

DOI:https://doi.org/10.1103/PhysRevC.61.044305

©2000 American Physical Society

Authors & Affiliations

P. Prokofjevs, L. I. Simonova, M. Balodis, J. Bērziņš, and V. Bondarenko

  • Nuclear Research Center, LV 2169 Salaspils, Latvia

H. F. Wirth, T. von Egidy, C. Doll, J. Ott, and W. Schauer

  • Technical University of Munich, D-85748 Garching, Germany

R. W. Hoff

  • Lawrence Livermore National Laboratory, Livermore, California 94550

R. F. Casten

  • Yale University, New Haven, Connecticut 06520
  • Brookhaven National Laboratory, Upton, New York 11973

R. L. Gill

  • Brookhaven National Laboratory, Upton, New York 11973

J. Honzátko and I. Tomandl

  • Nuclear Physics Institute, 25068 Řež, Czech Republic

S. Boneva, V. A. Khitrov, and A. M. Sukhovoj

  • Joint Institute of Nuclear Research, Dubna, Russia

D. G. Burke

  • Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1

J. Kvasil and A. Macková

  • Department of Nuclear Physics, Charles University, V Holešovičkách 2, CS-18000 Praha 8, Czech Republic

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Vol. 61, Iss. 4 — April 2000

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