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Excited states in 163,164Ho populated through incomplete-fusion reactions

Authors:	D Hojman M A Cardona D Bazzacco N Blasi J Davidson M Davidson M E Debray A J Kreiner S M Lenzi G Lo Bianco D R Napoli C Rossi Alvarez

Institution:	(1) Departamento de Física, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina;(2) CONICET, Buenos Aires, Argentina;(3) Escuela de Ciencia y Tecnología, Universidad de San Martín, San Martín, Argentina;(4) Dipartimento di Fisica, Sezione di Padova, Padova, Italy;(5) Dipartimento di Fisica and INFN, Sezione di Milano, Milano, Italy;(6) Dipartimento di Fisica, Universitá di Camerino, Camerino (Perugia), Italy;(7) Laboratori Nazionali di Legnaro, INFN, Legnaro (Padova), Italy

Abstract:	High-spin states in ^163,164Ho were investigated by means of in-beam $\gamma$ -ray spectroscopy techniques using the multidetector array GASP. Excited states in ^163,164Ho were populated predominantly through the incomplete-fusion mechanism in the ¹⁶⁰Gd (¹¹B $,\alpha xn)$ reaction at a beam energy of 61 MeV. Known rotational bands in ¹⁶³ Ho have been extended to higher spins and a three-quasiparticle band has been observed in this nucleus. Rotational bands have been identified in ¹⁶⁴Ho and their configurations have been discussed. Empirical Gallagher-Moszkowski (GM) splitting energies were extracted from the $\pi 7/2^-523]\otimes\nu 5/2^-523]$ and $\pi 7/2^-523]\otimes\nu 5/2^ + 642]$ GM doublets. Alignments, band crossing frequencies, and electromagnetic properties have been analyzed in the framework of the cranking model.Received: 13 February 2004, Revised: 18 March 2004, Published online: 14 September 2004PACS: 21.10.Re Collective levels - 21.60.Ev Collective models - 23.20.Lv $\gamma$ transitions and level energies - 27.70. + q $150\leq A\leq 189$

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