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Introduction to BRAG: The Baryon Resonance Analysis Group

Authors:	DM Manley

Institution:	(1) Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, E-28006 Madrid, Spain;(2) Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain;(3) Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany;(4) Dipartimento di Fisica dell Universitá and INFN, Sezione di Padova, I-35131 Padova, Italy;(5) Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy

Abstract:	High-spin states in ^160,161,162Ho have been populated in the reactions ^158,160Gd(⁷Li, xn) at 56 MeV. In all three isotopes the known rotational bands have been extended to significantly higher spin. In ¹⁶⁰ Ho, the band crossing in the $\pi$ 7/2^-523] $\otimes$ $\nu$ 11/2^-505] band has been observed for the first time. The sequences built on the proton 7/2^-523], 7/2⁺404], 1/2⁺411] and 1/2^-541] states in ¹⁶¹Ho have been extended up to spin 51/2^-, 35/2⁺, 51/2⁺ and 41/2^-, respectively, leading to the first observation of upbends in all four cases. In addition, a new band most probably belonging to this nucleus has been identified. In the most neutron-rich isotope ¹⁶²Ho, the only known rotational band, which is built on the $\pi$ 7/2^-523] $\otimes$ $\nu$ 5/2⁺642] configuration, has been extended up to the 28^- state. The properties of all observed bands are discussed and compared to the neighbouring isotopes.Received: 4 November 2003, Published online: 23 July 2004PACS: 23.20.Lv $\gamma$ transitions and level energies - 27.70. + q $150 \leq A \leq 189$ - 21.10.Re Collective levels

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