Delayed crossing in the \pi h_{9/2} 1/2-[541] band of 173 Lu期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Delayed crossing in the \pi h_{9/2} 1/2-[541] band of 173 Lu

Authors:	Ts Venkova R M Lieder W Gast D Bazzacco G de Angelis E Podsvirova H M Jäger L Mihailescu R Menegazzo S Lunardi C Rossi Alvarez C Ur T Martinez M Axiotis D Napoli W Urban T Rzaca-Urban

Institution:	(1) Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany;(2) Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria;(3) Istituto Nazionale di Fisica Nucleare, Dipartimento di Fisica dellUniversitá, Sezione di Padova, I-35131 Padova, Italy;(4) Laboratori Nazionali di Legnaro, Istituto Nazionale di Fisica Nucleare, I-35020 Legnaro, Italy;(5) Institute of Experimental Physics, University of Warsaw, PL-00-681 Warszawa, Poland

Abstract:	High-spin states in the odd-proton nucleus ¹⁷³Lu have been populated in a ¹⁷⁰Er(⁷Li,4n) reaction and the emitted $\gamma$ -radiation was detected with the GASP array. The favoured and unfavoured sequences of the $\pi 1/2^- 541]$ band have been considerably extended. The favoured sequence does not show any indication of a band crossing up to a rotational frequency of $\approx$ 0.45 MeV. This is the largest crossing frequency ever observed for 1/2^- 541] bands of odd-proton nuclei with $67 \leq Z \leq 77$ and $90 \leq N \leq 106$ . Previous Cranked Shell Model (CSM) calculations underestimate the crossing frequency by 100 keV.Received: 19 May 2003, Published online: 11 November 2003PACS: 21.10.-k Properties of nuclei; nuclear energy levels - 21.10.Re Collective levels - 23.20.Lv $\gamma$ transitions and level energies - 27.70. + q $150 \leq A \leq 189$

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