Delayed crossing in the 1/2-[541] band of 173 Lu

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

doi:10.1140/epja/i2003-10068-4

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2024 Impact factor 2.8

Hadrons and Nuclei

Eur. Phys. J. A (2003) 18: 577-581
https://doi.org/10.1140/epja/i2003-10068-4

Short Note

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

Ts Venkova¹^,2, R. M. Lieder¹^*, W. Gast¹, D. Bazzacco³, G. de Angelis⁴, E. Podsvirova¹, H. M. Jäger¹, L. Mihailescu¹, R. Menegazzo³, S. Lunardi³, C. Rossi Alvarez³, C. Ur³, T. Martinez³, M. Axiotis³, D. Napoli⁴, W. Urban⁵ and T. Rzaca-Urban⁵

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 dell’Universitá, 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

^* e-mail: r.lieder@fz-juelich.de

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.