Normal and superdeformed high-spin structures in $^{161}\mathrm{Lu}$

Normal and superdeformed high-spin structures in ${}^{161}{Lu}$

P. Bringel, H. Hübel, A. Al-Khatib, A. Bürger, N. Nenoff, A. Neußer-Neffgen, G. Schönwasser, A. K. Singh, G. B. Hagemann, B. Herskind, D. R. Jensen, G. Sletten, P. Bednarczyk, D. Curien, D. T. Joss, J. Simpson, G. Gangopadhyay, Th. Kröll, G. Lo Bianco, C. M. Petrache, S. Lunardi, W. C. Ma, and N. Singh

Phys. Rev. C 73, 054314 – Published 31 May 2006

Abstract

High-spin states in ${}^{161}{Lu}$ were populated in the ${}^{139}{La}$ ( ${}^{28}{Si}$ , $6 n$ ) reaction and γ-ray coincidences were measured with the EUROBALL spectrometer. On the basis of these data, the previously known level scheme is extended with new band structures and is partly revised. Configuration assignments are made to all bands based on comparison of experimental properties with cranked shell model calculations. A strongly populated band with parity and signature $(π, α) = (+, - 1 / 2)$ is found to be yrast above spin $I ≃ 33$ . This band shows characteristics resembling those of two triaxial superdeformed bands in this nucleus based on the occupation of the shape-driving $i_{13 / 2}$ proton orbital. This structure, unique to ${}^{161}{Lu}$ within the chain of even- $N$ Lu isotopes, is discussed in terms of a quasiparticle configuration in a local triaxial minimum with a larger triaxiality and a smaller quadrupole deformation than calculated for the $i_{13 / 2}$ proton excitation.

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Received 4 January 2006

DOI:https://doi.org/10.1103/PhysRevC.73.054314

Authors & Affiliations

P. Bringel^*, H. Hübel, A. Al-Khatib, A. Bürger, N. Nenoff, A. Neußer-Neffgen, G. Schönwasser, and A. K. Singh^†

Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Nußallee 14-16, D-53115 Bonn, Germany

G. B. Hagemann, B. Herskind, D. R. Jensen, and G. Sletten

Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen, Denmark

P. Bednarczyk^‡ and D. Curien

Institut de Recherche Subatomique, 23 Rue du Loess, F-67037 Strasbourg, France

D. T. Joss^§ and J. Simpson

CCLRC, Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom

G. Gangopadhyay

Department of Physics, University College of Science, 92 A.P.C. Road, Kolkata 700009, India

Th. Kröll^∥

INFN, Laboratori Nazionali di Legnaro, Viale dell’ Università 2, I-35020 Legnaro, Italy

G. Lo Bianco and C. M. Petrache

Dipartimento di Fisica, Università di Camerino and INFN, Sez. Perugia, I-62032 Camerino, Italy

S. Lunardi

Dipartimento di Fisica, Università di Padova and INFN, Via F. Marzolo 8, I-35131 Padova, Italy

W. C. Ma

Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA

N. Singh

Department of Physics, Panjab University, Chandigarh 160014, India

^*Electronic address: bringel@iskp.uni-bonn.de
^†Present address: Department of Physics, IIT Kharagpur, Kharagpur 721302, India.
^‡Present address: GSI, D-64291 Darmstadt, Germany. Permanent address: Niewodniczanski Inst. of Nucl. Phys., Polish Academy of Sciences, Pl-31342 Kracow, Poland.
^§Present address: Oliver Lodge Laboratory, Univ. of Liverpool, Liverpool L69 3BX, UK.
^∥Present address: Physik Department, Technische Univ. München, D-85748 Garching, Germany.

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Vol. 73, Iss. 5 — May 2006

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Physical Review C

covering nuclear physics

Normal and superdeformed high-spin structures in ${}^{161}{Lu}$

Phys. Rev. C 73, 054314 – Published 31 May 2006

Abstract

Authors & Affiliations

Article Text (Subscription Required)

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Physical Review C

covering nuclear physics

Normal and superdeformed high-spin structures in Lu161

Phys. Rev. C 73, 054314 – Published 31 May 2006

Abstract

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Normal and superdeformed high-spin structures in ${}^{161}{Lu}$