Evidence for the Wobbling Mode in Nuclei

S. W. Ødegård; G. B. Hagemann; D. R. Jensen; M. Bergström; B. Herskind; G. Sletten; S. Törmänen; J. N. Wilson; P. O. Tjøm; I. Hamamoto; K. Spohr; H. Hübel; A. Görgen; G. Schönwasser; A. Bracco; S. Leoni; A. Maj; C. M. Petrache; P. Bednarczyk; D. Curien

doi:10.1103/PhysRevLett.86.5866

Evidence for the Wobbling Mode in Nuclei

S. W. Ødegård, G. B. Hagemann, D. R. Jensen, M. Bergström, B. Herskind, G. Sletten, S. Törmänen, J. N. Wilson, P. O. Tjøm, I. Hamamoto, K. Spohr, H. Hübel, A. Görgen, G. Schönwasser, A. Bracco, S. Leoni, A. Maj, C. M. Petrache, P. Bednarczyk, and D. Curien

Phys. Rev. Lett. 86, 5866 – Published 25 June 2001

Abstract

The nucleus $^{163} Lu$ has been populated through the fusion-evaporation reaction $^{139} La (^{29} Si, 5 n)^{163} Lu$ with a beam energy of 152 MeV. The electromagnetic properties of several connecting transitions between two presumably triaxial, strongly deformed (TSD) bands have been studied. Evidence is presented for the assignment of the excited TSD band as a wobbling mode built on the yrast TSD band, based on comparisons to new calculations in which an aligned particle is coupled to a strongly deformed triaxial rotor. The wobbling mode is uniquely related to triaxiality in nuclei.

Received 26 January 2001

DOI:https://doi.org/10.1103/PhysRevLett.86.5866

Authors & Affiliations

S. W. Ødegård^1,2, G. B. Hagemann¹, D. R. Jensen¹, M. Bergström¹, B. Herskind¹, G. Sletten¹, S. Törmänen¹, J. N. Wilson¹, P. O. Tjøm², I. Hamamoto³, K. Spohr⁴, H. Hübel⁵, A. Görgen⁵, G. Schönwasser⁵, A. Bracco⁶, S. Leoni⁶, A. Maj⁷, C. M. Petrache^8,*, P. Bednarczyk^7,9, and D. Curien⁹

¹The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark
²Department of Physics, University of Oslo, PB 1048 Blindern, N-0316 Oslo, Norway
³Department of Mathematical Physics, LTH, University of Lund, Lund, Sweden
⁴Department of Electronic Engineering and Physics, University of Paisley, Scotland
⁵Institut für Strahlen- und Kernphysik, University of Bonn, Nussallee 14-16, D-53115 Bonn, Germany
⁶Dipartemento di Fisica and INFN, Sezione di Milano, Milano, Italy
⁷Niewodniczanski Institute of Nuclear Physics, Krakow, Poland
⁸Dipartemento di Fisica and INFN, Sezione di Padova, Padova, Italy
⁹IReS, 23 rue du Loess, BP 28 F-67037, Strasbourg, France