Evidence for Second-Phonon Nuclear Wobbling
David R. JensenG.B. HagemannI. HamamotoDepartment of Mathematical Physics, LTH, University of Lund, Lund, SwedenS. W. ØdegårdDepartment of Physics, University of Oslo, PB 1048 Blindern, N-0316 Oslo, NorwayB. HerskindG. SlettenJ. N. WilsonK. SpohrDepartment of Electronic Engineering and Physics, University of Paisley, ScotlandH. HübelISKP, University of Bonn, Nussallee 14-16, D-53115 Bonn, GermanyP. BringelISKP, University of Bonn, Nussallee 14-16, D-53115 Bonn, GermanyA. NeußerISKP, University of Bonn, Nussallee 14-16, D-53115 Bonn, GermanyG. SchönwaßerISKP, University of Bonn, Nussallee 14-16, D-53115 Bonn, GermanyA. K. SinghISKP, University of Bonn, Nussallee 14-16, D-53115 Bonn, GermanyW. C.Mississippi State University, Mississippi State, MS 39762H. AmroMississippi State University, Mississippi State, MS 39762A. BraccoDipartemento di Fisica and INFN, Sezione di Milano, Milano, ItalyS. LeoniDipartemento di Fisica and INFN, Sezione di Milano, Milano, ItalyG. BenzoniDipartemento di Fisica and INFN, Sezione di Milano, Milano, ItalyA. MajNiewodniczanski Institute of Nuclear Physics, Krakow, PolandC. M. PetracheDipartemento di Fisica and INFN, Sezione di Padova, Padova, ItalyG. BiancoDipartimento di Matematica e Fisica, Universita di Camerino, Camerino, ItalyP. BednarczykIReS, 23 rue du Loess, BP28 F-67037, Strasbourg, FranceD. CurienIReS, 23 rue du Loess, BP28 F-67037, Strasbourg, France
2002en
ABI
Abstract
The nucleus $^{\mathrm{163}}\mathrm{L}\mathrm{u}$ has been populated through the reaction $^{\mathrm{139}}\mathrm{L}\mathrm{a}(^{\mathrm{29}}\mathrm{S}\mathrm{i},5n)$ with a beam energy of 157 MeV. Three triaxial, strongly deformed (TSD) bands have been observed with very similar rotational properties. The first excited TSD band has earlier been assigned as a one-phonon wobbling excitation built on the lowest-lying (yrast) TSD band. The large $B(E2{)}_{\mathrm{o}\mathrm{u}\mathrm{t}}/B(E2{)}_{\mathrm{i}\mathrm{n}}$ value obtainable for one of four observed transitions between the second and first excited TSD bands is in good agreement with particle-rotor calculations for a two-phonon wobbling excitation.
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