Physics Letters B (Feb 2020)
Multi-quasiparticle sub-nanosecond isomers in 178W
- M. Rudigier,
- P.M. Walker,
- R.L. Canavan,
- Zs. Podolyák,
- P.H. Regan,
- P.-A. Söderström,
- M. Lebois,
- J.N. Wilson,
- N. Jovancevic,
- A. Blazhev,
- J. Benito,
- S. Bottoni,
- M. Brunet,
- N. Cieplicka-Orynczak,
- S. Courtin,
- D.T. Doherty,
- L.M. Fraile,
- K. Hadynska-Klek,
- M. Heine,
- Ł.W. Iskra,
- J. Jolie,
- V. Karayonchev,
- A. Kennington,
- P. Koseoglou,
- G. Lotay,
- G. Lorusso,
- M. Nakhostin,
- C.R. Nita,
- S. Oberstedt,
- L. Qi,
- J.-M. Régis,
- V. Sánchez-Tembleque,
- R. Shearman,
- W. Witt,
- V. Vedia,
- K.O. Zell
Affiliations
- M. Rudigier
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK; Principal corresponding author.
- P.M. Walker
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK; Corresponding author.
- R.L. Canavan
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK; National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK
- Zs. Podolyák
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- P.H. Regan
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK; National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK
- P.-A. Söderström
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstrasse 9, 64289, Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- M. Lebois
- Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France; Université Paris-Saclay, 15 Rue G. Clémenceau, 91406 Orsay Cedex, France
- J.N. Wilson
- Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France; Université Paris-Saclay, 15 Rue G. Clémenceau, 91406 Orsay Cedex, France
- N. Jovancevic
- Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France; Université Paris-Saclay, 15 Rue G. Clémenceau, 91406 Orsay Cedex, France
- A. Blazhev
- Institut für Kernphysik der Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
- J. Benito
- Universidad Complutense, Grupo de Física Nuclear and UPARCOS, CEI Moncloa, E-28040 Madrid, Spain
- S. Bottoni
- Dipartimento di Fisica, Università degli Studi di Milano and INFN sez. Milano, I-20133, Milano, Italy
- M. Brunet
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- N. Cieplicka-Orynczak
- Institute of Nuclear Physics, Polish Academy of Sciences, PL-31-342 Kraków, Poland
- S. Courtin
- IPHC and CNRS, Universite de Strasbourg, F-67037 Strasbourg, France
- D.T. Doherty
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- L.M. Fraile
- Universidad Complutense, Grupo de Física Nuclear and UPARCOS, CEI Moncloa, E-28040 Madrid, Spain
- K. Hadynska-Klek
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- M. Heine
- IPHC and CNRS, Universite de Strasbourg, F-67037 Strasbourg, France
- Ł.W. Iskra
- Dipartimento di Fisica, Università degli Studi di Milano and INFN sez. Milano, I-20133, Milano, Italy; Institute of Nuclear Physics, Polish Academy of Sciences, PL-31-342 Kraków, Poland
- J. Jolie
- Institut für Kernphysik der Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
- V. Karayonchev
- Institut für Kernphysik der Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
- A. Kennington
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- P. Koseoglou
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstrasse 9, 64289, Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- G. Lotay
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- G. Lorusso
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK; National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK
- M. Nakhostin
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- C.R. Nita
- Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), R-077125 Bucharest, Romania
- S. Oberstedt
- European Commission, Joint Research Centre, Directorate G, Retieseweg 111, 2440 Geel, Belgium
- L. Qi
- Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France; Université Paris-Saclay, 15 Rue G. Clémenceau, 91406 Orsay Cedex, France
- J.-M. Régis
- Institut für Kernphysik der Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
- V. Sánchez-Tembleque
- Universidad Complutense, Grupo de Física Nuclear and UPARCOS, CEI Moncloa, E-28040 Madrid, Spain
- R. Shearman
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK; National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK
- W. Witt
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstrasse 9, 64289, Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- V. Vedia
- Universidad Complutense, Grupo de Física Nuclear and UPARCOS, CEI Moncloa, E-28040 Madrid, Spain
- K.O. Zell
- Institut für Kernphysik der Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
- Journal volume & issue
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Vol. 801
Abstract
We report on the first measurement of the half-lives of Kπ=11− and 12+ four-quasiparticle states in the even-even nucleus 178W. The sub-nanosecond half-lives were measured by applying the centroid shift method to data taken with LaBr3(Ce) scintillator detectors of the NuBall array at the ALTO facility in Orsay, France. The half-lives of these states only became experimentally accessible by the combination of several experimental techniques - scintillator fast timing, isomer spectroscopy with a pulsed beam, and the event-by-event calorimetry information provided by the NuBall array. The measured half-lives are 476(44)ps and 275(65)ps for the Iπ=11− and 12+ states, respectively. The decay transitions include weakly hindered E1 and E2 branches directly to the ground-state band, bypassing the two-quasiparticle states. This is the first such observation for an E1 transition. The interpretation of the small hindrance hinges on mixing between the ground-state band and the t-band.
