Isospin symmetry in the sd shell: transition strengths in the neutron-deficient sd shell nucleus 33Ar

A. Wendt, J. Taprogge, P. Reiter, P. Golubev, H. Grawe, S. Pietri, P. Boutachkov, A. Algora, F. Ameil, M.A. Bentley, A. Blazhev, D. Bloor, B.S. Nara Singh, M. Bowry, A. Bracco, N. Braun, F. Camera, J. Cederkäll, F. Crespi, A. de la SalleD. DiJulio, P. Doornenbal, K. Geibel, J. Gellanki, J. Gerl, J. Grebosz, G. Guastalla, T. Habermann, M. Hackstein, R. Hoischen, A. Jungclaus, E. Merchán, B. Million, A. Morales, K. Moschner, Zs. Podolyák, N. Pietralla, D. Ralet, M. Reese, D. Rudolph, L. Scruton, B. Siebeck, N. Warr, O. Wieland, H.J. Wollersheim

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5 Citations (Scopus)


Reduced transition strengths of the deexciting transitions from the first two excited states in
33Ar were measured in a relativistic Coulomb excitation experiment at the GSI Helmholtz center. The radioactive ion beam was produced by fragmentation of a primary 36Ar beam on a
9Be target followed by the selection of the reaction product of interest via the GSI Fragment Separator. The 33Ar beam hit a secondary
197Au target with an energy of approximately 145 MeV/nucleon. An array of high-purity germanium cluster detectors and large-volume
BaF2 scintillator detectors were employed for
γ-ray spectroscopy at the secondary target position. The Lund-York-Cologne Calorimeter was used to track the outgoing ions and to identify the nuclear reaction channels. For the two lowest energy excited states of
33Ar the reduced transition strengths have been determined. With these first results the
Tz=−3/2 nucleus 33Ar is now, together with
21Na (Tz=−1/2), the only neutron-deficient odd-
A sd shell nucleus in which experimental transition strengths are available. The experimental values are compared to results of shell-model calculations which describe simultaneously mirror-energy differences and transition-strength values of mirror pairs in the
sd shell in a consistent way.
Original languageEnglish
Article number019904
JournalPhysical Review C
Issue number5
Publication statusPublished - 4 Nov 2014


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