Speaker
Dr
Riccardo Orlandi
(IEM - CSIC Madrid, Spain)
Description
Neutron-rich nuclei with magic numbers of neutrons and protons are reference points to map and understand the reorganization of the shell structure away from the line of beta stability. Experiment IS491 aimed at the study of single-particle properties of 79Zn, which lies only 2 protons above and 1 neutron below the Z=28 and N=50 shell closures of 78Ni. The sizes of these shell gaps, from which depends to what extent 78Ni can be considered doubly-magic, are still disputed. Shell-model calculations which take into account the effect of the tensor force predict a weakening of the N=50 shell gap near 78Ni. Recent experimental evidence [1,2] suggests instead a persistence of the gap, and in fact even an increase by 700keV in going from 81Ge to 79Zn. In this experiment, low-lying states in 79Zn were populated via the 78Zn(d,p)79Zn single-neutron transfer reaction, in inverse kinematics. Transfer reactions are the ideal tool to determine effective single particle energy, and thus determine the extent of the shell gap. In this experiment, charged particles were detected using the T-REX silicon chamber coupled to the MINIBALL detector array. Preliminary results will be presented. [1] J. Van de Walle et al., Phys. Rev. Lett. 99 (2007) 142501. [2] Hakala et al., Phys. Rev. Lett. 101 (2008) 052502. *** This work was supported by the European Union Seventh Framework Programm through ENSAR, contract no. 262010.
Authors
Dr
Giacomo de Angelis
(LNL - INFN Legnaro, Italy)
Dr
Riccardo Orlandi
(IEM - CSIC Madrid, Spain)
Prof.
Robert Chapman
(University of the West of Scotland, Paisley, UK)
Co-authors
Mr
Andrea Gottardo
(LNL - INFN Legnaro, Italy)
Dr
Andrea Jungclaus
(IEM - CSIC Madrid, Spain)
Prof.
Andrei Andreyev
(University of the West of Scotland, Paisley, UK)
Dr
Daniele Mengoni
(University of the West of Scotland, Paisley, UK)
Dr
Dennis Muecher
(Techinschen Universitaet Muenchen Germany)
Dr
Eda Sahin
(LNL - INFN Legnaro, Italy)
Dr
Francesco Recchia
(Universita' di Padova, Padova, Italy and INFN Sezione di Padova)
Mr
Jacob Johansen
(Aarhus Universtiy, Aarhus, Denmark)
Mr
Jan Diriken
(IKS Katholieke Universiteit, Leuven, Belgium)
Dr
Janne Pakarinen
(CERN, Geneva, Switzerland)
Dr
Javier Valiente-Dobón
(LNL - INFN Legnaro, Italy)
Dr
John F. Smith
(University of the West of Scotland, Paisley, UK)
Mr
Joseph Lane
(University of the West of Scotland, Paisley, UK)
Dr
Jytte Elseviers
(IKS Katholieke Universiteit, Leuven, Belgium)
Dr
Katrhin Wimmer
(Techinschen Universitaet Muenchen Germany)
Dr
Kieran Flanagan
(University of Manchester, Manchester, UK)
Mr
Luigi Capponi
(University of the West of Scotland, Paisley, UK)
Prof.
Mark Huyse
(IKS Katholieke Universiteit, Leuven, Belgium)
Mr
Mirko von Schmid
(Techinschen Universitaet Darmstadt Germany)
Dr
Nigel Warr
(Universitaet zu Koeln, Koeln, Germany)
Ms
Nowak Katharina
(Techinschen Universitaet Muenchen Germany)
Prof.
Peter Reiter
(Universitaet zu Koeln, Koeln, Germany)
Prof.
Piet Van Duppen
(IKS Katholieke Universiteit, Leuven, Belgium)
Prof.
Reiner Kruecken
(Techinschen Universitaet Muenchen Germany)
Dr
Roman Gernhaeuser
(Techinschen Universitaet Muenchen Germany)
Dr
Steven Pain
(Oak Ridge National Laboratory, Oak Ridge, USA)
Dr
Thomas Cocolios
(CERN, Geneva, Switzerland)
Dr
Thomas Roger
(IKS Katholieke Universiteit, Leuven, Belgium)
Dr
Thorsten Kroell
(Techinschen Universitaet Darmstadt Germany)
Ms
Valentina Liberati
(University of the West of Scotland, Paisley, UK)
Dr
Vinzenz Bildstein
(Techinschen Universitaet Muenchen Germany)
