Lifetime Measurements in Neutron-rich Cu isotopes We present the

Lifetime Measurements in Neutron-rich Cu isotopes
M. Doncel1,2, E. Sahin3, A. Gadea5 G. de Angelis3, B. Quintana2, J.J Valiente-Dobón3, M. Albers6, D.
Bazzacco7, E. Clément9, L. Corradi3, A. Dewald6, G. Duchene10, M. N. Erduran8, E. Farnea7, E. Fioretto3,
C. Fransen6, R. Gernhäuser11, A. Görgen4 , A. Gottardo3, M. Hackstein6, T. Huyuk5, S. Klupp11, W.
Korten4, A. Kusoglu8, S. Lenzi7, J. Ljungvall12, C. Louchart4, S. Lunardi7, R. Menegazzo7, D. Mengoni7,
C. Michelagnoli7, T. Mijatovic16, G. Montagnoli7, D. Montanari3, O. Möller13, D. R. Napoli3, A.
Obertelli4, R. Orlandi14, A. Prieto2, G. Pollarolo15, F. Recchia7, W. Rother6, M-D Salsac4, F. Scarlassara7,
M. Schlarb11, A. Stefanini3, B. Sulignano4, S. Szilner16, C. Ur7
1
Royal Institute of Technology, KTH, Sweden , 2LRI, University of Salamanca, Salamanca, Spain. 3 INFN,
Laboratori Nazionali di Legnaro, Legnaro (Padova), Italy.4 CEA Saclay, IRFU/SPhN, France. 5IFIC, Valencia,
Spain. 6 IKP, University of Köln, Germany. 7 Dipartimento di Fisica dell'Università di Padova and INFN,
Sezione di Padova, Padova, Italy. 8 Department of Physics, Istanbul University, Istanbul, Turkey. 9 GANIL,
CEA/DSM-CNRS/IN2P3, Caen, France. 10 IPHC, IN2P3/CNRS et Iniversité Louis Pasteur, Strasbourg, France..
11
Technische Universität München, Germany. 12 CSNSM Orsay, IN2P3/CNRS, France. 13 Institut für Kernphysik,
TU Darmstadt, Germany. 14 IEM - CSIC, Madrid, Spain. 15 Dipartimento di Fisica Teoria, Universitá di Torino,
Italy. 16 Department of Physics, the University Libre of Bruxelles, Belgium. 17 Ruder Boskovic Institute, Zagreb,
Croatia.
We present the results obtained in the experiment: “Lifetime measurements in
neutron-rich Ni, Cu and Zn isotopes” performed in June 2010 at Laboratori Nazionali di
Legnaro (Italy).
The aim of the experiment has been to measure the lifetime of excited states in
neutron-rich nuclei in the region of 78Ni, in our particular case in the 71Cu isotope,
through the recoil distance Doppler shift method (RDDS), using the AGATA
Demonstrator coupled to the PRISMA spectrometer and to the plunger device provided
by the University of Cologne. This is the first time this setup has been used together in
an experimental measurement.
The states have been populated in a multi-nucleon transfer reaction between a
76
Ge beam of 577 MeV energy and a 238U target of 1.5 mg/cm2 together with a 1.4
mg/cm2 thick Ta backing. The target was mounted together with a Nb degrader foil of
4.2 mg/cm2 thickness in a compact Plunger device. The projectile-like reaction partners
were identified using the PRISMA magnetic spectrometer, which was positioned at 55º
with respect to the beam axes, close to the grazing angle, while γ rays were detected by
the AGATA Demonstrator located at backward angles sensitive to their Doppler shift.
The measured value for the reduced transition probability, obtained through the
lifetime determination of the 7/2- excited sate in 71Cu, is in good agreement with large
shell-model theoretical calculations. The results of the work will be discussed in detail
at the talk.