https://doi.org/10.1140/epja/i2009-10794-5
Regular Article - Experimental Physics
Structure of neutron-rich nuclei around the N = 126 closed shell; the yrast structure of 205Au126 up to spin-parity
= (19/2+)
1
Department of Physics, University of Surrey, GU2 7XH, Guildford, UK
2
GSI, Planckstrasse 1, D-64291, Darmstadt, Germany
3
Department of Physics, Lund University, S-22100, Lund, Sweden
4
WNSL, Yale University, 272 Whitney Avenue, 06520, New Haven, CT, USA
5
The Institute of Nuclear Physics, PL-31-342, Kraków, Poland
6
Department of Physics, University of the West of Scotland, PA1 2BE, Paisley, Scotland
7
Departmento de Fisica Teórica, Universidad Autonoma de Madrid, Madrid, Spain
8
IKP, Universität zu Köln, D-50937, Köln, Germany
9
Universidad de Santiago de Compostela, Santiago de Campostela, Spain
10
INFN, Università degli Studi di Milano, I-20133, Milano, Italy
11
IEP, Warsaw University, Hoża 69, PL-00-681, Warsaw, Poland
12
INRNE, Bulgarian Academy of Sciences, BG-1784, Sofia, Bulgaria
13
NSCL, Michigan State University, 48824-1321, East Lansing, MI, USA
14
School of Environment and Technology, University of Brighton, BN2 4GJ, Brighton, UK
15
Institute for Nuclear Research, H-4001, Debrecen, Hungary
16
Instituto de Fisica Corpuscular, Valencia, Spain
17
Nuclear Engineering Division, Argonne National Laboratory, 60439, Argonne, IL, USA
18
Physik Department E12, Technische Universität München, Garching, Germany
19
Japan Atomic Energy Agency, 619-0215, Kyoto, Japan
* e-mail: Z.Podolyak@surrey.ac.uk
Received:
31
December
2008
Revised:
1
April
2009
Accepted:
9
April
2009
Published online:
17
May
2009
Heavy neutron-rich nuclei have been populated through the relativistic fragmentation of a beam at
GeV on a
thick Be target. The synthesised nuclei were selected and identified in-flight using the fragment separator at GSI. Approximately 300 ns after production, the selected nuclei were implanted in an
mm thick perspex stopper, positioned at the centre of the RISING
-ray detector spectrometer array. A previously unreported isomer with a half-life
ns has been observed in the N = 126 closed-shell nucleus
. Through
-ray singles and
-
coincidence analysis a level scheme was established. The comparison with a shell model calculation tentatively identifies the spin-parity of the excited states, including the isomer itself, which is found to be
.
© SIF, Springer-Verlag Berlin Heidelberg, 2009