Phys. Rev. C
78,
061302(R)
(2008)
[5 pages]
Single-particle behavior at N=126: Isomeric decays in neutron-rich 204Pt
S. J. Steer et al.
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S. J. Steer1,*, Zs. Podolyák1, S. Pietri1, M. Górska2, P. H. Regan1, D. Rudolph3, E. Werner-Malento2, A. B. Garnsworthy1,4, R. Hoischen3, J. Gerl2, H. J. Wollersheim2, K. H. Maier5,6, H. Grawe2, F. Becker2, P. Bednarczyk2,6, L. Cáceres2,7, P. Doornenbal2,8, H. Geissel2, J. Grębosz2,6, A. Kelic2, I. Kojouharov2, N. Kurz2, F. Montes2, W. Prokopowicz2, T. Saito2, H. Schaffner2, S. Tashenov2, A. Heinz4, M. Pfützner9, T. Kurtukian-Nieto10, G. Benzoni11, A. Jungclaus7, D. L. Balabanski12,13, C. Brandau1, B. A. Brown1,14, A. M. Bruce15, W. N. Catford1, I. J. Cullen1, Zs. Dombrádi16, M. E. Estevez17, W. Gelletly1, G. Ilie8,18, J. Jolie8, G. A. Jones1, M. Kmiecik6, F. G. Kondev19, R. Krücken20, S. Lalkovski15,21, Z. Liu1, A. Maj6, S. Myalski6, S. Schwertel20, T. Shizuma1,22, P. M. Walker1, and O. Wieland11
1University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
2GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
3Department of Physics, Lund University, S-22100 Lund, Sweden
4WNSL, Yale University, 272 Whitney Avenue, New Haven, Connecticut 06520, USA
5University of West of Scotland, Paisley PA1 2BE, United Kingdom
6The Institute of Nuclear Physics, PL-31-342 Kraków, Poland
7Departmento de Fisica Teórica, Universidad Autonoma de Madrid, Madrid, Spain
8IKP, Universität zu Köln, D-50937 Köln, Germany
9IEP, Warsaw University, Hoża 69, PL-00-681, Poland
10Universidad de Santiago de Compostela, Santiago de Campostela, Spain
11INFN sezione di Milano, I-20133 Milano, Italy
12INRNE, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria
13Dipartimento di Fisica, Università di Camerino, I-62032 Camerino, Italy
14NSCL, Michigan State University, East Lansing, Michigan 48824-1321, USA
15School of Engineering, University of Brighton, Brighton BN2 4GJ, United Kingdom
16Institute for Nuclear Research, H-4001 Debrecen, Hungary
17Instituto de Fisica Corpuscular, Valencia, Spain
18National Institute of Physics and Nuclear Engineering, Bucharest, Romania
19Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
20Physik Department E12, Technische Universität München, Garching, Germany
21Faculty of Physics, University of Sofia “St. Kliment Ohridski,” Sofia, Bulgaria
22Japan Atomic Energy Research Institute, Kyoto 619-0215, Japan
Received 31 March 2008; published 18 December 2008
The four proton-hole nucleus 204Pt was populated in the fragmentation of an E/A=1 GeV 208Pb beam. The yrast structure of 204Pt has been observed up to angular momentum I=10ℏ by detecting delayed γ-ray transitions originating from metastable states. These long-lived excited states have been identified to have spin-parities of Iπ=(10+), (7-), and (5-) and half-lives of T1/2=146(14) ns, 55(3)μs, and 5.5(7)μs, respectively. The structure of the magic N=126 204Pt nucleus is discussed and understood in terms of the spherical shell model. The data suggest a revision of the two-body interaction for N=126, Z<82, which determines the evolution of nuclear structure toward the r-process waiting point nuclei.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.78.061302
DOI:
10.1103/PhysRevC.78.061302
PACS:
23.20.Lv, 21.10.Pc, 27.80.+w, 29.30.Kv
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