Springer LINK: The European Physical Journal A - Abstract Volume 3 Issue 1 (1998) pp 17-20

The European Physical Journal A

ISSN: 1434-6001 (printed version)
ISSN: 1434-601X (electronic version)

Table of Contents

Abstract Volume 3 Issue 1 (1998) pp 17-20

nuclear structure: First observation of excited states in ¹⁸⁴Pb: spectroscopy beyond the neutron mid-shell

J.F.C. Cocks (1) (a), M. Muikku (1), W. Korten (2), R. Wadsworth (3), S. Chmel (4), J. Domscheit (4), P.T. Greenlees (5), K. Helariutta (1), I. Hibbert (3) (b), M. Houry (2), D. Jenkins (3), P. Jones (1), R. Julin (1), S. Juutinen (1), H. Kankaanpää (1), H. Kettunen (1), P. Kuusiniemi (1), M. Leino (1), Y. Le Coz (2), R. Lucas (2), E. Mergel (4), R.D. Page (5), A. Savelius (1), W. Trzaska (1)

(1) Accelerator Laboratory, Department of Physics, University of Jyväskylä, 40351 Jyväskylä, Finland
(2) DAPNIA/SPhN CEA-Saclay, France
(3) Department of Physics, University of York, Heslington, York YO1 5DD, United Kingdom
(4) Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany
(5) Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom

Received: 19 May 1998 / Revised version: 1 July 1998

Abstract: Excited states have been identified for the first time in ¹⁸⁴Pb, the first even-even Pb isotope beyond the 82 < N < 126 mid-shell, using the recoil-decay tagging (RDT) technique. A collective band built on the first-excited 2⁺ state has been observed. This resembles those seen in ^186,188Pb and the Hg isotones, and can thus be associated with a prolate-deformed shape. Variable moment of inertia (VMI) fits of the prolate 0⁺ level energies in ^184,186,188Pb indicate that the minimum appears at N = 103, the same neutron number at which the corresponding minimum in Hg isotopes is observed.

PACS: 21.60.Ev Collective models - 23.20.-g Electromagnetic transitions - 25.70.gh Compound nucleus - 23.60.+e <alpha> decay

(a) Correspondence to: James.Cocks@phys.jyu.fi
(b) Present address: Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom

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The European Physical Journal A

nuclear structure: First observation of excited states in 184Pb: spectroscopy beyond the neutron mid-shell

nuclear structure: First observation of excited states in ¹⁸⁴Pb: spectroscopy beyond the neutron mid-shell