Recoil-gated plunger lifetime measurements in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>188</mn></mrow></msup></mrow><mi mathvariant="normal">Pb</mi></math></span>

A. Dewald; R. Peusquens; B. Saha; P. von Brentano; A. Fitzler; T. Klug; I. Wiedenhöver; Carpenter; A. Heinz; R. V. F. Janssens; F. G. Kondev; C. J. Lister; D. Seweryniak; K. Abu Saleem; R. Krücken; J. R. Cooper; C. J. Barton; K. Zyromski; C. W. Beausang; Z. Wang; P. Petkov; A. M. Oros-Peusquens; U. Garg; S. Zhu

doi:10.1103/PhysRevC.68.034314

Recoil-gated plunger lifetime measurements in $^{188} Pb$

A. Dewald, R. Peusquens, B. Saha, P. von Brentano, A. Fitzler, T. Klug, I. Wiedenhöver, Carpenter, A. Heinz, R. V. F. Janssens, F. G. Kondev, C. J. Lister, D. Seweryniak, K. Abu Saleem, R. Krücken, J. R. Cooper, C. J. Barton, K. Zyromski, C. W. Beausang, Z. Wang, P. Petkov, A. M. Oros-Peusquens, U. Garg, and S. Zhu

Phys. Rev. C 68, 034314 – Published 18 September 2003

Abstract

Electromagnetic transition probabilities were measured using the recoil distance Doppler-shift technique and the $^{40} Ca (^{152} Sm {, 4 n)}^{188} Pb$ reaction at a beam energy of 805 MeV to investigate shape coexistence in $^{188} Pb .$ For the first time, a plunger was combined with Gammasphere and the Argonne Fragment Mass Analyzer. It was possible to measure the lifetimes of two states in the prolate band of $^{188} Pb$ and, thus, provide for the first time evidence for the collectivity of this band. A three-level mixing calculation revealed that the first $2^{+}$ state is predominantly of prolate character.

Received 2 June 2003

DOI:https://doi.org/10.1103/PhysRevC.68.034314

Authors & Affiliations

A. Dewald, R. Peusquens, B. Saha, P. von Brentano, A. Fitzler, and T. Klug

Institut für Kernphysik, Universität zu Köln, Köln, Germany

I. Wiedenhöver^*, Carpenter, A. Heinz, R. V. F. Janssens, F. G. Kondev, C. J. Lister, D. Seweryniak, and K. Abu Saleem

Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA

R. Krücken^†, J. R. Cooper^‡, C. J. Barton^§, K. Zyromski, C. W. Beausang, and Z. Wang

W. A. Wright Nuclear Laboratory, Yale University, New Haven, Connecticut 06520, USA

P. Petkov

Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria

A. M. Oros-Peusquens^∥

Georgia Institute of Technology, School of Physics, Atlanta, Georgia 30332-0430, USA

U. Garg and S. Zhu

University of Notre Dame, Notre Dame, Indiana 46556-5670, USA

^*Present address: Florida State University, Physics Department, Tallahassee, FL 32306-4350.
^†Present address: Physik-Department E12, TU München, 85748 Garching, Germany.
^‡Present address: Lawrence Livermore National Laboratory, Livermore, CA 94550-9234.
^§Present address: CCLRC Daresbury Laboratory, Daresbury Warrington Cheshire WA4 4AD, UK.
^∥Present address: FZ Jülich, D- 52425 Jülich, Germany.

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Vol. 68, Iss. 3 — September 2003

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