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First Experiment on Fission Transients in Highly Fissile Spherical Nuclei Produced by Fragmentation of Radioactive Beams

C. Schmitt, P. N. Nadtochy, A. Heinz, B. Jurado, A. Kelić, and K.-H. Schmidt
Phys. Rev. Lett. 99, 042701 – Published 25 July 2007
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Abstract

We report on a novel experimental approach for studying the dissipative spreading of collective motion in a metastable nuclear system, using, for the first time, highly fissile nuclei with spherical shape. This was achieved by fragmentation of 45 radioactive heavy-ion beams at GSI, Darmstadt. The use of inverse kinematics and a dedicated experimental setup allowed for the identification in atomic number of both fission fragments. From the width of their nuclear-charge distributions, a transient time of (3.3±0.7)×10−21  s is deduced for initially spherical nuclei.

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  • Received 19 February 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.042701

©2007 American Physical Society

Authors & Affiliations

C. Schmitt1,*,†, P. N. Nadtochy2, A. Heinz3, B. Jurado4, A. Kelić1, and K.-H. Schmidt1

  • 1Gesellschaft fuer Schwerionenforschung, 64291 Darmstadt, Germany
  • 2Omsk State University, Department of Theoretical Physics, 644077 Omsk, Russia
  • 3Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA
  • 4Université Bordeaux I, CNRS/IN2P3, CENBG, BP 120, 33175 Gradignan, France

  • *Present address: Université Lyon I, CNRS/IN2P3, IPNL, 69622 Villeurbanne Cedex, France.
  • †c.schmitt@ipnl.in2p3.fr

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Vol. 99, Iss. 4 — 27 July 2007

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Images

  • Figure 1
    Figure 1
    Top: Illustrative drawing of the radioactive-beam production (left) and of the subsequent fragmentation-fission reaction (right). Typical time scales (t and t’ refer to the primary and secondary reaction, respectively) are indicated. Bottom: Experimental setup involved along the outlined reaction scenario, consisting of the FRS (left) and the fission setup (right).Reuse & Permissions
  • Figure 2
    Figure 2
    Experimental correlation between the nuclear charges (Z1, Z2) of the fission fragments for a Th222 beam. The color scale is logarithmic.Reuse & Permissions
  • Figure 3
    Figure 3
    Calculated correlation between the initial excitation energy of the system and the Z1+Z2 sum for the Ra215 beam. The color scale is logarithmic.Reuse & Permissions
  • Figure 4
    Figure 4
    Width σZ as a function of Z1+Z2 for a sample of spherical secondary beams as indicated. The data (dots) are compared with calculations using Bohr-Wheeler [22] (dotted lines) and Kramers [23] (dashed lines) fission-decay width as well as the time-dependent approximation (full lines) from 18. In the two latter cases, β is set to 4.5×1021  s−1. Staggering in the calculations is due to statistical fluctuations.Reuse & Permissions
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