✦ LIBER ✦

Signatures of fission dynamics in highly excited nuclei produced in 197Au(800 A MeV) on proton collisions

✍ Scribed by J. Benlliure; P. Armbruster; M. Bernas; A. Boudard; T. Enqvist; R. Legrain; S. Leray; F. Rejmund; K.-H. Schmidt; C. Stéphan; L. Tassan-Got; C. Volant

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 435 KB
Volume: 700
Category: Article
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(01)01331-8

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✦ Synopsis

197 Au(800 A MeV)-on-proton collisions are used to investigate the fission dynamics at high excitation energy. The kinematic properties together with the isotopic identification of the fission fragments allow to determine the mass, charge and excitation energy of the fissioning nucleus at saddle. The comparison of these observables and the measured total fission cross section with model calculations evidences a clear hindrance of fission at high excitation energy that can be explained in terms of nuclear dissipation. Assuming a statistical evaporation for other de-excitation channels than fission, an estimated value of the transient time of fission of (3 ± 1) × 10 -21 s is obtained.

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Isotopic production cross sections of fission residues in 197Au-on-proton collisions at 800 A MeV

✍ J. Benlliure; P. Armbruster; M. Bernas; A. Boudard; J.P. Dufour; T. Enqvist; R. 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 442 KB

Interactions of 197 Au projectiles at 800 A MeV with protons leading to fission are investigated. We measured the production cross sections and velocities of all fission residues which are fully identified in atomic and mass number by using the in-flight separator FRS at GSI. The new data are compar