Göttingen 1997 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 14: Kernspektroskopie, schwere Kerne II

HK 14.3: Vortrag

Montag, 24. März 1997, 18:00–18:15, HS F

High-energy fission in relativistic heavy-ion reactions — •W. Schwab¹, P. Armbruster¹, M. Bernas², S. Czajkowski², Ph. Dessagne³, C. Donzaud², H. Geissel¹, A. Heinz¹, C. Kozhuharov¹, Ch. Miehe³, G. Münzenberg¹, M. Pfützner⁴, K.-H. Schmidt¹, C. Stephan², K. Sümmerer¹, L. Tassan-got², and B. Voss¹ — ¹GSI, Darmstadt — ²IPN Orsay, IN2P3, France — ³CRN Strasbourg, IN2P3, France — ⁴University Warsaw, Poland

High-energy fission products from the heavy-ion reaction Pb(²³⁸U,x) at 750 AMeV were selected with the FRS. They were identified in charge and mass and their velocity was measured [1]. The fragments mass and velocity spectra allowed to clearly distinguish between the fragments produced in a fission after a small excitation (neutron rich) [2] from those close to stability which follow a high-energy nuclear collision. The symetric elemental yield distribution is centered around Z=43.5 showing that a mean number of 5 protons have been abraded before fission. In spite of the high excitation energy involved the yield distribution shows a significant neutron odd-even effect as well as a pronounced enhancement for the neutron number 60.

[1] P. Armbruster et al., Z. Phys. A 355, 191 (1996)

[2] C. Donzaud et al., Z. Phys. A, to be published