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HK: Physik der Hadronen und Kerne

HK 23: Kernphysik/Spektroskopie III - Reaktionen

HK 23.4: Talk

Tuesday, March 20, 2001, 17:45–18:00, D

Formation of excited ⁸Li in neutron-induced fission — •Andreas Oberstedt¹, Stephan Oberstedt^2,3, Dimitri Rochman³, Manfred Mutterer⁴, and ⁵ — ¹Institutionen för Naturvetenskap, Örebro Universitet, SE-70182 Örebro — ²EU-JRC Institute for Reference Materials and Measurements, B-2440 Geel — ³Institut Laue-LAngevin, F-38042 Grenoble — ⁴Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt — ⁵

High resolution spectral measurements of the ternary fission products ^7,8,9Li from thermal neutron-induced fission of ²³⁶U^* have been performed with the recoil mass-separator LOHENGRIN. Information about the formation probability of short-lived, neutron-unstable excited states was expected to be obtained. In order to measure the entire energy distribution of the ternary particles, energy degrader techniques were applied for the first time successfully for the higher particle energies. On the basis of the experimental data the formation probability of the second excited state in ⁸Li (J^π=3⁺, τ=2×10⁻²⁰ s, E^*=2.26 MeV) during fission is estimated to 0.10_−0.10^+0.11.