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This paper gives an overview of the present status of the investigation of the high energetic gamma-component in californium-252(sf). After several experimental attempts and corresponding theoretical work to understand the enhancement of high energy gamma-rays observed in the gamma energy range 3 to 8 MeV for close to symmetric mass splits, the breakthrough came only recently. Statistical model calculations, employing the CASCADE code have been used to interpret the data. A strong sensitivity of the gamma-ray yield has been found on the initial excitation energy of the fragments and on their level density parameters. Only experimentally extracted level densities from neutron evaporation measurements describe the gamma-ray yield well for all mass splits. Hence, the experimentally observed enhancement, earlier thought to be non-statistical, now seems to be of a statistical nature and due to the strong variation of the level density parameter a as a function of fragment mass.

Additional information

Authors: HAMBSCH F-J, JRC Geel (BE);VAN AARLE J, JRC Geel (BE);VOGT R, JRC Geel (BE)
Bibliographic Reference: Paper presented: XIII Meeting on Physics of Nuclear Fission in memory of Prof G N Smirenkin, Obninsk (SU), October 3-6, 1995
Availability: Available from (1) as Paper EN 39379 ORA
Record Number: 199512052 / Last updated on: 1996-01-15
Original language: en
Available languages: en