Bochum 1998 – wissenschaftliches Programm
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HK: Hadronen und Kerne
HK 52: Heavy Ion Reactions VI, Relativistic Energies
HK 52.7: Vortrag
Mittwoch, 18. März 1998, 15:45–16:00, F
Light charged particles accompanying 14N (34 and 53 AMeV) and 40Ar (38 AMeV) induced fission* — •D.V. Kamanin1,2, C.-M. Herbach1, H.-G. Ortlepp1, K.D. Schilling1, V.G. Tichtchenko2, W. Wagner1, and R. Yanez1 — 1Research Center Rossendorf Inc., 01314 Dresden, Germany — 2Joint Institute for Nuclear Research, 141980 Dubna, Russia
The relatively light 14N projectile has been used
on heavy targets of 197Au, 232Th
to select the fission of equilibrated system
after incomplete fusion.
The CsI(Tl)-crystal shell of 4π-fragment spectrometer
FOBOS has been used to measure the light charged particles
(LCP) accompanying fission. For fission fragment (FF) pairs
registrated in the gas-filled detector array, both masses and velocity
vectors have been determined. The further analysis includes the mass
splits and the transferred linear momentum as measure of the
excitation energy.
The decomposition of the LCP spectra into the pre- and post-scission
components allows to determine the excitation energy
remaining in FF and to estimate the scission times. Multiplicities
obtained
for symmetric fission and
for the projectile energy of 34 AMeV agree with the data from
literature.
For the energy of 53 AMeV a large contribution of pre-equilibrium
LCP has been observed up to the very backward angles. The results are
compared with simulations including both pre-equilibrium and
statistical particle emission.
* supported by BMBF under contract 06 DR 671 D