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HK: Hadronen und Kerne
HK 52: Heavy Ion Reactions VI, Relativistic Energies
HK 52.8: Vortrag
Mittwoch, 18. März 1998, 16:00–16:15, F
Mass-symmetric tripartition studied in the reactions 40Ar(36AMeV) + 248Cm and 232Th* — •V.G. Tichtchenko1, C.-M. Herbach2, H.-G. Ortlepp2, P. Gippner2, D.V. Kamanin2,1, Yu.E. Penionchkevich1, K.D. Schilling2, and W. Wagner2 — 1Joint Institute for Nuclear Research, 141980 Dubna, Russia — 2Research Center Rossendorf Inc., Institute for Nuclear and Hadron Physics, 01314 Dresden, Germany
The gas-filled detector array of the 4π-fragment spectrometer
FOBOS has been used to measure the decay of hot heavy nuclei,
characterized by a large value of Z2/A, into massive fragments.
By means of incomplete
fusion reactions composite systems of A ≈ 200−250 were produced
at excitation energies of ε* ≈ 1−4 MeV/u.
For each of the fragments, the mass,
the kinetic energy and the emission direction are deduced from the measured
data.
The events from ternary decay are analyzed on the basis of
the mutual emission angles and velocities of the fragment and their
balances (e.g. total linear momentum, total mass,
center-of-mass velocity)
are compared with binary fission.
Besides a dominant group of events with the lightest fragment mass
Amin of approximately half the size of the projectile, which indicates
some memory of the entrance channel, a nearly mass-symmetric component
(Amin>50) occurs with σ ≈ 10 mbarn. The latter will be
discussed in terms of a fission-like decay process of a strongly deformed
system.
* supported by BMBF under contract 06 DR 671 D