Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

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. Wagner21Joint 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

100% | Bildschirmansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 1998 > Bochum