Multifragmentation induced by relativistic α-projectiles

• Published in: Nuclear physics. A Vol. 583; pp. 585 - 588
• Main Authors: Lips, V., Barth, R., Oeschler, H., Avdeyev, S.P., Karnaukhov, V.A., Kuznetsov, W.D., Petrov, L.A., Bochkarev, O.V., Chulkov, L.V., Kuzmin, E.A., Karcz, W., Neubert, W., Norbeck, E., Li, Bao-An, Gross, D.H.E.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 06.02.1995
• ISSN: 0375-9474
• DOI: 10.1016/0375-9474(94)00731-2

Multifragmentation of the system α + 197 Au has been studied at incident energies of 1 and 3.6 GeV/nucleon with the new 4π setup, “FASA”. A very high mean IMF multiplicity of 〈 M〉 IMF =5.1 ± 0.8 is observed at the higher incident energy. Applying the statistical multifragmentation model of Gross, a breakup density ϱ ϱ 0 of about 1 7 is deduced from the relative velocity between two IMFs at large relative angles. The excitation energy increases from 4.5 MeV/nucleon at the lower beam energy to 5.5 MeV/nucleon at the higher beam energy. The time difference between the emission of two IMFs is less than 100 fm/c, justifying to call this process a simultaneous breakup.