Multifragmentation study on 30 AMeV 32S 58Ni

In a multidetector experiment on 26 or 30 AMeV32S 58Ni, up to four coincident heavier or intermediate mass fragments were observed. One of these occasionally has the characteristics of a projectile like fragment, up to three may be attributed to the decay of the heavy reaction product. Taking the velocity of the fragments as a measure of the heavy product excitation energy, one finds evaporation, fission and multifragmentation to follow one another with rising excitation. Model simulations of sequential decay with up to two binary fissions and, alternatively, of simultaneous statistical multifragmentation were performed for comparison with experimental distributions of mass, velocity and for events with three slow intermediate mass fragments relative azimuthal angle. Though in the three fragment events indications of simultaneous multifragmentation are present, the sequential binary decay predominates. Evaporated protons and amp; 945; particles detected in coincidence have a mean multiplicity growing with excitation energy, while the temperature governing the spectra has a plateau with a value of about 5.5 Me

Hot nuclei in reactions induced by 475 MeV, 2 GeV 1H and 2 GeV 3He

Inclusive neutron multiplicity distributions have been measured for 475 MeV, 2 GeV proton and 2 GeV He 3 induced reactions on Ag, Au, Bi, U targets. There is general agreement between these multiplicity data and results of intranuclear cascade calculations. The results indicate a broad distribution of excitation energies with 10 of the events exceeding 500 MeV. For a thermalized nucleus this would translate into temperatures exceeding 5 Me

Thermal Excitation Energy Distribution of 475 MeV and 2 GeV Proton and 3He Induced Reactions in Heavy Nuclei

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