Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2011-08-29
Physics
Nuclear Physics
Nuclear Experiment
9 pages, 6 figures, XLIX International Winter Meeting on Nuclear Physics, Bormio 2011, contribution to the proceedings, to be
Scientific paper
The neutron emission in the fragmentation of stable and radioactive Sn and La projectiles of 600 MeV per nucleon has been studied with the Large Neutron Detector LAND coupled to the ALADIN forward spectrometer at SIS. A cluster-recognition algorithm is used to identify individual particles within the hit distributions registered with LAND. The obtained momentum distributions are extrapolated over the full phase space occupied by the neutrons from the projectile-spectator source. The mean multiplicities of spectator neutrons reach values of up to 12 and depend strongly on the isotopic composition of the projectile. An effective source temperature of T approx. 3 - 4 MeV is deduced from the transverse momentum distributions. For the interpretation of the data, calculations with the Statistical Multifragmentation Model for a properly chosen ensemble of excited sources were performed. The possible modification of the liquid-drop parameters of the fragment description in the hot environment is studied, and a significant reduction of the symmetry-term coefficient is found necessary to simultaneously reproduce the neutron multiplicities and the mean neutron-to-proton ratios
ALADIN2000 Collaboration
Botvina A. S.
Brzychczyk Janusz
Buyukcizmeci N.
Mishustin Igor N.
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