Systematic experimental survey on projectile fragmentation and fission induced in collisions of238U at 1A GeV with lead

Enqvist, T.; Benlliure, J.; Farget, F.; Schmidt, Karl‐Heinz; Armbruster, P.; Böckstiegel, C.; Jong, M. de; Bernas, M.; Tassan‐Got, L.; Boudard, A.; Légrain, R.; Volant, C.; Dufour, J.P.

doi:10.1007/bf03035981

Cited by 1 publication

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“…In addition, the measurements of the energy loss and the mass-to-charge ratio lead to the full isotopic identification. A very systematic overview is shown in picture 1 (right) for the collision of 238 U with lead at 1 A GeV [8]: we can clearly recognize the region of electromagnetic-induced fission: this process originates from low-excited projectile-like prefragments and, consequently, produces very neutronrich residues. The area of high-energy fission, generated by more excited prefragments, is less neutron rich.…”

Section: Experimental Investigation Of the Reaction Mechanismmentioning

confidence: 92%

“…The isotopic cross-sections of 238 U fragments, produced in a lead target at 1 A GeV [8], show an increasing deviation from the corridor (represented by the two-stage model calculation [9] in figure 2) for decreasing Z towards higher neutron numbers. As presented in figure 2, the measured fragmentation residues of 238 U even have the tendency to cross the stability line; this is very surprising because, with respect to β stability (equal Fermi levels of protons and neutrons), the evaporation of protons is suppressed by the Coulomb barrier.…”

Section: Study Of the Neutron Excess Of The Fragmentation Residuesmentioning

confidence: 99%

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Determination of the freeze-out temperature by the isospin thermometer

et al. 2003

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The high-resolution spectrometer FRS at GSI, Darmstadt, provides the full isotopic and kinematical identification of fragmentation residues in relativistic heavy-ion collisions. Recent measurements of the isotopic distribution of heavy projectile fragments led to a very surprising new physical finding: the residue production does not lose the memory of the N/Z of the projectile ending up in a universal de-excitation corridor; an ordering of the residues in relation to the neutron excess of the projectile has been observed. These unexpected features can be interpreted as a new manifestation of multifragmentation. We have found that at the last stage of the reaction the temperature of the big clusters subjected to evaporation is limited to a universal value. The thermometer to measure this limiting temperature is the neutron excess of the residues.

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Section: Experimental Investigation Of the Reaction Mechanismmentioning

confidence: 92%

Section: Study Of the Neutron Excess Of The Fragmentation Residuesmentioning

confidence: 99%