Abstract
The FRAGM experiment at the ITEP-TWA heavy ion facility has a unique opportunity of measuring the momentum distributions of nuclear fragments. We present the results of 56Fe fragmentation into light ions on 9Be target at 0.23 GeV/nucleon. The momentum spectra of projectile like fragments were measured with a high resolution beam line spectrometer. In contrast to the carbon fragmentation, where the momentum spectra have Gaussian-like shapes, in the emission of the light fragments the shapes have a double-humped structure. This splitting is most pronounced in proton spectra. The possibility of describing this effect by asymmetric fission and multifragmentation is discussed. A comparison is made with the results of the FRS measurements at GSI. The obtained experimental data are in a reasonable agreement with the predictions of several transport codes such as BC, INCL and LAQGSM.
Highlights
During a long-term study of ion-ion interactions, a considerable progress has been made in understanding the physics associated with these interactions; a large amount of experimental data has been accumulated in a wide energy range from the Coulomb barrier to several TeV per nucleon
In statistical models the parameters of this form are related to the Fermi-motion of nucleons in the incident nucleus. These parameters defined in the projectile rest frame are in good agreement with the hypothesis of limiting fragmentation, and they depend neither on the type of the target nucleus nor on the energy of the incident nucleus
The momentum spectra have a splitting structure in the peak maximum
Summary
During a long-term study of ion-ion interactions, a considerable progress has been made in understanding the physics associated with these interactions; a large amount of experimental data has been accumulated in a wide energy range from the Coulomb barrier to several TeV per nucleon. The hodoscope system of the beam line spectrometers could improve the measured momentum up to 0.2% This allowed us to perform a study of the iron fragmentation products in the region inaccessible for FRS-GSI from protons to lithium isotopes and in the area overlapping with it to carbon isotopes. It can significantly expands the range of possible manifestations of this effect and will provide additional information for theoretical analysis, which, hopefully, will provide an opportunity to explain this effect
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