26 research outputs found
Peculiarities of isotopic temperatures obtained from p+A collisions at 1 GeV
Nuclear temperatures obtained from inclusive measurements of double isotopic
yield ratios of fragments produced in 1 GeV p + A collisions amount to about 4
MeV nearly independent from the target mass.Comment: 4 pages, 4 figures, to be submitted to Eur. Phys. J.
Extrapolation of neutron-rich isotope cross-sections from projectile fragmentation
Using the measured fragmentation cross sections produced from the 48Ca and
64Ni beams at 140 MeV per nucleon on 9Be and 181Ta targets, we find that the
cross sections of unmeasured neutron rich nuclei can be extrapolated using a
systematic trend involving the average binding energy. The extrapolated
cross-sections will be very useful in planning experiments with neutron rich
isotopes produced from projectile fragmentation. The proposed method is general
and could be applied to other fragmentation systems including those used in
other radioactive ion beam facilities.Comment: accepted for publication in Europhysics Letter
Light Nuclides Produced in the Proton-Induced Spallation of 238U at 1 GeV
The production of light and intermediate-mass nuclides formed in the reaction
1H+238U at 1 GeV was measured at the Fragment Separator (FRS) at GSI,
Darmstadt. The experiment was performed in inverse kinematics, shooting a 1 A
GeV 238U beam on a thin liquid-hydrogen target. 254 isotopes of all elements in
the range from Z=7 to Z=37 were unambiguously identified, and the velocity
distributions of the produced nuclides were determined with high precision. The
results show that the nuclides are produced in a very asymmetric binary decay
of heavy nuclei originating from the spallation of uranium. All the features of
the produced nuclides merge with the characteristics of the fission products as
their mass increases.Comment: 40 pages, 16 figures, 3 table
Isotope ratios and isoscaling of spallation products in p(1GeV) + A reactions
An analysis of experimental yields concerning isotopically resolved spallation products from 1GeV-proton nucleus interactions with targets from Fe to Cs is presented. It was found that the yield ratios of isotopes classified by the difference of the neutron numbers are compatible with relations derived in the grand-canonical approach. The independence of isotope temperatures from the target mass was demonstrated for spallation products. The spallation residues exhibit isoscaling behaviour. The high sensitivity of the isoscaling parameters to the nucleonic composition (N/Z) of the disassembling nuclei is analysed. A unified isoscaling for a common description of similar reactions is discussed