27 research outputs found
Experimental study of fragmentation products in the reactions 112Sn + 112Sn and 124Sn + 124Sn at 1 AGeV
Production cross-sections and longitudinal velocity distributions of the
projectile-like residues produced in the reactions 112Sn + 112Sn and 124Sn +
124Sn both at an incident beam energy of 1 AGeV were measured with the
high-resolution magnetic spectrometer, the Fragment Separator (FRS) of GSI. For
both reactions the characteristics of the velocity distributions and nuclide
production cross sections were determined for residues with atomic number Z
10. A comparison of the results of the two reactions is presented.Comment: 14 pages, 12 figure
Measurement of the complete nuclide production and kinetic energies of the system 136Xe + hydrogen at 1 GeV per nucleon
We present an extensive overview of production cross sections and kinetic
energies for the complete set of nuclides formed in the spallation of 136Xe by
protons at the incident energy of 1 GeV per nucleon. The measurement was
performed in inverse kinematics at the FRagment Separator (GSI, Darmstadt).
Slightly below the Businaro-Gallone point, 136Xe is the stable nuclide with the
largest neutron excess. The kinematic data and cross sections collected in this
work for the full nuclide production are a general benchmark for modelling the
spallation process in a neutron-rich nuclear system, where fission is
characterised by predominantly mass-asymmetric splits.Comment: 18 pages, 14 figure
High-precision measurement of total fission cross sections in spallation reactions of 208Pb and 238U
Total cross sections for proton- and deuteron-induced-fission of 208Pb and
238U have been determined in the energy range between 500 MeV and 1 GeV. The
experiment has been performed in inverse kinematics at GSI Darmstadt,
facilitating the counting of the projectiles and the identification of the
reaction products. High precision between 5 and 7 percent has been achieved by
individually counting the beam particles and by registering both fission
fragments in coincidence with high efficiency and full Z resolution. Fission
was clearly distinguished from other reaction channels. The results were found
to deviate by up to 30 percent from Prokofiev's systematics on total fission
cross sections. There is good agreement with an elaborate experiment performed
in direct kinematics.Comment: 18 pages, 12 figure
Absolute prompt-gamma yield measurements for ion beam therapy monitoring
International audiencePrompt-gamma emission detection is a promising technique for hadrontherapy monitoring purposes. In this regard, obtaining prompt-gamma yields that can be used to develop monitoring systems based on this principle is of utmost importance since any camera design must cope with the available signal. Herein, a comprehensive study of the data from ten single-slit experiments is presented, five consisting in the irradiation of either PMMA or water targets with lower and higher energy carbon ions, and another five experiments using PMMA targets and proton beams. Analysis techniques such as background subtraction methods, geometrical normalization, and systematic uncertainty estimation were applied to the data in order to obtain absolute prompt-gamma yields in units of prompt-gamma counts per incident ion, unit of field of view, and unit of solid angle. At the entrance of a PMMA target, where the contribution of secondary nuclear reactions is negligible, prompt-gamma counts per incident ion, per millimetre and per steradian equal to (124 ± 0.7stat ± 30sys) Ă 10â6 for 95 MeV uâ1 carbon ions, (79 ± 2stat ± 23sys) Ă 10â6 for 310 MeV uâ1 carbon ions, and (16 ± 0.07stat ± 1sys) Ă 10â6 for 160 MeV protons were found for prompt gammas with energies higher than 1 MeV. This shows a factor 5 between the yields of two different ions species with the same range in water (160 MeV protons and 310 MeV uâ1 carbon ions). The target composition was also found to influence the prompt-gamma yield since, for 300/310 MeV uâ1 carbon ions, a 42% greater yield ((112 ± 1stat ± 22sys) Ă 10â6 counts ionâ1 mmâ1 srâ1) was obtained with a water target compared to a PMMA one