Publications (4)1.21 Total impact
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Article: Total charge-changing and partial cross-section measurements in the reactions of∼ 110–250 MeV/nucleon^{12} C in carbon, paraffin, and water
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ABSTRACT: Total charge-changing cross sections and cross sections for the production of B and Be fragments were directly measured for reactions induced by ∼110–250 MeV/nucleon 12C ions in C, CH2, and H2O targets. Etched track detector (CR-3) was used, together with an automatic track measuring system and a track matching algorithm, to count and to identify the primary and secondary particles. A comparison of the present data and of previously measured cross sections with model predictions is carried out. For the total charge-changing cross section, a model developed at NASA gives the best agreement with the present results (about 3% on the average). However, for the production of fragments, the results of models deviate on average for all systems studied by 9–58 % from the data presented in this work for Z=5 and by 5–47 % for Z=4. The model known as NUCFRG2 is the most reliable in giving the closest values for fragmentation cross sections, 9 and 5% for B and Be fragments, respectively, for the systems studied in this work.Phys. Rev. C. 07/2002; 66(1). -
Article: Fragmentation of 200 and 244 MeV/u carbon beams in thick tissue-like absorbers.
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ABSTRACT: Stacks consisting of thin CR-39 sheets sandwiched between thick lucite and water absorbers were perpendicularly bombarded by 12C ions at 200 and 244 MeV/u. Track radius distributions representing the charge composition of the fragmented beams were automatically measured by a particle track analysis system. After analysis of the nuclear charge distributions, the total charge removal cross-sections and elemental production cross-sections of fragments with atomic numbers from 5 to 3, were obtained down to the lower energies (approximately 50 and 100 MeV/u, respectively). It has been found that the measured total charge removal cross-section agrees with theoretical predictions within approximately 10% and very well with previous experiments in corresponding energy regions. Two model calculations for production of B fragment are in good agreement with our measured data while a third model overestimates it by approximately 12%. Theoretical cross-sections for Be and Li fragments differ strongly among the different models and from measured values.Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms 02/1999; 159(4):233-40. · 1.21 Impact Factor -
Article: Dosimetry of 40 and 70 MeV/n 16O beams
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ABSTRACT: Using CR-39 plastic track detectors the range values of 16O ions at two different energies (initially in the beam line, 39.97 MeV/n and 69.98 MeV/n) were measured after escaping the beam pipe and found to be (3050 ± 40) μm and (8210 ± 90) μm, respectively. The longitudinal and projected angular spread of oxygen ions of an initial energy of 69.98 MeV/n in the region of the Bragg peak was derived from the measured geometrical parameters of tracks. Based on a calibration curve (etch rate ratio vs total linear energy transfer in CR-39) and the measured track length distribution at the range end of oxygen ions, the complete depth dose profile of a 67.7 MeV/n 16O beam in CR-39 (plateau, extended Bragg peak and residual ionization caused by projectile like fragments) was obtained.Radiation Measurements. -
Article: Measurement of the range of 77.1 and 95 MeV/n 20Ne ions
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ABSTRACT: The ranges and their dispersion for 77.1 and 95 MeV/n 20Ne ions in CR-39 track detector were measured and compared with those calculated by the TRIM-90.05 computer code.Radiation Measurements. 25:107-110.
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Institutions
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1999
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Joint Institute for Nuclear Research
- Flerov Laboratory of Nuclear Reactions
Dubna, Moskovskaya, Russia
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