Fragmentation of 200 and 244 MeV/u carbon beams in thick tissue-like absorbers.
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.
Golovchenko
A N
AN
Flerov Lab. of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, Russian Federation. sasha@cv.jinr.ru
Skvarc
J
J
Ilic
R
R
Sihver
L
L
Bamblevski
V P
VP
Tretyakova
S P
SP
Schardt
D
D
Tripathi
R K
RK
Wilson
J W
JW
Bimbot
R
R
D001608:Beryllium; D002244:Carbon; D002247:Carbon Isotopes; D007477:Ions; D008094:Lithium; D008962:Models, Theoretical; D011092:Polyethylene Glycols; D019904:Polymethyl Methacrylate; D011829:Radiation Dosage; D011853:Radiobiology; D017356:Synchrotrons; D014867:Water
D002247:Carbon Isotopes; D007477:Ions; D014867:Water; C028827:CR 39; D011092:Polyethylene Glycols; D002244:Carbon; D019904:Polymethyl Methacrylate; D008094:Lithium; D001608:Beryllium