Nuclear fragmentation of high-energy heavy-ion beams in water.
As a part of the physical-technical program of the heavy-ion therapy project at GSI we have investigated the nuclear fragmentation of high-energy ion beams delivered by the heavy-ion synchrotron SIS, using water as a tissue-equivalent target. For a direct comparison of fragmentation properties, beams of 10B, 12C, 14N, and 16O were produced simultaneously as secondary beams from a primary 18O beam and separated in flight by magnetic beam analysis. The Z-distributions of beam fragments produced in the water target were measured via energy loss in a large ionisation chamber and a scintillator telescope. From these data we obtained both total and partial charge-changing cross sections. In addition we have performed Bragg measurements using two parallel-plate ionization chambers and a water target of variable length. The detailed shape of the measured Bragg curves and the measured cross sections are in good agreement with model calculations based on semi-empirical formulae.
Schardt
D
D
GSI, Darmstadt, Germany.
Schall
I
I
Geissel
H
H
Irnich
H
H
Kraft
G
G
Magel
A
A
Mohar
M F
MF
Munzenberg
G
G
Nickel
F
F
Scheidenberger
C
C
Schwab
W
W
Sihver
L
L
D001895:Boron; D002244:Carbon; D004735:Energy Transfer; D007477:Ions; D009584:Nitrogen; D009686:Nuclear Physics; D010100:Oxygen; D010104:Oxygen Radioisotopes; D011829:Radiation Dosage; D011878:Radiotherapy; D017356:Synchrotrons; D014867:Water
D007477:Ions; D010104:Oxygen Radioisotopes; D014867:Water; D002244:Carbon; D009584:Nitrogen; D001895:Boron; D010100:Oxygen