Energy straggling of protons in Be, C, Al, and Si
Ion backscattering from solid targets of elements with prominent structure in their (p, p) scattering cross section has been used to measure the energy straggling of protons in Be, C, Al, and Si. Single-crystal targets were used in order to minimize porosity, channeling, and surface-roughness effects. In order to obtain straggling parameters from the experimental data, corrections for contributions, other than those mentioned above, to the broadening of the observed spectra were made. The energy dependence of the stopping power of the target for the protons makes a significant contribution to the broadening of the observed backscattering spectra, and must be properly accounted for if precise values of the straggling parameters are to be obtained. A procedure is described for accomplishing this. Using the experimental technique and analysis procedure described, proton straggling was evaluated in Be, C, Al, and Si in the energy range of 100--3000 keV. The results are summarized by defining f equivalent ..cap omega../..cap omega../sub B/, where ..cap omega../sub B/ is the straggling predicted by the Bohr theory. The results are: Be (E/sub res/ = 2.530 MeV), f = 1.0/sup +0.3//sub -1.0/; C (E/sub res/ = 0.47 MeV), f = 0.0/sup +1.5//sub -0.0/; C (E/sub res/ = 1.73 MeV), f = 0.9 +- 0.1; Al (E/sub res/ = 2.480 MeV), f = 1.25 +- 0.2; Al (E/sub res/ = 2.555 MeV), f = 1.25 +- 0.2; Si (E/sub res/ = 1.682 MeV), f = 1.15 +- 0.2; Si (E/sub res/ = 2.099 MeV), f = 1.4 +- 0.3. In addition to the straggling results, relative elastic scattering cross sections were determined for protons on Be (2.25--2.85 MeV, theta/sub lab/ = 170/sup 0/) and on Al (2.4--2.6 MeV, theta/sub lab/ = 170/sup 0/).
- Research Organization:
- Sandia Laboratories, Albuquerque, New Mexico 87185
- OSTI ID:
- 6480496
- Journal Information:
- Phys. Rev., B: Solid State; (United States), Journal Name: Phys. Rev., B: Solid State; (United States) Vol. 18:9; ISSN PLRBA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Energy straggling of light-ion beams
Differential cross section for proton-proton bremsstrahlung at 1. 38 GeV/c
Related Subjects
360106* -- Metals & Alloys-- Radiation Effects
654001 -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH METALS
ALUMINIUM
BARYONS
BERYLLIUM
CARBON
CHANNELING
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LOSSES
FERMIONS
HADRONS
LOSSES
METALS
NONMETALS
NUCLEONS
PROTON CHANNELING
PROTONS
SEMIMETALS
SILICON
SLOWING-DOWN
STOPPING POWER