Stopping powers of Al and Mo for protons from 0.3 to 3.0 MeV

Citation
N. Shiomi-tsuda et al., Stopping powers of Al and Mo for protons from 0.3 to 3.0 MeV, NUCL INST B, 159(3), 1999, pp. 123-132
Citations number
29
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
ISSN journal
0168583X → ACNP
Volume
159
Issue
3
Year of publication
1999
Pages
123 - 132
Database
ISI
SICI code
0168-583X(199911)159:3<123:SPOAAM>2.0.ZU;2-U
Abstract
Stopping powers of Al and Mo have been measured for protons in the respecti ve energy ranges of 0.3-3.0 and 0.4- 3.0 MeV with a surface barrier silicon detector. The uncertainty of the present results is +/-0.35%. Above 0.8 Me V the present results for Al agree well with the Aarhus data of Anderson et al. [Phys. Rev. A 16 (1977) 1929] and the tabulated values of ICRU Report 49 (Stopping Powers and Ranges for Protons and Alpha Particles (Internation al Commission on Radiation Units and Measurements, 1993)) (ICRU values). Be low 0.8 MeV, however, ratios of the present data for Al to ICRU values show a slight decrease with decreasing proton energy. The decrease amounts to s imilar to 1% at 0.3 MeV. In the case of Mo the ratios also decrease with de creasing proton energy below 2.0 MeV. The decrease reaches similar to 8% at around the lowest energy, 0.4 MeV. Because the Bethe-Bloch formula is know n to well reproduce stopping powers for protons above similar to 1 MeV, the mean excitation energies, the I values, of Al and Mo have been extracted f rom the results for 1-3 MeV protons. These I values are compared with publi shed values. (C) 1999 Elsevier Science B.V. All rights reserved.