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Title: Energy loss of hydrogen projectiles in gases

Abstract

The stopping cross sections of H[sub 2], D[sub 2], He, and Ne for hydrogen projectiles in the energy range 3--20 keV per nucleon have been measured by time of flight. We compare our experimental result to the sum of the individual contributions due to excitation and ionization of the target and of the projectile, respectively, and due to charge exchange, using published cross-section data. Satisfactory agreement is found only for the He target and only at moderate projectile velocities, whereas for H[sub 2] and D[sub 2] the calculated values are about 30% too low. A Monte Carlo program allows us to simulate the measured time-of-flight spectra and to explain minor trends in the experimental data: for increased Ne gas pressure, an increased specific energy loss has been found that can be traced to different regions of impact parameters selected in our transmission geometry. This also explains, in part, the increased specific energy loss for deuterons compared to protons of equal velocity that is most evident for Ne. In contrast, a decrease of the specific energy loss with increasing pressure for He may be explained by impurities in the target gas. If we correct for the effect of impurities, the stoppingmore » cross section of He at 4 keV per nucleon is slightly smaller (0.60[times]10[sup [minus]15] eV cm[sup 2]) than published earlier (0.72[times]10[sup [minus]15] eV cm[sup 2]) and depends on the 3.8th power of projectile velocity.« less

Authors:
; ; ;  [1]
  1. Institut fuer Experimentalphysik, Johannes-Kepler-Universitaet, A-4040 Linz (Austria)
Publication Date:
OSTI Identifier:
5681367
Resource Type:
Journal Article
Journal Name:
Physical Review A; (United States)
Additional Journal Information:
Journal Volume: 48:6; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; DEUTERIUM; ION-ATOM COLLISIONS; DEUTERONS; HELIUM; HYDROGEN; CROSS SECTIONS; PROTONS; ENERGY LOSSES; KEV RANGE 01-10; KEV RANGE 10-100; NEON; ATOM COLLISIONS; BARYONS; CHARGED PARTICLES; COLLISIONS; ELEMENTARY PARTICLES; ELEMENTS; ENERGY RANGE; FERMIONS; FLUIDS; GASES; HADRONS; HYDROGEN ISOTOPES; ION COLLISIONS; ISOTOPES; KEV RANGE; LIGHT NUCLEI; LOSSES; NONMETALS; NUCLEI; NUCLEONS; ODD-ODD NUCLEI; RARE GASES; STABLE ISOTOPES; 664300* - Atomic & Molecular Physics- Collision Phenomena- (1992-)

Citation Formats

Schiefermueller, A, Golser, R, Stohl, R, and Semrad, D. Energy loss of hydrogen projectiles in gases. United States: N. p., 1993. Web. doi:10.1103/PhysRevA.48.4467.
Schiefermueller, A, Golser, R, Stohl, R, & Semrad, D. Energy loss of hydrogen projectiles in gases. United States. https://doi.org/10.1103/PhysRevA.48.4467
Schiefermueller, A, Golser, R, Stohl, R, and Semrad, D. 1993. "Energy loss of hydrogen projectiles in gases". United States. https://doi.org/10.1103/PhysRevA.48.4467.
@article{osti_5681367,
title = {Energy loss of hydrogen projectiles in gases},
author = {Schiefermueller, A and Golser, R and Stohl, R and Semrad, D},
abstractNote = {The stopping cross sections of H[sub 2], D[sub 2], He, and Ne for hydrogen projectiles in the energy range 3--20 keV per nucleon have been measured by time of flight. We compare our experimental result to the sum of the individual contributions due to excitation and ionization of the target and of the projectile, respectively, and due to charge exchange, using published cross-section data. Satisfactory agreement is found only for the He target and only at moderate projectile velocities, whereas for H[sub 2] and D[sub 2] the calculated values are about 30% too low. A Monte Carlo program allows us to simulate the measured time-of-flight spectra and to explain minor trends in the experimental data: for increased Ne gas pressure, an increased specific energy loss has been found that can be traced to different regions of impact parameters selected in our transmission geometry. This also explains, in part, the increased specific energy loss for deuterons compared to protons of equal velocity that is most evident for Ne. In contrast, a decrease of the specific energy loss with increasing pressure for He may be explained by impurities in the target gas. If we correct for the effect of impurities, the stopping cross section of He at 4 keV per nucleon is slightly smaller (0.60[times]10[sup [minus]15] eV cm[sup 2]) than published earlier (0.72[times]10[sup [minus]15] eV cm[sup 2]) and depends on the 3.8th power of projectile velocity.},
doi = {10.1103/PhysRevA.48.4467},
url = {https://www.osti.gov/biblio/5681367}, journal = {Physical Review A; (United States)},
issn = {1050-2947},
number = ,
volume = 48:6,
place = {United States},
year = {Wed Dec 01 00:00:00 EST 1993},
month = {Wed Dec 01 00:00:00 EST 1993}
}