Electronic stopping in a He-H{sub 2} mixture substantially exceeds Bragg{close_quote}s rule value

Journal Article · Mon Apr 01 00:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.76.3104· OSTI ID:284736

Golser, R; Semrad, D ^[1]; Aumayr, F ^[2]

---

1. Institut fuer Experimentalphysik, Johannes-Kepler-Universitaet, A-4040 Linz (Austria)
2. Institut fuer Allgemeine Physik, Technische Universitaet Wien, A-1040 Wien (Austria)

We measured the energy loss of 8 keV deuterons in mixtures of He and H{sub 2} gases using a time-of-flight technique. According to Bragg{close_quote}s rule the stopping cross section {var_epsilon} of a mixture of nonreacting gases should be the weighted average of the stopping cross sections of its constituents. Experimentally we find {var_epsilon} to exceed the Bragg value by more than 50{percent}. This can be traced to large differences in the electron capture and electron loss cross sections of He and H{sub 2}, respectively, that strongly enhance energy losses due to charge-changing collisions. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 284736
• Journal Information: Physical Review Letters, Vol. 76, Issue 17; Other Information: PBD: Apr 1996
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HELIUM
ATOM-ATOM COLLISIONS
HYDROGEN
ATOM-MOLECULE COLLISIONS
DEUTERON BEAMS
DEUTERONS
KEV RANGE 01-10
STOPPING POWER
ENERGY LOSSES
ELECTRON CAPTURE
ELECTRON LOSS
MIXTURES