The energy loss of deuterons in He-3 gas was measured at E-d = 15 to 100keV using the He-3 pressure dependence of the He-3(d,p)He-4 cross-section at a given incident energy. At the highest energies, the observed energy loss is in good agreement with a standard compilation. However, with decreasing energy the experimental values drop steadily below the theoretical values and near E-d = 18keV they drop sharply (within 1keV) reaching the domain of nuclear stopping power. This threshold behavior is due to the minimum 1s --> 2s electron excitation of the He target atoms, i.e. it is a quantum effect. Some consequences are discussed.

Energy loss of deuterons in He-3 gas: a threshold effect

GERVINO, Gianpiero;
2000-01-01

Abstract

The energy loss of deuterons in He-3 gas was measured at E-d = 15 to 100keV using the He-3 pressure dependence of the He-3(d,p)He-4 cross-section at a given incident energy. At the highest energies, the observed energy loss is in good agreement with a standard compilation. However, with decreasing energy the experimental values drop steadily below the theoretical values and near E-d = 18keV they drop sharply (within 1keV) reaching the domain of nuclear stopping power. This threshold behavior is due to the minimum 1s --> 2s electron excitation of the He target atoms, i.e. it is a quantum effect. Some consequences are discussed.
2000
8
443
446
NUCLEAR ASTROPHYSICS; CROSS-SECTION
A. Formicola; M. Aliotta; G. Gyurky; F. Raiola; R. Bonetti; C. Broggini; L. Campajola; P. Corvisiero; H. Costantini; A. D'Onofrio; Z. Fulop; G. Gervin...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/47576
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