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 / Formicola, A.; Aliotta, M.; Gyürky, G.; Raiola, F.; Bonetti, R.; Broggini, C.; Campajola, L.; Corvisiero, P.; Costantini, H.; D'Onofrio, A.; Fülöp, Z.; Gervino, G.; Gialanella, L.; Guglielmetti, A.; Gustavino, C.; Imbriani, Gianluca; Junker, M.; Ordine, A.; Prati, P.; Roca, Vincenzo; Rogalla, D.; Rolfs, C.; Romano, Mario; Schümann, F.; Somorjai, E.; Straniero, O.; Strieder, F.; Terrasi, F.; Trautvetter, H. P.; Zavatarelli, S.. - In: THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI. - ISSN 1434-6001. - STAMPA. - 8:4(2000), pp. 443-446. [10.1007/s100530050054]
Energy loss of deuterons in He-3 gas: a threshold effect
IMBRIANI, GIANLUCA;ROCA, VINCENZO;ROMANO, MARIO;
2000
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
