The stopping power of atomic and molecular deuterons in 3He gas was measured over the range E d = 10 to 100 keV using the 3He pressure dependence of the 3He(d,p) 4He reaction yield. At energies above 30 keV, the observed stopping power values are in good agreement with a standard compilation. However, near 18 keV the experimental values drop by a factor 50 below the extrapolated values of the compilation. In a simple model, the behavior is due to the minimum 1s → 2s electron excitation of the He target atoms (= 19.8 eV, corresponding to E d = 18.2 keV), i.e. it is a quantum effect, by which the atoms become nearly transparent for the ions.
Stopping power of low-energy deuterons in He-3 gas / Raiola, F; Gyurky, G; Aliotta, M; Formicola, A; Bonetti, R; Broggini, C; Campajola, L; Corvisiero, P; Costantini, H; D'Onofrio, A; Fulop, Z; Gervino, G; Gialanella, L; Guglielmetti, A; Gustavino, C; Imbriani, Gianluca; Junker, M; Kavanagh, Rw; Moroni, Pgp; Ordine, A; Prati, P; Roca, Vincenzo; Rogalla, D; Rolfs, C; Romano, Mario; Schumann, F; Somorjai, E; Straniero, O; Strieder, F.; Terrasi, F; Trautvetter, Hp; Zavatarelli, S.. - In: THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI. - ISSN 1434-6001. - STAMPA. - 10:4(2001), pp. 487-491. [10.1007/s100500170107]
Stopping power of low-energy deuterons in He-3 gas
IMBRIANI, GIANLUCA;ROCA, VINCENZO;ROMANO, MARIO;
2001
Abstract
The stopping power of atomic and molecular deuterons in 3He gas was measured over the range E d = 10 to 100 keV using the 3He pressure dependence of the 3He(d,p) 4He reaction yield. At energies above 30 keV, the observed stopping power values are in good agreement with a standard compilation. However, near 18 keV the experimental values drop by a factor 50 below the extrapolated values of the compilation. In a simple model, the behavior is due to the minimum 1s → 2s electron excitation of the He target atoms (= 19.8 eV, corresponding to E d = 18.2 keV), i.e. it is a quantum effect, by which the atoms become nearly transparent for the ions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
