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Energy loss of deuterons in 3He gas: a threshold effect |
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| Authors: | A Formicola M Aliotta G Gyürky F Raiola R Bonetti C Broggini L Campajola P Corvisiero H Costantini A D’Onofrio Z Fülöp G Gervino L Gialanella A Guglielmetti C Gustavino G Imbriani M Junker A Ordine P Prati V Roca D Rogalla C Rolfs M Romano F Schümann E Somorjai O Straniero F Strieder F Terrasi H P Trautvetter S Zavatarelli |
| Institution: | 1. Institut für Physik mit Ionenstrahlen, Ruhr-Universit?t Bochum, Bochum, Germany 2. Atomki, Debrecen, Hungary 3. Dipartimento di Fisica, Universita di Milano and INFN, Milano, Italy 4. INFN, Padova, Italy 5. Dipartimento di Scienze Fisiche, Universita Federico II and INFN, Napoli, Italy 6. Dipartimento di Fisica, Universita di Genova and INFN, Genova, Italy 7. Dipartimento di Scienze Ambientali, Seconda Universita di Napoli, Caserta and Napoli, Italy 8. Dipartimento di Fisica Sperimentale, Universita di Torino and INFN, Torino, Italy 9. Laboratori Nazionali del Gran Sasso dell’INFN, Assergi, Italy 10. Osservatorio Astronomico di Capodimonte, Napoli, Italy 11. Osservatorio Astronomico di Collurania, Teramo, Italy |
| Abstract: | The energy loss of deuterons in 3He gas was measured at E d = 15 to 100 keV using the 3He pressure dependence of the 3He(d,p)4He 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 = 18 keV they drop sharply (within 1 keV) 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. |
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