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

A Formicola, M Aliotta, G Gyurky, F Raiola, R Bonetti, C Broggini, L Campajola, P Corvisiero, H Costantini, A D'Onofrio, Z Fulop, G Gervino, L Gialanella, A Guglielmetti, C Gustavino, G Imbriani, M Junker, A Ordine, P Prati, V RocaD Rogalla, C Rolfs, M Romano, F Schumann, E Somorjai, O Straniero, F Strieder, F Terrasi, H P Trautvetter, S Zavatarelli

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)443-446
Number of pages4
JournalEuropean Physical Journal A: Hadrons and Nuclei
Issue number4
Publication statusPublished - Aug 2000




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