2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 8, 443-446

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

A. Formicola1 - M. Aliotta1 - G. Gyürky2 - F. Raiola1 - R. Bonetti3 - C. Broggini4 - L. Campajola5 - P. Corvisiero6 - H. Costantini6 - A. D'Onofrio7 - Z. Fülöp2 - G. Gervino8 - L. Gialanella5 - A. Guglielmetti3 - C. Gustavino9 - G. Imbriani5,10 - M. Junker9 - A. Ordine5 - P. Prati6 - V. Roca5 - D. Rogalla1 - C. Rolfs1 - M. Romano5 - F. Schümann1 - E. Somorjai2 - O. Straniero11 - F. Strieder1 - F. Terrasi7 - H.P. Trautvetter1 - S. Zavatarelli6

1 Institut für Physik mit Ionenstrahlen, Ruhr-Universität 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

Received: 16 May 2000 / Revised version: 29 August 2000
Communicated by B. Povh

Abstract
The energy loss of deuterons in \ensuremath{\mathsf{^{3}He}} gas was measured at Ed = 15 to 100keV using the \ensuremath{\mathsf{^{3}He}}pressure dependence of the \ensuremath{\mathsf{^{3}He}}(d,p) \ensuremath{\mathsf{^{4}He}}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 Ed = 18keV they drop sharply (within 1keV) reaching the domain of nuclear stopping power. This threshold behavior is due to the minimum $1s\rightarrow 2s$ electron excitation of the He target atoms, i.e. it is a quantum effect. Some consequences are discussed.

PACS
26.20.+f Hydrostatic steller nucleosynthesis - 34.50.Bw Energy loss and stopping power


Copyright Società Italiana di Fisica, Springer-Verlag 2000