Fast Electron Production at Intermediate Energies: Evidence for Fermi Shuttle Acceleration and for Deviations from Simple Relativistic Kinematics

G. Lanzanò; E. De Filippo; D. Mahboub; H. Rothard; S. Aiello; A. Anzalone; S. Cavallaro; A. Elanique; E. Geraci; M. Geraci; F. Giustolisi; A. Pagano; G. Politi

doi:10.1103/PhysRevLett.83.4518

Fast Electron Production at Intermediate Energies: Evidence for Fermi Shuttle Acceleration and for Deviations from Simple Relativistic Kinematics

G. Lanzanò, E. De Filippo, D. Mahboub, H. Rothard, S. Aiello, A. Anzalone, S. Cavallaro, A. Elanique, E. Geraci, M. Geraci, F. Giustolisi, A. Pagano, and G. Politi

Phys. Rev. Lett. 83, 4518 – Published 29 November 1999

Abstract

We measured fast electron velocity spectra with the multidetector ARGOS in a large angular range, for atomic collisions induced by a $45 A MeV$ $^{58} Ni$ beam on different solid targets. The velocity centroids of binary encounter electrons are shifted towards lower velocities than predicted by simple two-body relativistic kinematics, independently of target material and thickness. With increasing target atomic number, the high energy tails of the spectra exhibit an unexpectedly large number of very fast electrons. A multiple scattering (Fermi-shuttle) mechanism is invoked to explain this effect.

Received 2 June 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.4518

Authors & Affiliations

G. Lanzanò¹, E. De Filippo¹, D. Mahboub², H. Rothard³, S. Aiello¹, A. Anzalone², S. Cavallaro², A. Elanique², E. Geraci¹, M. Geraci¹, F. Giustolisi², A. Pagano¹, and G. Politi¹

¹Istituto Nazionale di Fisica Nucleare and Dipartimento di Fisica, Corso Italia 57, 95129 Catania, Italy
²INFN-LNS and Dipartimento di Fisica, via Santa Sofia 44, 95123 Catania, Italy
³CIRIL-Ganil (CEA/CNRS/ISMRA, BP 5133, F-14070 Caen Cedex 05, France