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Digitale Medien

Positron lines from subcritical heavy ion-atom collisions (1987)

Koenig, W. ; Bosch, F. ; Kienle, P. ; [weitere]

Springer

The European physical journal 328 (1987), S. 129-145

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Details

ISSN: 1434-601X

Schlagwort(e): 14.60.Cd ; 25.70.Cd ; 25.70.Ef

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Positron lines were observed in heavy ion-atom collisions at bombarding energies close to the Coulomb barrier in subcritical systems with the sum of the atomic numbers of the colliding nucleiZ u =Z 1+Z 2 being smaller thanZ u =172. Each collision system, studied,208Pb +208Pb(Zu=164),238U+181Ta(Zu=165), and238Au(Zu=171), exhibits the emission of two positron lines withZ u -independent c.m. energies of ∼ 258 keV and ∼ 340 keV, and with widths of about 30 keV, superimposed on continuous positron spectra from nuclear pair decay and pair emission induced by the time changing Coulomb field of the collision. The production cross section of thee +-lines rises with a high power ofZ u (ocZ u 22), which is comparable to theZ u 20-dependence for the collision induced positrons.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01290655

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