Positron lines from subcritical heavy ion-atom collisions
Date
1987Author
Koenig, W.Bosch, F.
Kienle, P.
Kozhuharov, C.
Tsertos, Haralambos
Berdermann, E.
Huchler, S.
Wagner, W.
Source
Zeitschrift für Physik A Atomic NucleiVolume
328Issue
2Pages
129-145Google Scholar check
Keyword(s):
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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 nuclei Zu=Z1+Z2 being smaller than Zu=172. Each collision system, studied,208Pb +208Pb(Zu=164),238U+181Ta(Zu=165), and238Au(Zu=171), exhibits the emission of two positron lines with Zu-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 the e+-lines rises with a high power of Zu(ocZu 22), which is comparable to the Zu 20-dependence for the collision induced positrons. © 1987 Springer-Verlag.