Time delay effects on K x-ray production probability in deep inelastic U + U and U + Pb nuclear reactions

Journal Article · Wed Jul 01 00:00:00 EDT 1987 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.36.143· OSTI ID:5977201

Nessi, M; Stoller, C; Morenzoni, E; Woelfli, W; Meyerhof, W E; Molitoris, J D; Grosse, E; Michel, C

If an atomic collision is accompanied by a deep inelastic nuclear reaction with a time delay ..delta..T, a phase change which affects the ionization probability P/sub K/ of the target- and projectile-like products is introduced between the incident and outgoing ionization amplitudes. In a deep inelastic nuclear reaction, the nuclear reaction time ..delta..T is monotonically related to the total kinetic energy loss (-Q) of the reaction products. Therefore a measurement of P/sub K/ as a function of Q then yields ..delta..T. The K-shell ionization probability P/sub K/ has been measured in the deep inelastic reactions U + U and U + Pb at a beam energy of 1785 MeV as a function of the total kinetic energy loss -Q. P/sub K/ was determined for Q values down to -190 MeV. After subtraction of the ionization induced by the internal conversion of ..gamma.. rays, a strongly Q-dependent P/sub K/ is found, in qualitative agreement with theoretical predictions. From the data we infer a nuclear reaction time of approximately 1 x 10/sup -21/ s at Q = -100 MeV. The observed reaction times agree fairly well with the predictions of the classical nuclear reaction models used to describe deep inelastic scattering processes.

• Research Organization: Institut fuer Mittelenergiephysik der Eidgenoessische Technische Hochschule, CH-8093 Zuerich, Switzerland
• OSTI ID: 5977201
• Journal Information: Phys. Rev. C; (United States), Vol. 36:1
• Country of Publication: United States
• Language: English

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