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Correlated two-photon lines from 6-MeV/nucleon U+Th, U+U, and Th+Th collisions (1989)

Danzmann, Karsten,
Meyerhof, W. E.,
Montenegro, E. C.,
Dillard, E.,
Hülskötter, H. P.,
Guardala, N.,
Spooner, D. W.,
Kotlinski, B.,
Cline, D.,
Kavka, A.,
Beausang, C. W.,
Burde, J.,
Deleplanque, M. A.,
Diamond, R. M.,
McDonald, R. J.,
Macchiavelli, A. O.,
Rude, B. S.,
Stephens, F. S.,
Molitoris, J. D.

Abstract

We find that narrow lines at 1043 and 1062 keV in the summed-energy, 180°-correlated two-photon spectrum from ≊6-MeV/nucleon U+Th collisions can be produced by cascades from high-spin states (32+) in 238U. We see no evidence for narrow two-photon lines in U+Th, Th+Th, and U+U collisions corresponding to the electron-positron lines seen by others: In the summed-energy region between 1.2 and 2.0 MeV, we set an upper limit for the cross section of 6×10-31 cm2 averaged over a target thickness of 1 mg/cm2.

Publication details

Download	http://edoc.mpg.de/372213
Repository	Max Planck Society - eDocument Server (Germany)
Type	Article