Photofission of Heavy Nuclei at Energies up to 4 GeV

Total photofission cross sections for 238U, 235U, 233U, 237Np, 232Th, and natPb have been measured simultaneously, using tagged photons in the energy range Egamma=0.17-3.84 GeV. This was the first experiment performed using the Photon Tagging Facility in Hall B at Jefferson Lab. Our results show tha...

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Bibliographic Details
Published in:	Physical review letters Vol. 84; no. 25
Main Authors:	Catalina Cetina, Barry L. Berman, William Briscoe, Philip L. Cole, Gerald Feldman, Peter Heimberg, Luc Y. Murphy, Sasha A. Philips, Juan Carlos Sanabria, Hall Crannell, Alberto Longhi, Daniel I. Sober, G. Ya. Kezerashvili
Format:	Journal Article
Language:	English
Published:	United States 19-06-2000
Subjects:	CROSS SECTIONS ENERGY RANGE FISSION HEAVY NUCLEI PHOTOFISSION PHOTONS PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PROBABILITY
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Summary:	Total photofission cross sections for 238U, 235U, 233U, 237Np, 232Th, and natPb have been measured simultaneously, using tagged photons in the energy range Egamma=0.17-3.84 GeV. This was the first experiment performed using the Photon Tagging Facility in Hall B at Jefferson Lab. Our results show that the photofission cross section for 238U relative to that for 237Np is about 80%, implying the presence of important processes that compete with fission. We also observe that the relative photofission cross sections do not depend strongly on the incident photon energy over this entire energy range. If we assume that for 237Np the photofission probability is equal to unity, we observe a significant shadowing effect starting below 1.5 GeV.
Bibliography:	JLAB-PHY-00-33; DOE/ER/40150-2105; nucl-ex/0004004 USDOE Office of Energy Research (ER) (US) AC05-84ER40150
ISSN:	0031-9007 1079-7114