Measurement of the total photoabsorption cross section on a proton in the energy range 600-1500 MeV at the GRAAL

Journal Article · Mon Jan 14 23:00:00 EST 2008 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S1063778808010080· OSTI ID:22028215

Bartalini, O ^[1]; Bellini, V ^[2]; Bocquet, J P; Calvat, P ^[3]; D'Angelo, A ^[1]; Didelez, J -P ^[4]; Di Salvo, R; Fantini, A ^[1]; Ghio, F; Girolami, B ^[5]; Guidal, M ^[4]; Giusa, A ^[2]; Hourany, E ^[4]; Ignatov, A S ^[6]; Kunne, R ^[4]; Lapik, A M; Sandri, P Levi ^[7]; Lleres, A ^[3]; Moricciani, D ^[1]; Mushkarenkov, A N ^[6] ; others, and

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1. Universita di Roma II Tor Vergata (Italy)
2. Universita di Catania (Italy)
3. Laboratoire de Physique Subatomique et de Cosmologie, IN2P3 (France)
4. Institut de Physique Nucleaire d'Orsay, IN2P3 (France)
5. INFN Sezione di Roma I (Italy)
6. Russian Academy of Sciences, Institute for Nuclear Research (Russian Federation)
7. INFN Laboratori Nazionali di Frascati (Italy)

The total photoabsorption cross section on a free proton was measured at the GRAAL facility in the energy range E{sub {gamma}} = 600-1500 MeV. The large-aperture LAGRAN{gamma}E detector and a liquid hydrogen target were used in the experiment performed with a back-scattered Compton gamma beam. To improve the accuracy, two alternative methods were employed. First, a subtraction method of using empty-target measurements allowed the cross section {sigma}{sub tot} to be evaluated directly because of a low level of the electromagnetic background. Second, an algorithm for evaluating {sigma}{sub tot} on the basis of summing the dominating partial cross sections was developed. Experimental results obtained for {sigma}{sub tot} by the two methods are compared with existing data.

• OSTI ID: 22028215
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 1 Vol. 71; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALGORITHMS
APERTURES
COMPARATIVE EVALUATIONS
COMPTON EFFECT
ELECTROMAGNETIC RADIATION
HYDROGEN
HYDROGEN 1 TARGET
LIQUIDS
MEV RANGE
PHOTON BEAMS
PHOTON-PROTON INTERACTIONS
PHOTONUCLEAR REACTIONS
PROTONS
TOTAL CROSS SECTIONS