Proposal to Set Up a Tagged Photon Facility and to Survey Photon Induced Reactions in 50 - 300 BeV Region

Technical Report · Fri Jan 01 04:00:00 EST 1971

DOI:https://doi.org/10.2172/1973959· OSTI ID:1973959

Margolis, B. ^[1]; Patel, P. M. ^[1]; Ross, W. ^[1]; Stairs, D. G. ^[1]; Bird, L. ^[2]; Halliwell, C. ^[2]; Morrison, R. ^[2]; Walters, John ^[2]; Coleman, E. ^[3]; Fesesse, T. ^[3]; Makdisi, Y. ^[3]; Becker, U. J. ^[4]; Biggs, P. ^[4]; Busza, W. ^[4]; Chen, M. ^[4]; Nash, T. ^[4]; Sadrozinski, H. F. W. ^[4]; Ting, Samuel C. C. ^[4]; Wu, Sau Lan ^[4]; Wu, Tai Tsun ^[4]

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1. McGill Univ., Montreal, QC (Canada)
2. Carleton Univ., Ottawa, ON (Canada)
3. Univ. of Minnesota, Minneapolis, MN (United States)
4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

We propose to construct a tagged photon facility in the 50-300 BeV region to study the general features of photo-induced reactions. We produce the $$\gamma$$ beam from $$\pi^o$$ decays from a Be target, converting the $$\gamma$$ rays into electron pairs. With a beam transport system, we collect 10⁸ electrons on to a tagging target which produces 4 x 10⁵ tagged photons with a resolution $$Sp/_p$$ =±0.5% in the energy band 120-200 BeV. Comparing this beam with other tagged photon beams, we note that the 4 x 10⁵ $$\gamma$$-rays (or 10⁶ total equivalent quanta in the total energy band) are distributed uniformly over one second of spill time, whereas in low energy tagged photon beams from electron accelerators the same amount of beam is distributed over 30 millisecond or less. This feature enables NAL to use large solid angle detectors and to perform accurate experiments with coincidence techniques.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); US Atomic Energy Commission (AEC)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1973959
• Report Number(s): FERMILAB-PROPOSAL--0144; oai:inspirehep.net:871808
• Country of Publication: United States
• Language: English

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