An absolutely calibrated source of 6. 13 MeV gamma-rays

Journal Article · Fri Apr 01 00:00:00 EST 1983 · IEEE Trans. Nucl. Sci.; (United States)

DOI:https://doi.org/10.1109/TNS.1983.4332573· OSTI ID:5956901

Mach, H; Rogers, D W.O.

At the 340 keV resonance in the /sup 19/F(p, ..cap alpha gamma..)/sup 16/O reaction, after kinematic corrections, there is a 1:1 correspondence between the 55/sup 0/ yield of alpha particles feeding the 6.13 MeV state and the yield of 6.13 MeV photons observed at 55/sup 0/ to the proton beam. The 55/sup 0/ intensities of alpha particles feeding the various states in /sup 16/O were found to be: ..cap alpha../sub 6/: ..cap alpha../sub 7/ = <0.14: 100: 0.08: 2.6 which implies the only non-negligible contaminant is a 7.12 MeV gamma-ray radiation with an intensity of 2.6%. After a number of small corrections, including those for photon attenuation in the target backing and air, the fluence of 6.13 MeV gamma-rays can be determined absolutely with an uncertainty of about 1%. Excellent agreement was obtained in a comparison of the calculated and measured efficiencies of a 5'' x 4'' NaI detector. The calibration of Ge(Li) detectors required an aluminium coated target to avoid a Doppler tail on the 6.13 MeV photon peaks caused by /sup 16/O nuclei recoiling from the surface of the CaF/sub 2/ target.

• Research Organization: Division of Physics, National Research Council of Canada, Ottawa KIA OR6
• OSTI ID: 5956901
• Journal Information: IEEE Trans. Nucl. Sci.; (United States), Vol. 30:2
• Country of Publication: United States
• Language: English

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