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

Journal Article · Fri Apr 01 04:00:00 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), Journal Name: IEEE Trans. Nucl. Sci.; (United States) Vol. 30:2; ISSN IETNA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL COMPOUNDS
ALKALI METALS
BARYON REACTIONS
CALIBRATION STANDARDS
CHARGED-PARTICLE REACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY RANGE
EVEN-EVEN NUCLEI
FLUORINE 19 TARGET
GAMMA RADIATION
GAMMA SOURCES
GERMANIUM
HADRON REACTIONS
HALIDES
HALOGEN COMPOUNDS
INORGANIC PHOSPHORS
IODIDES
IODINE COMPOUNDS
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
LITHIUM
MEASURING INSTRUMENTS
METALS
MEV RANGE
MEV RANGE 01-10
NAI DETECTORS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
OXYGEN 16
OXYGEN ISOTOPES
PHOSPHORS
PROTON REACTIONS
RADIATION DETECTORS
RADIATION SOURCES
RADIATIONS
SCINTILLATION COUNTERS
SODIUM COMPOUNDS
SODIUM IODIDES
SOLID SCINTILLATION DETECTORS
STABLE ISOTOPES
STANDARDS
TARGETS