PHOTONUCLEAR ACTIVATION BY 20.5-Mev GAMMA RAYS
Journal Article
·
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
The photonuclear activation cross section of elements whose ( gamma ,n) cross sections lead to a suitable positron activity is measured using monochromatic gamma rays from the T3(p, gamma )He4 reaction, The gamma rays are monitored by a 3-in. diam by 4-in. long sodlum iodide crystal and calibrated with a 41/2 x 6 in. crystal whose response curve to the gamma rays is determined. The absorption coefficient of these photons in NaI is determined by a good- geometry transmission experiment. The positron activlty is determined by a coincldence detector, consisting of two 5-in. diam by 2-in. long NaI crystals set on the annihilation radiation photopeaks. This detector is calibrated against a F/sup 18/. positron source standardized in a 2 pi flow couster, The 20.1 to 21.2 Mev. Structure is not observed. The ( gamma ,n) activation cross section is measured at 20.5 Mev for O/sup 16/, Cr/sup 50/, fe/sup 54/, Cu/sup 63/, Zn/sup 64/ , Mo/sup 92, sb/sup 121/ and Pr/sup 141/, giving cross sections of 0.60 plus or minus 0.12, 29.1 P 6.0, 30.0 plus or minus 4.8, 52.5 plus or minus 2.5, 35,7 plus or minus l.8, 35,4 plus or minus 2.5, 33.4 2.7, 51.7 plus or minus 5.5barns, respectively. (auth)
- Research Organization:
- Univ. of Pennsylvania, Philadelphia
- NSA Number:
- NSA-16-018512
- OSTI ID:
- 4840726
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 126; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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CROSS SECTIONS FOR THE ($gamma$,n) REACTION IN Cu$sup 63$, Cu$sup 65$, Zn$sup 64$, Sb$sup 121$ AND Pr$sup 141$, MEASURED WITH MONOCHROMATIC GAMMA RAYS
Journal Article
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Tue Aug 01 00:00:00 EDT 1961
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
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PHOTONUCLEAR ACTIVATION BY 20 MEV GAMMA RAYS. Technical Report No. 9
Technical Report
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Sat Dec 31 23:00:00 EST 1960
·
OSTI ID:4817345
CROSS SECTIONS FOR THE ($gamma$,n) REACTION IN Cu$sup 63$, Cu$sup 65$, Zn$sup 64$, Sb$sup 121$ AND Pr$sup 141$, MEASURED WITH MONOCHROMATIC GAMMA RAYS
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Tue Feb 28 23:00:00 EST 1961
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OSTI ID:4049991
Related Subjects
ABSORPTION
ACTIVATION
ANTIMONY 121
CARBON 11
CARBON 12
CHROMIUM 50
COINCIDENCE METHODS
COPPER 63
CROSS SECTIONS
CRYSTALS
ENERGY RANGE
FLUORINE 18
FLUORINE 19
GAMMA RADIATION
GAMMA SOURCES
HELIUM 4
IRON 54
MOLYBDENUM 92
MONITORING
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
OXYGEN 16
PHOTOPRODUCTION
PHYSICS
POSITRONS
PRASEODYMIUM 141
PROTONS
RADIATION DETECTORS
SODIUM IODIDES
STANDARDS
TRITIUM
ZINC 64
ACTIVATION
ANTIMONY 121
CARBON 11
CARBON 12
CHROMIUM 50
COINCIDENCE METHODS
COPPER 63
CROSS SECTIONS
CRYSTALS
ENERGY RANGE
FLUORINE 18
FLUORINE 19
GAMMA RADIATION
GAMMA SOURCES
HELIUM 4
IRON 54
MOLYBDENUM 92
MONITORING
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
OXYGEN 16
PHOTOPRODUCTION
PHYSICS
POSITRONS
PRASEODYMIUM 141
PROTONS
RADIATION DETECTORS
SODIUM IODIDES
STANDARDS
TRITIUM
ZINC 64