Ca$sup 40$(p,$gamma$)Sc$sup 41$ REACTION

Journal Article · Tue Aug 01 00:00:00 EDT 1961 · Physical Review (U.S.) Superseded in part by Phys.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

DOI:https://doi.org/10.1103/PhysRev.123.873· OSTI ID:4843938

Butler, J W

Proton capture by Ca/sup 40/ was studied by means of observations of obht the prompt gamma rays from resonance states in the compound nucleus and the delayed positrons from the decay of the ground state. Targets of CaO were prepared by the electrodeposition of Ca onto a Pt backing followed by the oxidation of the Ca and the purging of impurities by heat. These targets were bombarded by protons from a 2-Mv Van de Graaff accelerator, producing the reaction Ca/sup 40/(p, gamma ) Sc/sup 4 / 1>s. The gamma rays from this reaction were observed with the use of a 3-in. diam by 3-in. NaI(Tl) crystal and a 256channel pulse-height analyzer. Positrons from the decay of Sc/sup 41/ were detected with the use of a thin plastic phosphor, 1.5 in. diam by 0.012 in. thick. Two resonances in the reaction were observed at bombarding energies of 650 plus or minus 5 kev and 1850 plus or minus 10 kev. Two other possible resonances were observed at 1550 plus or minus 15 kev and 1630 plus or minus 15 kev. The 650-kev resonance corresponds to an excited state in Sc/sup 41/ at 1.723 plus or minus 0.011 Mev, has an integrated cross section of 0.02 ev barn (factor of 2 uncertainty either way), has a width of less than 5 kev, and involves a gamma ray whose energy was measured to be 1.71 plus or minus 0.03 Mev. The 1850-kev resonance corresponds to an excited state in sc/sup 41/ at 2.883 plus or minus 0.014 Mev, has an integrated cross section of 0.3 ev barn (factor of 2 uncertainty either way), has a width of less than 10 kev, and involves a gamma ray whose energy was measured to be 2.89 plus or minus 0.02 Mev. (auth)

• Research Organization: U.S. Naval Research Lab., Washington, D.C.
• NSA Number: NSA-15-026961
• OSTI ID: 4843938
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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, Vol. Vol: 123; Other Information: Orig. Receipt Date: 31-DEC-61
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

PHYSICS
CALCIUM
CALCIUM 40
CALCIUM OXIDES
CAPTURE
COMPOUND NUCLEI
CROSS SECTIONS
CRYSTALS
ELECTRODEPOSITION
ENERGY RANGE
EXCITATION
FOILS
GAMMA RADIATION
HEAT TREATMENTS
IMPURITIES
KEV RANGE
MEASURED VALUES
MEV RANGE
NUCLEAR MODELS
NUCLEAR REACTIONS
PLATINUM
POLYMERS
POSITRONS
PROTON BEAMS
PULSE ANALYZERS
RESONANCE
SCANDIUM 41
SCINTILLATION COUNTERS
SODIUM IODIDES
TARGETS
THALLIUM
VAN DE GRAAFF ACCELERATORS