THRESHOLDS OBSERVED IN THE C*SUP 12/(*cap alpha/,n)O*SUP 15/, Si*SUP 28/ (*cap alpha/,n)S*SUP 31/, S*SUP 32/(*cap alpha/,n)Ar*SUP 35/, S*SUP 34/(*cap alpha/,n)Ar*SUP 37/, AND Cl*SUP 35/(p,n)Ar*SUP 35/ REACTIONS

Journal Article · Fri Feb 15 04:00:00 EST 1963 · Physical Review (U.S.) Superseded in part by Phys.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.129.1723· OSTI ID:4706892

Nelson, J W; Carter, E B; Mitchell, G E; Davis, R H

The following thresholds have been measured in the ( alpha ,n) Si/sup 28/ 9.30 plus or minus 0.05, 10.55 plus or minus 10.05, 11.83 plus or minus 0.05, 12.78 plus or minus 0.05; S/sup 32/ 9.846 plus or minus 0.020, 10.89 plus or minus 0.0111.97 plus or minus 0.08; S/sup 34/ 5.17 plus or minus 0.10, 5.96 plus or minus 0.05, 6.90 plus or minus 0.05, 8ssults are in agreement with previously published results except for the S/sup 32/( alpha ,n)Ar/ sup 35/ ground threshold which is 140 kev higher than expected. To confirm the value of the mass of Ar/sup 35/, the Cl/sup 35/(p,n)Ar/sup 35/ threshold energy was measured and is 6.942 plus or minus 0.020 Mev. Since this result agrees with the accepted value of the Ar/sup 35/ mass, the 140-kev discrepancy was not resolved. In the C/sup 12/( alpha ,n)O/sup 15/ excitation curve a prominent resonance of half-width 220 plus or minus 60 kev was found corresponding to a level in O/sup 16/ of excitation 18.10 plus or minus 0.08 Mev. The cross section rises to about 22 mb at the peak of this resonance. Half-life determinations yielded the values: O/sup 15/ 122.6 plus or minus 1.0, S/sup 31/ 2.56 plus or minus 0.10, and Ar/sup 35/ 1.78 plus or minus 0.03 sec. (auth)

• Research Organization: Florida State Univ., Tallahassee
• NSA Number: NSA-17-011715
• OSTI ID: 4706892
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 129; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA PARTICLES
ARGON 35
ARGON 37
CARBON 12
CHLORINE 35
CROSS SECTIONS
ENERGY LEVELS
EXCITATION
EXCITATION FUNCTION
HALF-LIFE
LIFETIME
MASS
MEASURED VALUES
NEUTRONS
NUCLEAR REACTIONS
OXYGEN 15
OXYGEN 16
PHYSICS
PROTONS
RESONANCE
SILICON 28
SILICON 31
SULFUR 32
SULFUR 34
THRESHOLD ENERGY
WIDTH