gamma. width of the unbound 5. 17 MeV level of sup 14 O and the hot'' CNO cycle

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Physical Review (Section) C: Nuclear Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevC.40.1887· OSTI ID:5015914

Fernandez, P B; Adelberger, E G; Garcia, A ^[1]

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1. Physics Department, University of Washington, Seattle, Washington 98195 (US)

We have measured the {gamma}-ray branching ratio {Gamma}{sub {gamma}}/{Gamma} of the unbound 5.17 MeV first excited state in {sup 14}O using the {sup 12}C({sup 3}He,{ital n}{gamma}) reaction at {ital E}{sub {sup 3}He}=9.35 MeV. We detected coincidences between {ital n}{sub 1} neutrons populating the {sup 14}O state and 5.17 MeV {gamma} rays from its decay, and obtained {Gamma}{sub {gamma}}/{Gamma}=(7.2{plus minus}3.5){times}10{sup {minus}5}. When combined with the known total width {Gamma}=38.1{plus minus}1.8 keV, our branching ratio corresponds to {Gamma}{sub {gamma}}=2.7{plus minus}1.3 eV. We use this {gamma}-ray width, together with previously measured nonresonant {sup 13}C({ital p},{gamma}{sub 1}) data, to find the {sup 13}N({ital p},{gamma}) reaction rate at astrophysical energies, thereby determining the stellar environments where hydrogen burning through hot'' or {beta}-limited CNO cycle can occur.

• OSTI ID: 5015914
• Journal Information: Physical Review (Section) C: Nuclear Physics; (USA), Journal Name: Physical Review (Section) C: Nuclear Physics; (USA) Vol. 40:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASTROPHYSICS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BRANCHING RATIO
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
CNO CYCLE
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
FERMIONS
GAMMA RADIATION
HADRONS
HELIUM 3 REACTIONS
HYDROGEN
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
MEV RANGE
MEV RANGE 01-10
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NONMETALS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
OXYGEN 14
OXYGEN ISOTOPES
RADIATIONS
RADIOISOTOPES
STAR BURNING
TARGETS