sup 17 O( sup 3 He, d ) sup 18 F reaction and its implication in the sup 17 O destruction in the CNO cycle in stars

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

DOI:https://doi.org/10.1103/PhysRevC.40.1972· OSTI ID:5003271

Landre, V; Aguer, P; Bogaert, G; Lefebvre, A; Thibaud, J P ^[1]; Fortier, S; Maison, J M; Vernotte, J ^[2]

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1. Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, 91405 Orsay, France (FR)
2. Institut de Physique Nucleaire, 91406 Orsay, France (FR)

The proton stripping reaction {sup 17}O({sup 3}He,{ital d}){sup 18}F has been used to reinvestigate the proton widths of the states in {sup 18}F near the proton threshold. Distorted-wave angular distributions were calculated using appropriate methods for stripping to unbound states. The deduced proton width for the level at {ital E}{sub {ital x}}=5.673 MeV ({ital J}{sup {pi}}=1{sup {minus}}) is significantly larger than a previous value obtained from a direct radiative capture experiment. A subthreshold state at {ital E}{sub {ital x}}=5.603 MeV ({ital J}{sup {pi}}=1{sup +}) was found to have a rather large proton reduced width so that this state contributes significantly to the astrophysical {ital S} factor at low energy. These measurements lead to substantial changes in the stellar reaction rate for the {sup 17}O({ital p},{alpha}){sup 14}N reaction. This result is discussed in relation to recent observation of the isotopic abundance ratio {sup 16}O/{sup 17}O in red giant stars. In addition, the nuclear structure of {sup 18}F is studied via the measurement of spectroscopic factors for most of the levels in {sup 18}F bound against proton decay.

• OSTI ID: 5003271
• 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

Related Subjects

640102 -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
651320* -- Nuclear Properties & Reactions
A=6-19
Experimental
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABUNDANCE
ALPHA PARTICLES
ANGULAR DISTRIBUTION
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CNO CYCLE
CROSS SECTIONS
DEUTERONS
DIRECT REACTIONS
DISTORTED WAVE THEORY
DISTRIBUTION
ENERGY LEVELS
FLUORINE 18
FLUORINE ISOTOPES
GIANT STARS
HADRON REACTIONS
HELIUM 3 REACTIONS
HOURS LIVING RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
NITROGEN 14
NITROGEN ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-ODD NUCLEI
OXYGEN 17 TARGET
PICKUP REACTIONS
PROTON REACTIONS
RADIOISOTOPES
RED GIANT STARS
S PROCESS
SPECTROSCOPIC FACTORS
STABLE ISOTOPES
STAR BURNING
STAR EVOLUTION
STARS
STRIPPING
TARGETS
TRANSFER REACTIONS