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Title: Measurement of the internal pair emission branch of the 7. 654-MeV state of /sup 12/C, and the rate of the stellar triple-. cap alpha. reaction

Abstract

The internal pair decay of the 0/sup +/ 7.65-MeV state of /sup 12/C has been observed in coincidence with inelastic protons from /sup 12/C(p,p')/sup 12/C(7.65), using a plastic scintillator of essentially 4..pi.. sr solid angle. The branching ratio measured, GAMMA/sub ..pi..//GAMMA = (6.0 +- 1.1) x 10/sup -6/, is in excellent agreement with the previous measurement by Alburger, and reduces the uncertainty in the stellar triple-..cap alpha.. reaction rate by almost a factor of 2. Implications for the astrophysical production of /sup 12/C and /sup 16/O are discussed.

Authors:
; ;
Publication Date:
Research Org.:
Cyclotron Laboratory and Physics Department, Michigan State University, East Lansing, Michigan 48824
OSTI Identifier:
7228632
Resource Type:
Journal Article
Journal Name:
Phys. Rev., C; (United States)
Additional Journal Information:
Journal Volume: 15:3
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CARBON 12; ENERGY-LEVEL TRANSITIONS; INTERNAL PAIR PRODUCTION; CARBON 12 TARGET; PROTON REACTIONS; INELASTIC SCATTERING; STAR MODELS; NUCLEOSYNTHESIS; BRANCHING RATIO; MEV RANGE 01-10; OXYGEN 16; BARYON REACTIONS; CARBON ISOTOPES; CHARGED-PARTICLE REACTIONS; ENERGY RANGE; EVEN-EVEN NUCLEI; HADRON REACTIONS; INTERACTIONS; ISOTOPES; LIGHT NUCLEI; MATHEMATICAL MODELS; MEV RANGE; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; OXYGEN ISOTOPES; PAIR PRODUCTION; SCATTERING; STABLE ISOTOPES; TARGETS; 651323* - Nuclear Properties & Reactions, A=6-19, Experimental- Energy Levels & Transitions- (-1987); 640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources

Citation Formats

Robertson, R G.H., Warner, R A, and Austin, S M. Measurement of the internal pair emission branch of the 7. 654-MeV state of /sup 12/C, and the rate of the stellar triple-. cap alpha. reaction. United States: N. p., 1977. Web. doi:10.1103/PhysRevC.15.1072.
Robertson, R G.H., Warner, R A, & Austin, S M. Measurement of the internal pair emission branch of the 7. 654-MeV state of /sup 12/C, and the rate of the stellar triple-. cap alpha. reaction. United States. doi:10.1103/PhysRevC.15.1072.
Robertson, R G.H., Warner, R A, and Austin, S M. Tue . "Measurement of the internal pair emission branch of the 7. 654-MeV state of /sup 12/C, and the rate of the stellar triple-. cap alpha. reaction". United States. doi:10.1103/PhysRevC.15.1072.
@article{osti_7228632,
title = {Measurement of the internal pair emission branch of the 7. 654-MeV state of /sup 12/C, and the rate of the stellar triple-. cap alpha. reaction},
author = {Robertson, R G.H. and Warner, R A and Austin, S M},
abstractNote = {The internal pair decay of the 0/sup +/ 7.65-MeV state of /sup 12/C has been observed in coincidence with inelastic protons from /sup 12/C(p,p')/sup 12/C(7.65), using a plastic scintillator of essentially 4..pi.. sr solid angle. The branching ratio measured, GAMMA/sub ..pi..//GAMMA = (6.0 +- 1.1) x 10/sup -6/, is in excellent agreement with the previous measurement by Alburger, and reduces the uncertainty in the stellar triple-..cap alpha.. reaction rate by almost a factor of 2. Implications for the astrophysical production of /sup 12/C and /sup 16/O are discussed.},
doi = {10.1103/PhysRevC.15.1072},
journal = {Phys. Rev., C; (United States)},
number = ,
volume = 15:3,
place = {United States},
year = {1977},
month = {3}
}