2{sup +} excitation of the {sup 12}C Hoyle state

Journal Article · Thu Oct 15 00:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.041303· OSTI ID:21293903

Freer, M ^[1]; Fujita, H; Carter, J; Usman, I ^[2]; Buthelezi, Z; Foertsch, S V; Neveling, R; Perez, S M; Smit, F D ^[3]; Fearick, R W ^[4]; Papka, P; Swartz, J A ^[5]

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1. School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT (United Kingdom)
2. School of Physics, University of the Witwatersrand, Johannesburg 2050 (South Africa)
3. iThemba LABS, P.O. Box 722, Somerset West 7129 (South Africa)
4. Physics Department, University of Cape Town, Private Bag, Rondebosch 7700 (South Africa)
5. Physics Department, University of Stellenbosch, Private Bag X1, Matieland 7602, Stellenbosch (South Africa)

A high-energy-resolution magnetic spectrometer has been used to measure the {sup 12}C excitation energy spectrum to search for the 2{sup +} excitation of the 7.65 MeV, 0{sup +} Hoyle state. By measuring in the diffractive minimum of the angular distribution for the broad 0{sup +} background, evidence is found for a possible 2{sup +} state at 9.6(1) MeV with a width of 600(100) keV. The implications for the {sup 8}Be+{sup 4}He reaction rate in stellar environments are discussed.

• OSTI ID: 21293903
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 80, Issue 4; Other Information: DOI: 10.1103/PhysRevC.80.041303; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BERYLLIUM 8
CARBON 12
ENERGY RESOLUTION
ENERGY SPECTRA
EXCITATION
HELIUM 4
MAGNETIC SPECTROMETERS
MEV RANGE 01-10
REACTION KINETICS