The S{sub E1} factor of the {sup 12}C({alpha},{gamma}){sup 16}O Reaction and the {sup 16}N {beta}-delayed {alpha} Decay

Journal Article · Thu Jan 24 04:00:00 EST 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2870303· OSTI ID:21052863

Xiaodong, Tang ^[1]; Rehm, K E; Ahmad, I; Greene, J P; Hecht, A A; Henderson, D; Janssens, R V. F.; Jiang, C L; Kahl, D; Moore, E F; Notani, M; Pardo, R C; Patel, N; Savard, G; Schiffer, J P; Sinha, S; Shumard, B ^[2]; Brune, C R ^[3]; Champagne, A ^[4]; Jisonna, L ^[5]

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1. University of Notre Dame, Notre Dame, IN 46530 (United States)
2. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
3. Ohio University, Athens, Ohio 45701 (United States)
4. University of North Carolina, Chapel Hill, North Carolina 27599 (United States)
5. Northwestern University, Evanston, Illinois 60208 (United States)

The {sup 12}C({alpha},{gamma}){sup 16}O reaction is of great importance for the understanding the nuclear synthesis and explosion mechanism of the supernova. The cross section at the relevant stellar burning energies, around 300 keV, is dominated by the sub-threshold resonances. The {sup 16}N {beta}-delayed {alpha} decay data provide the most sensitive constrain on this sub-threshold resonance. Using twin-ionization chambers, we have measured the {alpha} particles and {sup 12}C recoil nuclei in coincidence. The spectrum has been fitted together with the published {sup 12}C({alpha},{gamma}){sup 16}O data and the elastic scattering phase shift data using R-matrix. The S{sub E1} factor at 300 keV has been determined as 73{+-}21 keVb.

• OSTI ID: 21052863
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 972; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY
ALPHA PARTICLES
ALPHA REACTIONS
CARBON 12 TARGET
CROSS SECTIONS
ELASTIC SCATTERING
ENERGY SPECTRA
IONIZATION CHAMBERS
KEV RANGE
NITROGEN 16
NUCLEOSYNTHESIS
OXYGEN 16
PHASE SHIFT
PHOTONS
R MATRIX
RECOILS
RESONANCE
STAR BURNING
SUPERNOVAE