Session M15: Nuclear Astrophysics II
3:15 PM–4:39 PM, Sunday, April 15, 2007
Hyatt Regency Jacksonville Riverfront Room: City Terrace 11
Sponsoring Unit:
DNP
Chair: Bob Tribble, Texas A&M University
Abstract ID: BAPS.2007.APR.M15.6
Abstract: M15.00006 : First Measurement of the Cascade Transition via the 6.049-MeV State of $^{16}$O in the $^{12}$C($\alpha,\gamma$)$^{16}$O Reaction
4:15 PM–4:27 PM
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Abstract 
Authors:
Catalin Matei
(Ohio University)
C.R. Brune
(Ohio University)
L. Buchmann
(TRIUMF)
D.A. Hutcheon
(TRIUMF)
C. Ruiz
(TRIUMF)
J. Caggiano
(TRIUMF)
A. Laird
(TRIUMF)
Z.H. Li
(TRIUMF)
A. Olin
(TRIUMF)
D. Ottewell
(TRIUMF)
G. Ruprecht
(TRIUMF)
M. Trinczek
(TRIUMF)
C. Vockenhuber
(TRIUMF)
J. D'Auria
(Simon Fraser U.)
M. Lamey
(Simon Fraser U.)
C. Wrede
(Simon Fraser U.)
A.A. Chen
(McMaster U.)
J. Pearson
(McMaster U.)
W.R. Hannes
(U. of Kostanz)
The cascade through the 6.049-MeV state of $^{16}$O has rarely been discussed as contributing to the $^{12}$C ($\alpha$,$\gamma$)$^{16}$O cross section at low energies largely due to experimental difficulties in observing this transition. We report here first measurements of this transition in $^{12}$C($\alpha$,$\gamma$)$^{16}$O using the DRAGON separator facility at TRIUMF. The experiment was performed in inverse kinematics with an incident $^{12}$C beam on a windowless $^{4}$He gas target. The coincidence setup included a BGO array around the gas target and a DSSSD detector for the detection of $^{16}$O recoils. The acceptance of DRAGON including the BGO array has been simulated in GEANT as well as measured directly. The transition strength has been derived and analyzed in the R- matrix formalism. We find an extrapolated value of $S_{6.05} (300)=25\pm16$ keVb showing that this transition is likely the most important cascade contribution for $^{12}$C ($\alpha$,$\gamma$)$^{16}$O.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.APR.M15.6