Speaker
Christian Diget
(University of York)
Description
We here present some of the first direct-reaction data with radioactive ion beams utilising the TIGRESS and SHARC particle-gamma detector systems. In the experiment, transfer reactions in inverse kinematics were used as indirect probes of the 18Ne(alpha,p)21Na and 23Mg(p,gamma)24Al reactions. The SHARC array (Silicon Highly-segmented Array for Reactions and Coulex) is a new multi-purpose device for charged-particle detection. The array is utilised particularly for direct-reaction studies with radioactive-ion beams at the ISAC-II accelerator facility at TRIUMF, Canada [1] in conjunction with the TIGRESS gamma-ray spectrometer [2]. In the present experiment, the properties of states in 22Mg that mediate the 18Ne(alpha,p)21Na Hot-CNO-breakout reaction are studied, with particular emphasis on proton decay to the excited states of 21Na. The states are probed through deuteron transfer from 6Li onto 20Na, identified from the residual alpha particle in the transfer. The 21Na+p decay channel is identified from the emitted proton, for 21Na excited states measured in coincidence with the emitted de-excitation gamma rays. The presentation will describe first results from the experiment, with an outlook towards the wider applicability of direct reactions as indirect probes of astrophysical reaction rates, measured through combined charged-particle and gamma-ray spectroscopy. [1] R. E. Laxdal, Nucl. Inst. Meth. B 204, 400 (2003). [2] C. E. Svensson, et al., J. Phys. G 31, S1663 (2005).
Primary author
Christian Diget
(University of York)
Co-authors
A Garnsworthy
(TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada)
B R Fulton
(Department of Physics, University of York, York, YO10 5DD, U.K.)
C E Svensson
(Department of Physics, University of Guelph, Guelph, ON, N1G 2W1, Canada)
C J Pearson
(TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada)
D Cross
(Department of Chemistry, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada)
D Smalley
(Department of Physics, Colorado School of Mines, Golden, CO 80401, U.S.A.)
E Tardiff
(TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada)
F Sarazin
(Department of Physics, Colorado School of Mines, Golden, CO 80401, U.S.A.)
G C Ball
(TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada)
G Hackman
(TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada)
G L Wilson
(Department of Physics, University of Surrey, Guildford, GU2 5XH, U.K.)
J C Blackmon
(Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, U.S.A.)
J R Brown
(Department of Physics, University of York, York, YO10 5DD, U.K.)
L Achouri
(Laboratoire de Physique Corpusculaire, IN2P3-CNRS, ISMRA et Université de Caen, F-14050 Caen, France)
L Linhardt
(Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, U.S.A.)
M Matos
(Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, U.S.A.)
M Pearson
(TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada)
N A Orr
(Laboratoire de Physique Corpusculaire, IN2P3-CNRS, ISMRA et Université de Caen, F-14050 Caen, France)
P Adsley
(Department of Physics, University of York, York, YO10 5DD, U.K.)
R M Churchman
(TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada)
S P Fox
(Department of Physics, University of York, York, YO10 5DD, U.K.)
S Williams
(TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada)
U Hager
(Department of Physics, Colorado School of Mines, Golden, CO 80401, U.S.A.)
W N Catford
(Department of Physics, University of Surrey, Guildford, GU2 5XH, U.K.)
