Speaker
Athanasios Psaltis
(McMaster University)
Description
The origin of about 35 neutron-deficient stable isotopes with mass number A 74, known as the p-nuclei, has been a long-standing puzzle in nuclear astrophysics. The νp-process is a candidate for the production of the light p-nuclei, but it presents high sensitivity to both supernova dynamics and nuclear physics [1,2]. It has been recently shown that the breakout from pp-chains through the 7-Be(α,γ)11-C reaction, which occurs prior to νp-process, can significantly influence the reaction flow, and subsequently the production of p-nuclei in the 90 A 110 region [2]. Nevertheless, this reaction has not been studied well yet in the relevant temperature range - T= 1.5-3 GK. To that end, the first direct study of important resonances of the 7-Be(α,γ)11-C reaction with unknown strengths using DRAGON [3] was recently performed at TRIUMF. The reaction was studied in inverse kinematics using a radioactive 7-Be (t1/2= 53.24 d) beam provided by ISAC-I and two resonances above the 11-C α-separation energy - Qα = 7543.62 keV - were measured. The experimental details, in particular how the recoil transmission and BGO efficiencies were accounted for considering the large cone angle for this reaction, will be presented and discussed alongside some preliminary results.
References
[1] C. Frohlich et al., Phys. Rev. Lett. 96, 142502 (2006).
[2] S. Wanajo, H.-T. Janka and S. Kubono, Astrophys. J. 729, 46 (2011).
[3] D.A. Hutcheon et al., Nucl. Instr. Meth. Phys. Res. A 498, 190 (2003).
Primary authors
Alan Chen
(McMaster University)
Athanasios Psaltis
(McMaster University)
Co-authors
Mr
Alex Wen
(University of British Columbia)
Dr
Annika Lennarz
(TRIUMF)
Prof.
Barry Davids
(TRIUMF)
Dr
Chris Ruiz
(TRIUMF)
Dr
D. A. Hutcheon
(TRIUMF)
Dr
Devin Connolly
(TRIUMF)
Mr
Gaurav Tenkila
(University of British Columbia)
Ms
Gwenaelle Gilardy
(University of Notre Dame)
Mr
Johnson Liang
(McMaster University)
Mr
Jonathan Karpesky
(Colorado School of Mines)
Mr
Matthew Lovely
(Colorado School of Mines)
Mr
Matthew Williams
(University of York / TRIUMF)
Dr
Nicholas Esker
(TRIUMF)
Mr
Rekam Giri
(Ohio University)
Mr
Som Nath Paneru
(Ohio University)
Prof.
Uwe Greife
(Colorado School of Mines)
Mr
William Huang
(University of British Columbia)
