Radiative alpha capture on 7-Be with DRAGON at energies relevant to the νp-process

2018-06-26T06:52:08Z (GMT) by Athanasios Psaltis Alan Chen
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 7Be(α,γ)11C reaction, which occurs prior to νp-process, can significantly influence the reaction flow, and subsequently the production of p-nuclei in the 907Be(α,γ)11C reaction with unknown strengths using DRAGON [3] was recently performed at TRIUMF. The reaction was studied in inverse kinematics using a radioactive 7Be (t1/2= 53.24 d) beam provided by ISAC-I and two resonances above the 11C 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).

Poster presented at the 15th International Symposium on Nuclei in the Cosmos (June 24-29, 2018 Assergi, L'Aquila, Italy)