Abstract
A large number of uncertain resonances in the Gamow window make the 22Ne(p, γ)23Na reaction rate the most uncertain in the NeNa cycle. A new direct measurement of the 22Ne(p, γ)23Na reaction has been performed at LUNA (Laboratory for Underground Nuclear Astrophysics), with a windowless gas target. Two complementary setups have been used, to obtain both high resolution and high efficiency measurements. Three new resonances have been discovered at 156.2, 189.5 and 259.7 keV and their decay scheme has been determined. Two tentative resonances at 71 and 105 keV have not been detected and improved upper limits have been put on their strength. Thanks to the high-efficiency setup, it was possible to measure the non-resonant cross section at unprecedented low energies.
Highlights
A new direct measurement of the 22Ne(p, γ)23Na reaction has been performed at LUNA (Laboratory for Underground Nuclear Astrophysics), with a windowless gas target
In the innermost regions of asymptotic giant branch (AGB) stars, the temperature can be as high as 0.1 GK and the Hot Bottom Burning Process (HBB) takes place [1]
The non-resonant yield was measured at four beam energies, Ep = 188.0, 205.2, 250.0, and 310.0 keV to study the contribution by a broad sub-threshold resonance [23] and direct capture
Summary
- The status and future of direct nuclear reaction measurements for stellar burning M Aliotta, R Buompane, M Couder et al. - THE WEAK s-PROCESS IN MASSIVE STARS AND ITS DEPENDENCE ON THE NEUTRON CAPTURE CROSS SECTIONS M. - STARLIB: A NEXT-GENERATION REACTION-RATE LIBRARY FOR NUCLEAR ASTROPHYSICS A. E. Champange et al. Champange et al This content was downloaded from IP address 159.149.123.212 on 04/02/2022 at 10:46.
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