Abstract
A measurement of the 12 C( 14 N, α 20 Ne) 2 H and 12 C( 14 N,p 23 Na) 2 Hreactions has been performed at a 14 N beam energy of 30.0 MeV. The experiment aims to explore the extent to which contributing 24 Mg excited states can be populated in the quasi-free reaction off the deuteron in 14 N. In particular, the 24 Mg excitation region explored in the measurement plays a key role in stellar carbon burning whose cross section is commonly determined by extrapolating high-energy fusion data. From preliminary results, α and proton channels are clearly identified. In particular, ground and first excited states of 20 Ne and 23 Na play a major role.
Highlights
After more than four decades, carbon burning stands out as one of the most interesting subjects to study because of several reasons. 12C +12C is the system with more evidence for quasimolecular structure, derived mainly from excitation function measurements for many of the possible reaction channels [1,2,3,4,5,6,7]
There is a number of works providing evidence of direct 12C transfer in the 12C(14N,d)24Mg∗ reaction at 30 MeV of beam energy and up [24, 25]
The Trojan Horse Method (THM) [21,22,23] is a powerful indirect technique to determine the astrophysical factor for rearrangement reactions
Summary
After more than four decades, carbon burning stands out as one of the most interesting subjects to study because of several reasons. 12C +12C is the system with more evidence for quasimolecular structure, derived mainly from excitation function measurements for many of the possible reaction channels [1,2,3,4,5,6,7]. Considerable efforts have been devoted to measure the 12C + 12C cross section at astrophysical energies, involving both, charged particle [11,12,13] and gamma ray spectroscopy [14,15,16,17,18,19] It has only been previously measured down to Ecm = 2.5 MeV, still at the beginning of the region of astrophysical interest. In a more recent study [20], the astrophysical S(E) factor exhibits new resonances at Ecm ≤ 3.0 MeV, in particular, a strong resonance at Ecm = 2.14 MeV, which lies at the high-energy tail of the Gamow peak This resonance, if confirmed, would increase the present nonresonant reaction rate of the alpha channel by a factor of 5 near T = 0.8 GK. There is a number of works providing evidence of direct 12C transfer in the 12C(14N,d)24Mg∗ reaction at 30 MeV of beam energy and up [24, 25]
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