Abstract
In my presentation, I will discuss the use of transfer reactions as an indirect method of determining information important for nuclear astrophysics. Specifically, I will focus on peripheral reactions and their analysis with the Asymptotic Normalization Coefficients (ANC) method. I will present results from related experiments that have been conducted at the Cyclotron Institute, Texas A&M University with focus on the 0ptical Model Parameters obtained and the need for reliable calculations. Additionally, I will describe the im- provements in the measured data that we obtained after upgrading the detection system used.
Highlights
The use of indirect methods (IM) in nuclear astrophysics is prompted by the known difficulties that one encounters in attempting to make direct nuclear astrophysics measurements
The Asymptotic Normalization Coefficients (ANC) method [3,4,5] is an indirect method introduced by the Nuclear Astrophysics group at Texas A&M-Cyclotron Institute (TAMU) roughly 2 decades ago to determine astrophysical S-factors for the non-resonant component of radiative proton capture at low energies by using one-proton transfer reactions involving complex nuclei at laboratory energies
Indirect methods are a valuable tool for nuclear astrophysics
Summary
The use of indirect methods (IM) in nuclear astrophysics is prompted by the known difficulties that one encounters in attempting to make direct nuclear astrophysics measurements. Some of them are so short-lived that even with the recent advances in the rare isotope production they are not available, or not available, for the exact projectile-target combination at the energies they have in stars. Another main source is the fact that reactions in stars occur at very small energies (10s-100s keV). Given that the Coulomb barrier is, in general, on the order of a few MeV, it leads to cross sections that are very small and as such, difficult to measure. IM are used to measure reactions at lab energies (1-10-100 MeV/nucleon) in order to evaluate cross-sections at stellar energies. The most used IM are: Coulomb dissociation, breakup, transfer reactions, the Trojan Horse Method and resonance spectroscopy
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