Issue |
EPJ Web Conf.
Volume 184, 2018
9th European Summer School on Experimental Nuclear Astrophysics
|
|
---|---|---|
Article Number | 01009 | |
Number of page(s) | 14 | |
Section | Session 1 | |
DOI | https://doi.org/10.1051/epjconf/201818401009 | |
Published online | 29 June 2018 |
https://doi.org/10.1051/epjconf/201818401009
Transfer reactions for nuclear astrophysics
Institut de Physique Nucléaire d’Orsay, UMR8608, IN2P3-CNRS, Université Paris sud 11,
91406 Orsay, France
* email: hammache@ipno.in2p3.fr
Published online: 29 June 2018
Direct measurements of cross sections at stellar energies are very challenging - if at all possible. This is essentially due to the very low cross-sections of the reactions of interest (especially when it involves charged particles), and/or to the radioactive nature of many key nuclei. Direct measurements with charged particles are often performed at higher energies and then extrapolated down to stellar energies using R-matrix calculations. However, these extrapolations are delicate because of the possible existence of unobserved low-energy or sub-threshold resonances. In order to bypass the difficulties related to direct measurements, indirect methods such as transfer reactions are used. These experiments are usually performed at higher energies and their conditions are relatively less stringent than in direct measurements. However, these methods rely on theoretical models for which the input parameters may be an important source of systematic uncer-tainties and thus need to be determined carefully. In this manuscript, a short overview on the difficulties related to direct measurements will be given as well as a description of thetransfer reaction method and the theoretical concept behind. Finally, the method will be illustrated through two recent performed studies.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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