nucl-ex digest · Nov 19, 2015

Pion photo- and electroproduction and the chiral MAID interface

We discuss the extended on-mass-shell scheme for manifestly Lorentz-invariant baryon chiral perturbation theory. We present a calculation of pion photo- and electroproduction up to and including order

q^{4}

. The low-energy constants have been fixed by fitting experimental data in all available reaction channels. Our results can be accessed via a web interface, the so-called chiral MAID (http://www.kph.uni-mainz.de/MAID/chiralmaid/). We explain how our program works and how it can be used for further analysis.

↳ hep-phnucl-exnucl-thPoS(2016)·0 citations

02*

Recent developments in the eikonal description of the breakup of exotic nuclei

P. Capel🇩🇪 · F. Colomer · H. Esbensen · T. Fukui🇯🇵 · R.C. Johnson · F.M. Nunes🇺🇸 · K. Ogata🇯🇵

The study of exotic nuclear structures, such as halo nuclei, is usually performed through nuclear reactions. An accurate reaction model coupled to a realistic description of the projectile is needed to correctly interpret experimental data. In this contribution, we briefly summarise the assumptions made within the modelling of reactions involving halo nuclei. We describe briefly the Continuum-Discretised Coupled Channel method (CDCC) and the Dynamical Eikonal Approximation (DEA) in particular and present a comparison between them for the breakup of 15C on Pb at 68AMeV. We show the problem faced by the models based on the eikonal approximation at low energy and detail a correction that enables their extension down to lower beam energies. A new reaction observable is also presented. It consists of the ratio between angular distributions for two different processes, such as elastic scattering and breakup. This ratio is completely independent of the reaction mechanism and hence is more sensitive to the projectile structure than usual reaction observables, which makes it a very powerful tool to study exotic structures far from stability.

↳ nucl-thnucl-exJ.Phys.Conf.Ser.(2016)·1 citation