Comunicazione
Measurements of $^{20}Ne (p,\gamma)^{21}Na$ and $^{21}Ne (p,\gamma)^{22}Na$ reactions at LUNA experiment.
Casaburo F. per la LUNA Collaboration
Thanks to the natural shield against cosmic rays provided by the Gran Sasso massif, the LUNA accelerator facility made possible several precision measurements of nuclear reactions of astrophysical interest. In the last years, several key reactions of NeNa cycle, active in giant branch stars, novae and supernovae, have been studied. The $^{20}Ne (p,\gamma )^{21}Na$ is the slowest reaction in the cycle and directly affects the abundances on Ne and Na isotopes. LUNA studied the $E_r = 386$ keV resonance and the direct capture below $E_p = 370$ keV using a gas target setup and two high-purity germanium detectors. The same experimental setup is currently used for the study of the $^{21}Ne (p,\gamma )^{22}Na$ reaction which has a significant role in the $^{22}Na$ radioactive isotope in novae and supernovae. The experimental details, results on the $^{20}Ne (p,\gamma)^{21}Na$ current status of the $^{21}Ne (p,\gamma)^{22}Na$ experimental campaign, together with MC simulations, will be presented.