TY  - JOUR
AU  - n_TOF Collaboration (Massimi, C. et al
AU  - Domingo-Pardo, C.
AU  - Giubrone, G.
AU  - Tain, J. L.
PY  - 2017
DA  - 2017//
TI  - Neutron spectroscopy of Mg-26 states: Constraining the stellar neutron source Ne-22(alpha, n)Mg-25
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 1
EP  - 6
VL  - 768
PB  - Elsevier Science Bv
KW  - s Process
KW  - alpha+Ne-22
KW  - Neutron spectroscopy
AB  - This work reports on accurate, high-resolution measurements of the Mg-25(n, gamma)Mg-26 and Mg-25(n, tot) cross sections in the neutron energy range from thermal to about 300 keV, leading to a significantly improved Mg-25(n, gamma)Mg-26 parametrization. The relevant resonances for n+Mg-25 were characterized from a combined R-matrix analysis of the experimental data. This resulted in an unambiguous spin/parity assignment of the corresponding excited states in Mg-26. With this information experimental upper limits of the reaction rates for Ne-22(alpha, n)Mg-25 and Ne-22(alpha, gamma)Mg-26 were established, potentially leading to a significantly higher (alpha, n)/(alpha, gamma) ratio than previously evaluated. The impact of these results has been studied for stellar models in the mass range 2 to 25 M-circle dot. (C) 2017 The Author(s). Published by Elsevier B.V.
SN  - 0370-2693
UR  - http://arxiv.org/abs/1702.04520
UR  - https://doi.org/10.1016/j.physletb.2017.02.025
DO  - 10.1016/j.physletb.2017.02.025
LA  - English
N1  - WOS:000400677700001
ID  - n_TOFCollaborationMassimi_etal2017
ER  -