The beta-decay of "2"0Mg and its implications for the astrophysical rp-process

We have studied the #beta#-delayed proton and #gamma#-decay of "2"0Mg, produced by means of 95 MeV/u "2"4Mg+Ni reactions and implanted into a detector array after electromagnetic separation at GANIL. The experimental data obtained for excitation energies, #beta#-decay branching ratios, log-ft values and J"#pi#-assignments are given. No feeding has been observed to the 2646 keV state in "2"0Na, which plays an important role in the "1"9Ne(p, #gamma#)"2"0Na breakout reaction from the hot CNO cycle. A large difference of log ft values for mirror states in "2"0Na and "2"0F was found. The experimentally determined level properties, including B(GT) values, are discussed with reference to model calculations performed within the complete sd-shell space. (orig.)Available from TIB Hannover: RO 801(93-47) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman