Mass Measurements With Sara

Direct mass measurements of A = 80 isobars were performed using the second cyclotron of SARA (Systeme Accelerateur Rhone-Alpes) of the ISN (Institut des Sciences Nucleaires) in Grenoble as a time-of-flight mass spectrometer. For Y-80 we found a mass value of 79.934320(180) u, corresponding to a decay energy Q (Y-80, Sr-80) of (9120 +/- 170) keV. Comparing this value to the former experiments of Lister et al. and Della Negra. et al. results in a difference of about 2.2 MeV. However, it does agree with the recommended value of Audi and Wapstra, which is derived from systematic trends.