First decay study of the new isotope 129Pm near the proton drip line
Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, PRC
2 Department of Technical Physics and MOE Key Laboratory, Peking University, 10087, Beijing, PRC
* e-mail: email@example.com
The very neutron-deficient nuclide 129Pm was produced via the 92Mo(40Ca, p2n) reaction and identified for the first time by using the X- coincidence in combination with a He jet tape transport system. According to the decay curve of a 99 keV -ray which corresponds to the known transition in the daughter nucleus 129Nd of the 129Pm decay, the half-life of 129Pm was determined to be 2.4(9) s. Based on the nuclear potential energy surface (PES) calculations, the ground-state spin-parity of 129Pm was predicted as 5/2- which is favorable to feed a 5/2- low-lying state in the daughter nucleus 129Nd via the (EC ) decay.
© Società Italiana di Fisica and Springer-Verlag, 2004