β -decay studies of states in 12 C

C nucleus is partly due to the astrophysical interest inits spectroscopic properties, which determine the triple alpha reaction rate, and partly motivatedby the structure of this nucleus, which is not fully explained theoretically. Some aspects aredescribed in the shell model and others by a cluster structure of three alpha particles, but bothcannot so far be combined in a unified model. New experiments h ave been performed to addressthese problems. The focus of this work is on an implantation experiment, which took place inApril 2006 at KVI.International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IXJune 25-30 2006CERN, Geneva, Switzerland