Experimental study of the α+ 64 Zn reaction in the Gamow region

Using our IFIN-HH facilities: the 3 MV TandetronTM accelerator and the ultra-low background laboratory we were able to study the 4He+64Zn reaction at energies under Coulomb barrier. With these facilities, cross sections of the order of 30 nb were obtained. The thick target yields were determined through measurements of γ-ray yield followed by the decay of 67Ga (T1/2=78.28 h) in two laboratories: microBequerel (the ultra-low background laboratory) and NAG (Nuclear Astrophysics Group) where the gamma rays were detected with HPGe detectors with a relative efficiency of 120% and 100% respectively. In addition, prompt in-beam gamma-rays were detected with an HPGe detector in close proximity as long as the reaction cross section was sufficiently large for those gammas to be extracted from the target hall background. Results of the experiment are shown below.