Super allowance beta decay of 62Ga

Super allowance β transition from 62Ga was investigated. The β source of 62Ga was produced from zinc with a synchrotron at INS. A rotating cylinder with a shutter was used as an experimental apparatus. A plastic scintillation counter was a detector for β ray. Energy-time spectra were obtained with a 4096 channel P.H.A. In the time spectra, decay products of 12B, 12N, long lived β activity and the β ray from 62Ga with half-life of 117.7 +- 2.8 m sec were observed. The maximum energy of the β ray from 62Ga was 7.8 +- 0.7 MeV. Gamma-ray in 62Zn could not be observed. Coulomb displacement energy (ΔEc) in same isobaric analog states (IAS) has been precisely investigated. The maximum energy from ΔEc was 8156 +- 10 KeV. The ft value obtained from the half-life corrected for branching ratio and the maximum energy was 3150 +- 90 sec. The measurement of ft value will give information concerning nuclear structure. Due to experimental accuracy, the present result was not able to show the effect of nuclear structure. More precise measurement is planned and in preparation. (Kato, T.)