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HK: Fachverband Hadronen und Kerne
HK 50: Nuclear Astrophysics
HK 50.4: Talk
Wednesday, March 18, 2009, 15:00–15:15, H-ZO 60
Temperature dependence of β− and β+ / ε decay branching ratio of embedded 74As — •Janos Farkas1, Gyorgy Gyurky1, Caner Yalcin1,2, Zoltan Elekes1, Gabor G. Kiss1, Zsolt Fulop1, Endre Somorjai1, Kalman Vad1, Jozsef Hakl1, and Sandor Meszaros1 — 1Institute of Nuclear Research (ATOMKI), H-4001 Debrecen, POB. 51, Hungary — 2Kocaeli University, Dept. of Physics, TR-41380 Umuttepe, Kocaeli, Turkey
The branching ratio between the β− and β+ / ε decays of 74As has been measured recently in different environments at room temperature [1]. We extended the measurement to the temperature range of 250 mK – 300 K using Ge and Ta host materials. The performed experiment represents the first decay branching ratio measurement down to the millikelvin range. No significant dependence on the temperature or on the host materials has been found.
[1] Gy. Gyürky et al., Europhys. Lett. 83, 42001 (2008)