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HK: Fachverband Hadronen und Kerne

HK 50: Nuclear Astrophysics

HK 50.4: Vortrag

Mittwoch, 18. März 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 Yalcin^1,2, 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)