Investigation on Periodic Oscillation in Orbital Electron Capture Decay in ^140Pr
Abstract
According to recent experimental data at GSI , periodic oscillation have been observed in orbital electron capture(EC) of Hydrogen-like ion ^140Pr^58+. They reported that this phenomenon can be explained by the neutrino mass difference . In order to test the existence of such a periodic oscillation in the decay of ^140Pr under the normal condition, we carried out an experiment to observe the EC decay of ^140Pr at the Van de Graaff accelerator facility in Osaka University. A 4.7-MeV proton beam was used to produce ^140Pr through the ^140Ce(p,n)^140Pr reaction. Observing K-X rays of Ce emitted just after the EC decay by using a Ge detector, a decay curve of ^140Pr was obtained. We could accumulate the time spectrum of the K-X rays with a good statistics under the low background condition. As a result, a finite-size component of the periodic oscillation could not be observed. We will discuss the experimental details and the result comparing with the GSI result.
- Publication:
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APS Meeting Abstracts
- Pub Date:
- October 2009
- Bibcode:
- 2009APS..HAW.GB064K