A controlled and precise determination of the cross sections of the fusion reactions Be7(p,I )B8 and He3(He4,I )Be7, which play an important role in determining the solar neutrino flux, necessitates the knowledge of a precise value of the electron-capture half-life of Be7. This half-life may depend on the material hosting the Be7 atoms via small modifications of the electron density around the Be7 nucleus. In this brief communication we report on the measurement of Be7 implanted in four materials: copper, aluminum, sapphire, and PVC. The four results are consistent with a null host dependence within two standard deviations and their weighted average of 53.236(39) d agrees very well with the adopted value in the literature, 53.22(6) d. The present results may exhibit a slight (0.22%) increase of the half-life at room temperature for metals compared to insulators that requires further studies.
ASJC Scopus subject areas
- Nuclear and High Energy Physics