UV Spectrum and Proposed Role of Diethylberyllium in a 7Li-7Be Solar Neutrino Experiment

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Science  08 May 1992:
Vol. 256, Issue 5058, pp. 820-822
DOI: 10.1126/science.256.5058.820


Although measurement of the solar neutrino flux via the 7Li(ve,eā€“)7Be reaction was proposed many years ago, no experiment has been implemented since it has been difficult to identify a sensitive 7Be detection technique. Here it is proposed that the 7Be atom be incorporated into a volatile molecule, placed in a buffer-gas-filled cell, and then extracted by photodissociation; after excitation by a tunable laser, bursts of photons would be detected. The absorption spectrum of the molecular candidate diethylberyllium has been measured between 186 and 270 nanometers in a spectrophotometer to determine the required photodissociation laser wavelength and intensity.