Abstract
A beta spectrometer consisting of an angle- and energy-focusing magnetic sector field and a Ge(HP)-detector has been constructed for the measurement of beta endpoint energies and for β—γ-angular correlation studies. The system has an effective acceptance solid angle of 0.4% of 4π and an energy transmission of approximately ±5% around a chosen mean energy. First measurements were performed at the on-line mass separator OSTIS at the ILL. The cutoff of low energy electrons enabled rapid data accumulation since the full intensity of the mass separator could be used and pile-up problems were avoided. Better γ-shielding, because of magnetic focusing of the beta particles, significantly reduced the background in the beta spectra relative to previous measurements at OSTIS. The apparatus has also been used to refine the response function of our Ge(HP)-detector.
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