β Scribed by C.A. Mallmann
No coin nor oath required. For personal study only.
The analysis of the coincidence method using a coincidence beta spectrometer shows us that this instrument must fulfil the following conditions: 1) Independent energy measurement in the counterspectrometer systems. 2) Big gathering power and good resolving power in the counter-spectrometer systems. 3) Posibility of reducing to a negligeable value with absorbing materials, the counts produced by gamma rays. 4) Optimum location of the counters to make the cosmic-rays coincidence counts negligeable. 5) Counter outside of the magnetic field.
An instrument which fulfils these conditions is that developed by O. Kofoed-Hansen, J. LindhardandO. B. Nielsen 1) adapted as a double coincidence spectrometer, as results from the following considerations.
If the magnetic field of this instrument is refered to a cylindrical coordinate system (z, r, 9
π SIMILAR VOLUMES
## Synopsis A semi-circular beta-ray spectrometer for coincidence measurements and the associated homogeneous magnet are described. Some operating data are given including t h a t relevant to the measurement of branching ratios. \*) Now at the Natuurkundig Laboratorium der N.V. Philips' Gloeilamp