Preparation and properties of a reproducible neutron standard

doi:10.1098/rspa.1949.0037

Cited by 8 publications

(1 citation statement)

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“…Littler (1952), however, has employed a sub critical pile to obtain (1'65±0'I)xl0-2 neutronssec-1 g-1 uranium. In the present experiment an accurate comparison was made of the number of neutrons mnitted from a block of uranium of known size with a RaBeF4 neutron source, recently calibrated by Bretscher et al (1949) and Edge (1956).…”

Section: Experimental Results (A) the Neutron Yield From The Spomentioning

confidence: 99%

Neutron Experiments with a Sensitive Szilard?Chalmers Detector

Edge¹

1956

Aust. J. Phys.

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SummaryThe Szilard-Chalmers reaction has been developed as a sensitive detector for the comparison of neutrons from sources of different primary energy and angular distribution. Using sodium permanganate solution, a detection efficiency of approximately 7 per cent. for all neutrons in the energy range 0--5 MeV was obtained and high accuracy achieved.The method of detection was employed to make the following measurements: {i) The neutron yield from the spontaneous fission of natural uranium was found to be (I· 56±0·12) X 10-2neutrons sec-1 g-l.(ii) The cross section for the reaction 6Li(y, n) at 6·2 MeV was found to be (3±2) X 10-28 cm 2 . (iii) The cross section for the reaction "Be(n, 2n) induced by Ra-Be and Po-Be sources of neutrons was found to be (0·37±0·06) X 10-2 • cm 2 . (iv) A limit was placed on the cross-over transition from the 2·5 MeV state to the ground state in 60CO. The transition probability was found to be less than 1 X 10-6 of that for the cascade consisting of the two y-rays.

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Section: Experimental Results (A) the Neutron Yield From The Spomentioning

confidence: 99%