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Source enhancement measurement to determine. nu. sigma/sub f/ of uranium-238 for californium-252 spontaneous fission neutrons

B.W. Lee, S.H. Levine

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Abstract

The increase in intensity of a /sup 252/Cf neutron source surrounded by uranium depleted in the /sup 235/U isotope has been measured, and the results of this experiment were used to determine anti ..nu..sigma/sub f/ of /sup 238/U for /sup 252/Cf spontaneous-fission neutrons. The measurement was performed in the TRIGA Mark III reactor, using the multiplication property of a subcritical TRIGA core. A Monte Carlo calculation was performed, which employed ENDF/B-III data, to provide analytical results for comparison with the measurements. The source enehancement obtained using a depleted uranium cylinder surrounding the /sup 252/Cf source was measured to be (7.35 +- 0.20) percent compared with a calculated value of (7.11 +- 0.15) percent. The calculated results, using ENDF/B-III data, agree with the measurement within the uncertainty of the evaluated values of ..nu.. and sigma/sub f/.

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What this paper is about

The increase in intensity of a /sup 252/Cf neutron source surrounded by uranium depleted in the /sup 235/U isotope has been measured, and the results of this experiment were used to determine anti ..nu..sigma/sub f/ of /sup 238/U for /sup 252/Cf spontaneous-fission neutrons. The measurement was performed in the TRIGA Mark III reactor, using the multiplication property of a subcritical TRIGA core. A Monte Carlo calculation was performed, which employed ENDF/B-III data, to provide analytical results for comparison with the measurements. The source enehancement obtained using a depleted uranium cylinder surrounding the /sup 252/Cf source was measured to be (7.35 +- 0.20) percent compared with a calculated value of (7.11 +- 0.15) percent. The calculated results, using ENDF/B-III data, agree with the measurement within the uncertainty of the evaluated values of ..nu.. and sigma/sub f/.

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Available abstract

The increase in intensity of a /sup 252/Cf neutron source surrounded by uranium depleted in the /sup 235/U isotope has been measured, and the results of this experiment were used to determine anti ..nu..sigma/sub f/ of /sup 238/U for /sup 252/Cf spontaneous-fission neutrons. The measurement was performed in the TRIGA Mark III reactor, using the multiplication property of a subcritical TRIGA core. A Monte Carlo calculation was performed, which employed ENDF/B-III data, to provide analytical results for comparison with the measurements. The source enehancement obtained using a depleted uranium cylinder surrounding the /sup 252/Cf source was measured to be (7.35 +- 0.20) percent compared with a calculated value of (7.11 +- 0.15) percent. The calculated results, using ENDF/B-III data, agree with the measurement within the uncertainty of the evaluated values of ..nu.. and sigma/sub f/.

Key concepts: TRIGA, Californium, Physics, Nuclear physics, Fission, Uranium-238, Neutron, Isotopes of uranium

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