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Modeling fast neutron shielding for the direct nn-scattering experiment

Publication ,  Journal Article
Gueorguiev, GP; Howell, CR; Mitchell, GE; Sharapov, EI; Tornow, W
Published in: International Meeting on Nuclear Applications of Accelerator Technology: Accelerator Application in a Nuclear Renaissance
January 1, 2003

Modern high power accelerators and reactors provide the possibility of a direct measurement of neutron-neutron scattering. This experiment addresses the fundamental problem of charge symmetry in the nuclear force by comparing the proton-proton, pp, and neutron-neutron, nn, scattering lengths. The high flux pulsed reactor YAGUAR will be used to perform the experiment, with a neutron detector placed in an evacuated underground channel. Of paramount importance is the detector background. Here we address the fission neutron background component due to the delayed neutrons multiplied in the subcritical reactor. The Monte Carlo MCNP4-C code with the weight window variance reduction technique was chosen to calculate the neutron transport for a 6-m model of the shield consisting of water, concrete, and earth, with a 7-cm diameter channel lined with boron carbide. The present calculations are important for refining the background calculations for the real nn-experiment. These results can also be extended to design studies of biological shields at accelerators.

Duke Scholars

Published In

International Meeting on Nuclear Applications of Accelerator Technology: Accelerator Application in a Nuclear Renaissance

Publication Date

January 1, 2003

Start / End Page

53 / 58
 

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Gueorguiev, G. P., Howell, C. R., Mitchell, G. E., Sharapov, E. I., & Tornow, W. (2003). Modeling fast neutron shielding for the direct nn-scattering experiment. International Meeting on Nuclear Applications of Accelerator Technology: Accelerator Application in a Nuclear Renaissance, 53–58.
Gueorguiev, G. P., C. R. Howell, G. E. Mitchell, E. I. Sharapov, and W. Tornow. “Modeling fast neutron shielding for the direct nn-scattering experiment.” International Meeting on Nuclear Applications of Accelerator Technology: Accelerator Application in a Nuclear Renaissance, January 1, 2003, 53–58.
Gueorguiev GP, Howell CR, Mitchell GE, Sharapov EI, Tornow W. Modeling fast neutron shielding for the direct nn-scattering experiment. International Meeting on Nuclear Applications of Accelerator Technology: Accelerator Application in a Nuclear Renaissance. 2003 Jan 1;53–8.
Gueorguiev, G. P., et al. “Modeling fast neutron shielding for the direct nn-scattering experiment.” International Meeting on Nuclear Applications of Accelerator Technology: Accelerator Application in a Nuclear Renaissance, Jan. 2003, pp. 53–58.
Gueorguiev GP, Howell CR, Mitchell GE, Sharapov EI, Tornow W. Modeling fast neutron shielding for the direct nn-scattering experiment. International Meeting on Nuclear Applications of Accelerator Technology: Accelerator Application in a Nuclear Renaissance. 2003 Jan 1;53–58.

Published In

International Meeting on Nuclear Applications of Accelerator Technology: Accelerator Application in a Nuclear Renaissance

Publication Date

January 1, 2003

Start / End Page

53 / 58