Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The scattering of slow neutron beams provides unique, non-destructive, quantitative information on the structure and dynamics of materials of interest in physics, chemistry, materials science, biology, geology, and other fields. Liquid hydrogen is a widely-used neutron moderator medium, and an accurate knowledge of its slow neutron cross section is essential for the design and optimization of intense slow neutron sources. In particular the rapid drop of the slow neutron scattering cross section of liquid parahydrogen below 15 meV, which renders the moderator volume transparent to the neutron energies of most interest for scattering studies, is therefore especially interesting and important. We have placed an upper bound on the total cross section and the scattering cross section for slow neutrons with energies between 0.43 meV and 16.1 meV on liquid hydrogen at 15.6 K using neutron transmission measurements on the hydrogen target of the NPDGamma collaboration at the Spallation Neutron Source at Oak Ridge National Laboratory. At 1 meV this new upper bound is a factor of 3 below the data from previous work which has been used in the design of liquid hydrogen moderators at slow neutron sources. We describe our measurements, compare them with previous work, and discuss the implications for designing more intense slow neutron sources.
Measurement of the Scattering Cross Section of Slow Neutrons on Liquid Parahydrogen from Neutron Transmission
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The scattering of slow neutron beams provides unique, non-destructive, quantitative information on the structure and dynamics of materials of interest in physics, chemistry, materials science, biology, geology, and other fields. Liquid hydrogen is a widely-used neutron moderator medium, and an accurate knowledge of its slow neutron cross section is essential for the design and optimization of intense slow neutron sources. In particular the rapid drop of the slow neutron scattering cross section of liquid parahydrogen below 15 meV, which renders the moderator volume transparent to the neutron energies of most interest for scattering studies, is therefore especially interesting and important. We have placed an upper bound on the total cross section and the scattering cross section for slow neutrons with energies between 0.43 meV and 16.1 meV on liquid hydrogen at 15.6 K using neutron transmission measurements on the hydrogen target of the NPDGamma collaboration at the Spallation Neutron Source at Oak Ridge National Laboratory. At 1 meV this new upper bound is a factor of 3 below the data from previous work which has been used in the design of liquid hydrogen moderators at slow neutron sources. We describe our measurements, compare them with previous work, and discuss the implications for designing more intense slow neutron sources.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The scattering of slow neutron beams provides unique, non-destructive, quantitative information on the structure and dynamics of materials of interest in physics, chemistry, materials science, biology, geology, and other fields. Liquid hydrogen is a widely-used neutron moderator medium, and an accurate knowledge of its slow neutron cross section is essential for the design and optimization of intense slow neutron sources. In particular the rapid drop of the slow neutron scattering cross section of liquid parahydrogen below 15 meV, which renders the moderator volume transparent to the neutron energies of most interest for scattering studies, is therefore especially interesting and important. We have placed an upper bound on the total cross section and the scattering cross section for slow neutrons with energies between 0.43 meV and 16.1 meV on liquid hydrogen at 15.6 K using neutron transmission measurements on the hydrogen target of the NPDGamma collaboration at the Spallation Neutron Source at Oak Ridge National Laboratory. At 1 meV this new upper bound is a factor of 3 below the data from previous work which has been used in the design of liquid hydrogen moderators at slow neutron sources. We describe our measurements, compare them with previous work, and discuss the implications for designing more intense slow neutron sources.
The Scattering of Slow Neutrons by Ortho and Parahydrogen
Author:
Publisher:
ISBN:
Category : Hydrogen ions
Languages : en
Pages : 36
Book Description
Publisher:
ISBN:
Category : Hydrogen ions
Languages : en
Pages : 36
Book Description
Spin Dependence of Slow Neutron Scattering by Deuterons
Author: Enrico Fermi
Publisher:
ISBN:
Category : Deuterons
Languages : en
Pages : 10
Book Description
Publisher:
ISBN:
Category : Deuterons
Languages : en
Pages : 10
Book Description
A Precise Determination of the Slow Neutron Cross Section of the Free Proton
Author: Edward Melkonian
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 32
Book Description
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 32
Book Description
Thermal Neutron Scattering
Author: Peter A. Egelstaff
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 548
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 548
Book Description
Measurement of the Neutron-proton Cross Section at 1.0 Mev and 2.5 Mev
Author: Reuben Elbert Fields
Publisher:
ISBN:
Category : Neutron-proton interactions
Languages : en
Pages : 220
Book Description
Publisher:
ISBN:
Category : Neutron-proton interactions
Languages : en
Pages : 220
Book Description
Elastic and Inelastic Scattering of 90-Mev Neutrons by Deuterons
Author: Byron L. Youtz
Publisher:
ISBN:
Category : Collisions (Nuclear physics)
Languages : en
Pages : 68
Book Description
Publisher:
ISBN:
Category : Collisions (Nuclear physics)
Languages : en
Pages : 68
Book Description
The Total Cross Section of Slow Neutrons on Parahydrogen and Orthodeuterium
Author: Joseph Anthony Callerame
Publisher:
ISBN:
Category :
Languages : en
Pages : 136
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 136
Book Description
The Scattering of Slow Neutrons by Hydrogenous Moderators
Author: T. J. Krieger
Publisher:
ISBN:
Category : Hydrogen
Languages : en
Pages : 44
Book Description
Publisher:
ISBN:
Category : Hydrogen
Languages : en
Pages : 44
Book Description
Elements of Slow-Neutron Scattering
Author: J. M. Carpenter
Publisher: Cambridge University Press
ISBN: 0521857813
Category : Science
Languages : en
Pages : 539
Book Description
This book provides a comprehensive and up-to-date introduction to the fundamental theory and applications of slow-neutron scattering.
Publisher: Cambridge University Press
ISBN: 0521857813
Category : Science
Languages : en
Pages : 539
Book Description
This book provides a comprehensive and up-to-date introduction to the fundamental theory and applications of slow-neutron scattering.