Understanding of ultra-cold-neutron production in solid deuterium

A. Frei; E. Gutsmiedl; C. Morkel; A. R. Müller; S. Paul; S. Rols; H. Schober; T. Unruh

doi:10.1209/0295-5075/92/62001

Understanding of ultra-cold-neutron production in solid deuterium

A. Frei, E. Gutsmiedl, C. Morkel, A. R. Müller, S. Paul, S. Rols, H. Schober, T. Unruh

Chair of Physics I

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Abstract

Our recent neutron scattering measurements of phonons and other quasi-particle excitations in solid deuterium (sD ₂) and the extraction of the density of states for phonons and rotational transitions in sD ₂ have led us to a new understanding of the production of ultra-cold neutrons (UCN) in sD ₂. The UCN production rate reaches a maximum at an equivalent neutron temperature of T _n=40 K for a neutron flux with Maxwellian energy distribution. The cross-section for UCN production in sD ₂ has been determined by using the density of states G ₁(E) in combination with the incoherent approximation as well as by a direct calibration of our measured neutron cross-sections with the known cross-section of the J=10 rotational transition in deuterium. Using this cross-section we deduced the production rate of UCN in sD ₂ which agrees quite well with direct measurements of this energy averaged UCN production cross-section.

Original language	English
Article number	62001
Journal	Europhysics Letters
Volume	92
Issue number	6
DOIs	https://doi.org/10.1209/0295-5075/92/62001
State	Published - Dec 2010

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title = "Understanding of ultra-cold-neutron production in solid deuterium",

abstract = "Our recent neutron scattering measurements of phonons and other quasi-particle excitations in solid deuterium (sD 2) and the extraction of the density of states for phonons and rotational transitions in sD 2 have led us to a new understanding of the production of ultra-cold neutrons (UCN) in sD 2. The UCN production rate reaches a maximum at an equivalent neutron temperature of T n=40 K for a neutron flux with Maxwellian energy distribution. The cross-section for UCN production in sD 2 has been determined by using the density of states G 1(E) in combination with the incoherent approximation as well as by a direct calibration of our measured neutron cross-sections with the known cross-section of the J=10 rotational transition in deuterium. Using this cross-section we deduced the production rate of UCN in sD 2 which agrees quite well with direct measurements of this energy averaged UCN production cross-section.",

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T1 - Understanding of ultra-cold-neutron production in solid deuterium

AU - Frei, A.

AU - Gutsmiedl, E.

AU - Morkel, C.

AU - Müller, A. R.

AU - Paul, S.

AU - Rols, S.

AU - Schober, H.

AU - Unruh, T.

PY - 2010/12

Y1 - 2010/12

N2 - Our recent neutron scattering measurements of phonons and other quasi-particle excitations in solid deuterium (sD 2) and the extraction of the density of states for phonons and rotational transitions in sD 2 have led us to a new understanding of the production of ultra-cold neutrons (UCN) in sD 2. The UCN production rate reaches a maximum at an equivalent neutron temperature of T n=40 K for a neutron flux with Maxwellian energy distribution. The cross-section for UCN production in sD 2 has been determined by using the density of states G 1(E) in combination with the incoherent approximation as well as by a direct calibration of our measured neutron cross-sections with the known cross-section of the J=10 rotational transition in deuterium. Using this cross-section we deduced the production rate of UCN in sD 2 which agrees quite well with direct measurements of this energy averaged UCN production cross-section.

AB - Our recent neutron scattering measurements of phonons and other quasi-particle excitations in solid deuterium (sD 2) and the extraction of the density of states for phonons and rotational transitions in sD 2 have led us to a new understanding of the production of ultra-cold neutrons (UCN) in sD 2. The UCN production rate reaches a maximum at an equivalent neutron temperature of T n=40 K for a neutron flux with Maxwellian energy distribution. The cross-section for UCN production in sD 2 has been determined by using the density of states G 1(E) in combination with the incoherent approximation as well as by a direct calibration of our measured neutron cross-sections with the known cross-section of the J=10 rotational transition in deuterium. Using this cross-section we deduced the production rate of UCN in sD 2 which agrees quite well with direct measurements of this energy averaged UCN production cross-section.

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Understanding of ultra-cold-neutron production in solid deuterium

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