Volume 103, Number 1, July 2013
|Number of page(s)||5|
|Published online||08 July 2013|
Investigating solid α-15N2 as a new source of ultra-cold neutrons
1 Physics Department and Center for Exploration of Energy and Matter, Indiana University Bloomington, IN 47405, USA
2 Physik-Department, Technische Universität Munchen - James-Franck-Str., D-85747 Garching, Germany, EU
3 Institut Laue Langevin - 6 Rue Jules Horowitz, F-38042 Grenoble CEDEX9, France, EU
4 Dipartimento di Fisica, Università di Perugia - I-06123 Perugia, Italy, EU
Received: 15 May 2013
Accepted: 14 June 2013
The dynamical structure factor of solid 15N2 in the α phase () is measured at the IN4 time-of-flight spectrometer at the Institut Laue Langevin, and the potential performance of this substance as a UCN converter is assessed. The cross-section to down-scatter neutrons to ultra-cold–neutron energies is determined as a function of the incident energy, as well as the up-scattering mean free path. The UCN production cross-section is found to be approximately of that of deuterium. However, UCN with energy 181 neV have an up-scattering mean free path of 46 cm at , which is times larger than deuterium. Therefore, a large volume α-15N2 source may produce an improved UCN density if sufficient isotopic purity can be achieved.
PACS: 29.25.Dz – Neutron sources / 61.05.fg – Neutron scattering (including small-angle scattering) / 63.20.-e – Phonons in crystal lattices
© EPLA, 2013
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