Cold neutron energy dependent production of ultracold neutrons in solid deuterium

• Published in: Physical review letters Vol. 99; no. 26; p. 262502
• Main Authors: Atchison, F, Blau, B, Bodek, K, van den Brandt, B, Bryś, T, Daum, M, Fierlinger, P, Frei, A, Geltenbort, P, Hautle, P, Henneck, R, Heule, S, Holley, A, Kasprzak, M, Kirch, K, Knecht, A, Konter, J A, Kuźniak, M, Liu, C-Y, Morris, C L, Pichlmaier, A, Plonka, C, Pokotilovski, Y, Saunders, A, Shin, Y, Tortorella, D, Wohlmuther, M, Young, A R, Zejma, J, Zsigmond, G
• Format: Journal Article
• Language: English
• Published: United States 31.12.2007
• ISSN: 0031-9007
• DOI: 10.1103/PhysRevLett.99.262502

A measurement of the production of ultracold neutrons from velocity-selected cold neutrons on gaseous and solid deuterium targets is reported. The expected energy dependence for two-particle collisions with well defined neutron and Maxwell-Boltzmann distributed molecular velocities is found for the gas target. The solid target data agree in shape with the phonon density-of-states curve and provide strong evidence for the phonon model including multiphonon excitations.