Abstract
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.
Original language | English |
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Article number | 262502 |
Journal | Physical Review Letters |
Volume | 99 |
Issue number | 26 |
DOIs | |
State | Published - 27 Dec 2007 |
Externally published | Yes |