Low energy upscattering of UCN in interaction with the surface of solid state

• Published in: Physics letters. A Vol. 367; no. 4; pp. 268 - 270
• Main Authors: Serebrov, A., Vassiljev, A., Lasakov, M., Krasnoschekova, I., Fomin, A., Geltenbort, P., Siber, E.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30-07-2007
• Subjects: Anomalous losses; Ultracold neutrons; 28.20.-v; Anomalous losses; Ultracold neutrons
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/j.physleta.2007.03.079

In connection with the problem of anomalous losses of ultracold neutrons (UCN) in the storage in the material traps the measurements of quasi-elastic scattering of UCN in collisions with trap surface coated with beryllium have been carried out. It was observed that the probability of quasi-elastic scattering of UCN from energy interval 0–77 neV to 90–200 neV is
(
2.2
±
0.2
)
×
10
−8
per collision therefore the process of quasi-elastic scattering cannot explain the effect of anomalous losses which is on the level
3
×
10
−5
.