Ultracold Neutron (UCN) quantum states & Position-sensitive measurements

Modeling of ultracold neutron motion within the UCN $\tau$ magneto-gravitational trapModeling of ultracold neutron motion within the UCN$\tau$ magneto-gravitational trap

Douglas Wong

Bulletin of the American Physical SocietyOct 29, 20150 citations

A new escape channel for ultracold neutrons in traps

Peter W. Geltenbort, Валерий Викторович Несвижевский, D. G. Kartashov +9 more

A surprising new escape channel for ultracold neutrons (UCNs) in traps was reported recently. It could be relevant to the long-standing puzzle of the “too high” loss rate of UCNs from traps, which has yet to be completely understood and eliminated. In the present work we positively identify the new phenomenon and investigate it in detail. The escape of UCNs from traps is due to rare events in which their energy undergoes a small increase (∼10 −7 eV). The reason for such an energy gain and its impact on the physics of UCN storage is still to be investigated.A surprising new escape channel for ultracold neutrons (UCNs) in traps was reported recently. It could be relevant to the long-standing puzzle of the “too high” loss rate of UCNs from traps, which has yet to be completely understood and eliminated. In the present work we positively identify the new phenomenon and investigate it in detail. The escape of UCNs from traps is due to rare events in which their energy undergoes a small increase (∼10 −7 eV). The reason for such an energy gain and its impact on the physics of UCN storage is still to be investigated.

Journal of Experimental and Theoretical Physics LettersAug 1, 19999 citations

Ultracold neutrons

M. Asghar

NatureMar 1, 19780 citations

Quantum Mechanics of Ultracold Neutrons

V. K. Ignatovich

Springer eBooksJan 1, 19941 citation

First ever storage of ultracold neutrons in a magnetic trap made of permanent magnets

В. Ф. Ежов, A. Z. Andreev, A.A. Glushkov +13 more

Further improvement in the accuracy of any neutron lifetime experiment by means of ultracold neutrons (UCN) in material bottles is limited due to unavoidable systematic effects when the UCN are reflected from the walls. However, such effects can be excluded in principle if magnetic trapping of UCN is used. The storage of UCN in a small magnetic trap made of permanent magnets was demonstrated for the first time ever. The measured storage time in this feasibility study was (882 ± 16) s. At this level of accuracy no depolarization was observed.Further improvement in the accuracy of any neutron lifetime experiment by means of ultracold neutrons (UCN) in material bottles is limited due to unavoidable systematic effects when the UCN are reflected from the walls. However, such effects can be excluded in principle if magnetic trapping of UCN is used. The storage of UCN in a small magnetic trap made of permanent magnets was demonstrated for the first time ever. The measured storage time in this feasibility study was (882 ± 16) s. At this level of accuracy no depolarization was observed.

Journal of Research of the National Institute of Standards and TechnologyJul 1, 200523 citations

Modeling of ultracold neutron motion within the UCN

\tau

magneto-gravitational trap