Published January 9, 2009
| Published
Journal Article
Open
First measurement of the neutron β asymmetry with ultracold neutrons
- Creators
- Pattie, R. W., Jr.
- Anaya, J.
- Back, H. O.
- Boissevain, J. G.
- Bowles, T. J.
- Broussard, L. J.
- Carr, R.
- Clark, D. J.
- Currie, S.
- Du, S.
-
Filippone, B. W.
- Geltenbort, P.
- García, A.
- Hawari, A.
-
Hickerson, K. P.
- Hill, R.
- Hino, M.
- Hoedl, S. A.
- Hogan, G. E.
- Holley, A. T.
-
Ito, T. M.
- Kawai, T.
- Kirch, K.
- Kitagaki, S.
- Lamoreaux, S. K.
- Liu, C.-Y.
- Liu, J.
- Makela, M.
- Mammei, R. R.
- Martin, J. W.
- Melconian, D.
- Meier, N.
- Mendenhall, M. P.
-
Morris, C. L.
- Mortensen, R.
- Pichlmaier, A.
- Pitt, M. L.
- Plaster, B.
- Ramsey, J. C.
- Rios, R.
- Sabourov, K.
- Sallaska, A. L.
- Saunders, A.
- Schmid, R.
- Seestrom, S.
- Servicky, C.
- Sjue, S. K. L.
- Smith, D.
- Sondheim, W. E.
- Tatar, E.
- Teasdale, W.
- Terai, C.
- Tipton, B.
- Utsuro, M.
- Vogelaar, R. B.
- Wehring, B. W.
- Xu, Y. P.
- Young, A. R.
- Yuan, J.
Abstract
We report the first measurement of an angular correlation parameter in neutron β decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for ~30 s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with a static 7 T field external to the decay volume provides a 420 neV potential energy barrier to the spin state parallel to the field, polarizing the UCN before they pass through an adiabatic fast passage spin flipper and enter a decay volume, situated within a 1 T field in a 2×2π solenoidal spectrometer. We determine a value for the β-asymmetry parameter A_0=-0.1138±0.0046±0.0021.
Additional Information
© 2009 The American Physical Society. Received 17 September 2008; published 5 January 2009. This work was supported in part by the Department of Energy, National Science Foundation, and Los Alamos National Laboratory LDRD. We acknowledge helpful discussions with A. P. Serebrov. PACS numbers: 14.20.Dh, 12.15.Ff, 12.15.Hh, 23.40.Bw.Attached Files
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Additional details
- Eprint ID
- 14811
- Resolver ID
- CaltechAUTHORS:20090805-094145827
- Department of Energy
- NSF
- Los Alamos National Laboratory
- Created
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2009-08-06Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field