A Caltech Library Service

Status of the UCNτ experiment

Pattie, R. W., Jr. and Callahan, N. B. and Cude-Woods, C. and Adamek, E. R. and Adams, M. and Barlow, D. and Blatnik, M. and Bowman, D. and Broussard, L. J. and Clayton, S. and Currie, S. and Dees, E. B. and Ding, X. and Fellers, D. and Fox, W. and Fries, E. and Gonzalez, F. and Geltenbort, P. and Hickerson, K. P. and Hoffbauer, M. A. and Hoffman, K. and Holley, A. T. and Howard, D. and Ito, T. M. and Komives, A. and Liu, C. Y. and Makela, M. and Medina, J. and Morley, D. and Morris, C. L. and O'Connor, T. and Penttilä, S. I. and Ramsey, J. C. and Roberts, A. and Salvat, D. and Saunders, A. and Seestrom, S. J. and Sharapov, E. I. and Sjue, S. K. L. and Snow, W. M. and Sprow, A. and Vanderwerp, J. and Vogelaar, B. and P.L., Walstrom and Wang, Z. and Weaver, H. and Wexler, J. and Womack, T. L. and Young, A. R. and Zeck, B. A. (2019) Status of the UCNτ experiment. EPJ Web of Conferences, 219 . Art. No. 03004. ISSN 2100-014X.

[img] PDF - Published Version
Creative Commons Attribution.


Use this Persistent URL to link to this item:


The neutron is the simplest nuclear system that can be used to probe the structure of the weak interaction and search for physics beyond the standard model. Measurements of neutron lifetime and β-decay correlation coefficients with precisions of 0.02% and 0.1%, respectively, would allow for stringent constraints on new physics. The UCNτ experiment uses an asymmetric magneto-gravitational UCN trap with in situ counting of surviving neutrons to measure the neutron lifetime, τ_n = 877.7s (0.7s)_(stat) (+0.4/−0.2s)_(sys). We discuss the recent result from UCNτ, the status of ongoing data collection and analysis, and the path toward a 0.25 s measurement of the neutron lifetime with UCNτ.

Item Type:Article
Related URLs:
URLURL TypeDescription
Hickerson, K. P.0000-0001-7647-119X
Ito, T. M.0000-0003-3494-6796
Morris, C. L.0000-0003-2141-0255
Additional Information:© 2019 The Authors, published by EDP Sciences. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Published online 12 December 2019. The UCNτ collaboration would like to thank the LANSCE accelerator operators and staff, without their dedication and expertise this experiment would not have been possible. This work was supported by the Los Alamos Laboratory Directed Research and Development (LDRD) office (no. 20140568DR), the LDRD Program of Oak Ridge National Laboratory, managed by UT-Battelle (no. 8215), the National Science Foundation (nos. 130692, 1307426, 161454, 1306997, and 1553861), NIST Precision Measurement Grant, IU Center for Space Time Symmetries (IUCSS), the LANSCE Rosen Scholarship program, and U.S. DOE Low Energy Nuclear Physics (nos. DE-FG02-97ER41042 and DE-AC05-00OR22725).
Funding AgencyGrant Number
Los Alamos National Laboratory20140568DR
Oak Ridge National Laboratory8215
National Institute of Standards and Technology (NIST)UNSPECIFIED
IU Center for Space Time Symmetries (IUCSS)UNSPECIFIED
LANSCE Rosen Scholarship ProgramUNSPECIFIED
Department of Energy (DOE)DE-FG02-97ER41042
Department of Energy (DOE)DE-AC05-00OR22725
Record Number:CaltechAUTHORS:20200309-132600389
Persistent URL:
Official Citation:Status of the UCNτ experiment. R.W. Pattie, N.B. Callahan, C. Cude-Woods, E.R. Adamek, M. Adams, D. Barlow, M. Blatnik, Bowman D., L.J. Broussard, S. Clayton, S. Currie, E.B. Dees, X. Ding, D. Fellers, W. Fox, E. Fries, F. Gonzalez, P. Geltenbort, K.P. Hickerson, M.A. Hoffbauer, K. Hoffman, A.T. Holley, D. Howard, T.M. Ito, A. Komives, C.Y. Liu, Makela M., J. Medina, D. Morley, C.L. Morris, T. O'Connor, S.I. Penttilä, J.C. Ramsey, A. Roberts, D. Salvat, A. Saunders, S.J. Seestrom, E.I. Sharapov, S.K.L. Sjue, W.M. Snow, A. Sprow, J. Vanderwerp, B. Vogelaar, Walstrom P.L., Z. Wang, H. Weaver, J. Wexler, T.L. Womack, A.R. Young and B.A. Zeck. EPJ Web Conf., 219 (2019) 03004; DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101788
Deposited By: Tony Diaz
Deposited On:09 Mar 2020 21:17
Last Modified:09 Mar 2020 21:17

Repository Staff Only: item control page