A Caltech Library Service

High-sensitivity measurement of ^3He−^4He isotopic ratios for ultracold neutron experiments

Mumm, H. P. and Huber, M. G. and Bauder, W. and Abrams, N. and Deibel, C. M and Huffer, C. R. and Huffman, P. R. and Schelhammer, K. W. and Janssens, R. and Jiang, C. L. and Scott, R. H. and Pardo, R. C. and Rehm, K. E. and Vondrasek, R. and Swank, C. M. and O'Shaughnessy, C. M. and Paul, M. and Yang, L. (2016) High-sensitivity measurement of ^3He−^4He isotopic ratios for ultracold neutron experiments. Physical Review C, 93 (6). Art. No. 065502. ISSN 2469-9985. doi:10.1103/PhysRevC.93.065502.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


Research efforts ranging from studies of solid helium to searches for a neutron electric dipole moment require isotopically purified helium with a ratio of ^3He to ^4He at levels below that which can be measured using traditional mass spectroscopy techniques. We demonstrate an approach to such a measurement using accelerator mass spectroscopy, reaching the 10^(−14) level of sensitivity, several orders of magnitude more sensitive than other techniques. Measurements of ^3He/^4He in samples relevant to the measurement of the neutron lifetime indicate the need for substantial corrections. We also argue that there is a clear path forward to sensitivity increases of at least another order of magnitude.

Item Type:Article
Related URLs:
URLURL TypeDescription
Alternate Title:High-sensitivity measurement of He3−He4 isotopic ratios for ultracold neutron experiments
Additional Information:© 2016 American Physical Society. (Received 10 February 2016; published 13 June 2016) We acknowledge the support of the NIST, U.S. Department of Commerce, in providing support for facilities used in this work. This work is also supported in part by the U.S. National Science Foundation under Grant No. PHY-0855593 and by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contracts No. DE-AC02-06CH11357 and No. DE-FG02-97ER41042. This research used resources of ANL's ATLAS facility, which is a DOE Office of Science User Facility.
Funding AgencyGrant Number
National Institute of Standards and Technology (NIST)UNSPECIFIED
Department of Energy (DOE)DE-AC02-06CH11357
Department of Energy (DOE)DE-FG02-97ER41042
Issue or Number:6
Record Number:CaltechAUTHORS:20160613-103446787
Persistent URL:
Official Citation:High-sensitivity measurement of He3−He4 isotopic ratios for ultracold neutron experiments H. P. Mumm, M. G. Huber, W. Bauder, N. Abrams, C. M Deibel, C. R. Huffer, P. R. Huffman, K. W. Schelhammer, R. Janssens, C. L. Jiang, R. H. Scott, R. C. Pardo, K. E. Rehm, R. Vondrasek, C. M. Swank, C. M. O'Shaughnessy, M. Paul, and L. Yang Phys. Rev. C 93, 065502
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67869
Deposited By: George Porter
Deposited On:13 Jun 2016 18:04
Last Modified:11 Nov 2021 03:55

Repository Staff Only: item control page