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28 March 2024
 
  » arxiv » 1512.9351

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High-Sensitivity Measurement of 3He-4He 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 ; C. M. Swank ; R. Janssens ; C. L. Jiang ; R. H. Scott ; R. C. Pardo ; K. E. Rehm ; R. Vondrasek ; C. M. O'Shaughnessy ; M. Paul ; L. Yang ;
Date 31 Dec 2015
AbstractResearch 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 10e-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.
Source arXiv, 1512.9351
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