The Beta-Neutrino Correlation in Sodium-21 and Other Nuclei

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We have measured the mbox beta - nu correlation coefficient,a_beta nu, in 21Na using a laser-trapped sample. We measure the energyspectrum of the recoil nuclei by measuring their time-of-flight incoincidence with the atomic electrons shaken off in beta decay. Highdetectionefficiency of these low-energy electrons allows good countingstatistics, even with low trap density, which suppresses thephotoassociation of molecular sodium, which can cause a large systematicerror. Our measurement, with a 1 percent fractional uncertainty, agreeswith the Standard Model prediction but disagrees with our previousmeasurement which was susceptible to error introduced by molecularsodium. We summarize precise measurements of a_ beta nu and theirconsequences ... continued below

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Vetter, Paul A.; Abo-Shaeer, Jamil; Freedman, Stuart J. & Maruyama, Reina January 16, 2008.

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We have measured the mbox beta - nu correlation coefficient,a_beta nu, in 21Na using a laser-trapped sample. We measure the energyspectrum of the recoil nuclei by measuring their time-of-flight incoincidence with the atomic electrons shaken off in beta decay. Highdetectionefficiency of these low-energy electrons allows good countingstatistics, even with low trap density, which suppresses thephotoassociation of molecular sodium, which can cause a large systematicerror. Our measurement, with a 1 percent fractional uncertainty, agreeswith the Standard Model prediction but disagrees with our previousmeasurement which was susceptible to error introduced by molecularsodium. We summarize precise measurements of a_ beta nu and theirconsequences for searches for Beyond Standard Model scalar and tensorcurrent couplings.

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  • The Fourth Argonne/INT/MSU/JINA RIA TheoryWorkshop on Rare Isotopes and Fundamental Symmetries, Seattle,Washington, September 19 - 22, 2007

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  • Report No.: LBNL--63798
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 928796
  • Archival Resource Key: ark:/67531/metadc895721

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  • January 16, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 30, 2016, 3:41 p.m.

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Vetter, Paul A.; Abo-Shaeer, Jamil; Freedman, Stuart J. & Maruyama, Reina. The Beta-Neutrino Correlation in Sodium-21 and Other Nuclei, article, January 16, 2008; (digital.library.unt.edu/ark:/67531/metadc895721/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.