Measurement of the beta-neutrino correlation of sodium-21 usingshakeoff electrons

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The beta-neutrino correlation coefficient, a_beta nu, ismeasured in 21Na by detecting the time-of-flight of the recoil nucleusdetected in coincidence with the atomic electrons shaken off in betadecay. The sample of 21Na is confined in a magneto-optic trap. Highdetection efficiency allows low trap density, which suppresses thephotoassociation of molecular sodium, which can cause a large systematicerror. Suppressing the fraction of trapped atoms in the excited stateusing a dark trap also reduces the photoassociation process, and datataken with this technique are consistent. The main remaining systematicuncertainties come from the measurement of the position and size of theatom trap, and the subtraction of ... continued below

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Vetter, Paul A.; Abo-Shaeer, Jamil R.; Freedman, Stuart J. & Maruyama, Reina January 16, 2007.

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The beta-neutrino correlation coefficient, a_beta nu, ismeasured in 21Na by detecting the time-of-flight of the recoil nucleusdetected in coincidence with the atomic electrons shaken off in betadecay. The sample of 21Na is confined in a magneto-optic trap. Highdetection efficiency allows low trap density, which suppresses thephotoassociation of molecular sodium, which can cause a large systematicerror. Suppressing the fraction of trapped atoms in the excited stateusing a dark trap also reduces the photoassociation process, and datataken with this technique are consistent. The main remaining systematicuncertainties come from the measurement of the position and size of theatom trap, and the subtraction of background. We find mbox a_betanu=0.5502(60), in agreement with the Standard Model prediction of mboxa_beta nu=0.553(2), and disagreeing with a previous measurement which wassusceptible to an error introduced by the presence of molecularsodium.

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  • Journal Name: Physical Review C; Journal Volume: 77; Related Information: Journal Publication Date: 2008

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  • Report No.: LBNL--63797
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 929061
  • Archival Resource Key: ark:/67531/metadc893743

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  • January 16, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 30, 2016, 12:23 p.m.

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Vetter, Paul A.; Abo-Shaeer, Jamil R.; Freedman, Stuart J. & Maruyama, Reina. Measurement of the beta-neutrino correlation of sodium-21 usingshakeoff electrons, article, January 16, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc893743/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.