Measurement of neutron decay parameters - The abBA experiment

W. S. Wilburn; J. D. Bowman; G. S. Mitchell; J. M. O'Donnell; S. I. Penttila; P. N. Seo; J. R. Calarco; F. W. Hersmann; T. E. Chupp; T. V. Cianciolo; K. P. Rykaczewski; G. R. Young; R. T. De Souza; W. M. Snow; D. Desai; G. L. Greene; R. K. Grzywacz; E. Frlez; D. Pocanic; T. R. Gentile; V. Gudkov; G. L. Jones

doi:10.6028/jres.110.058

Measurement of neutron decay parameters - The abBA experiment

W. S. Wilburn, J. D. Bowman, G. S. Mitchell, J. M. O'Donnell, S. I. Penttila, P. N. Seo, J. R. Calarco, F. W. Hersmann, T. E. Chupp, T. V. Cianciolo, K. P. Rykaczewski, G. R. Young, R. T. De Souza, W. M. Snow, D. Desai, G. L. Greene, R. K. Grzywacz, E. Frlez, D. Pocanic, T. R. GentileV. Gudkov, G. L. Jones

Neutron Symmetries

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Abstract

We are developing an experiment to measure the correlations a, A, and B, and the Fierz interference term b in neutron decay, with a precision of approximately 10^-4. The experiment uses an electromagnetic spectrometer in combination with two large-area segmented silicon detectors to detect the proton and electron from the decay in coincidence, with 4π acceptance for both particles. For the neutron-polarization-dependent observables A and B, precision neutron polarimetry is achieved through the combination of a pulsed neutron beam, under construction at the SNS, and a polarized ³He neutron polarizer. Measuring a and A in the same apparatus provides a redundant determination of λ = g_Ag _V. Uncertainty in λ dominates the uncertainty of CKM unitarity tests.

Original language	English
Pages (from-to)	389-393
Number of pages	5
Journal	Journal of Research of the National Institute of Standards and Technology
Volume	110
Issue number	4
DOIs	https://doi.org/10.6028/jres.110.058
State	Published - 2005

Keywords

Neutron beta decay
Weak interactions

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Wilburn, W. S., Bowman, J. D., Mitchell, G. S., O'Donnell, J. M., Penttila, S. I., Seo, P. N., Calarco, J. R., Hersmann, F. W., Chupp, T. E., Cianciolo, T. V., Rykaczewski, K. P., Young, G. R., De Souza, R. T., Snow, W. M., Desai, D., Greene, G. L., Grzywacz, R. K., Frlez, E., Pocanic, D., ... Jones, G. L. (2005). Measurement of neutron decay parameters - The abBA experiment. Journal of Research of the National Institute of Standards and Technology, 110(4), 389-393. https://doi.org/10.6028/jres.110.058

@article{2347c89bfd0d4394975278736afe3d01,

title = "Measurement of neutron decay parameters - The abBA experiment",

abstract = "We are developing an experiment to measure the correlations a, A, and B, and the Fierz interference term b in neutron decay, with a precision of approximately 10-4. The experiment uses an electromagnetic spectrometer in combination with two large-area segmented silicon detectors to detect the proton and electron from the decay in coincidence, with 4π acceptance for both particles. For the neutron-polarization-dependent observables A and B, precision neutron polarimetry is achieved through the combination of a pulsed neutron beam, under construction at the SNS, and a polarized 3He neutron polarizer. Measuring a and A in the same apparatus provides a redundant determination of λ = gAg V. Uncertainty in λ dominates the uncertainty of CKM unitarity tests.",

keywords = "Neutron beta decay, Weak interactions",

author = "Wilburn, {W. S.} and Bowman, {J. D.} and Mitchell, {G. S.} and O'Donnell, {J. M.} and Penttila, {S. I.} and Seo, {P. N.} and Calarco, {J. R.} and Hersmann, {F. W.} and Chupp, {T. E.} and Cianciolo, {T. V.} and Rykaczewski, {K. P.} and Young, {G. R.} and {De Souza}, {R. T.} and Snow, {W. M.} and D. Desai and Greene, {G. L.} and Grzywacz, {R. K.} and E. Frlez and D. Pocanic and Gentile, {T. R.} and V. Gudkov and Jones, {G. L.}",

year = "2005",

doi = "10.6028/jres.110.058",

language = "English",

volume = "110",

pages = "389--393",

journal = "Journal of Research of the National Institute of Standards and Technology",

issn = "1044-677X",

number = "4",

}

Wilburn, WS, Bowman, JD, Mitchell, GS, O'Donnell, JM, Penttila, SI, Seo, PN, Calarco, JR, Hersmann, FW, Chupp, TE, Cianciolo, TV, Rykaczewski, KP, Young, GR, De Souza, RT, Snow, WM, Desai, D, Greene, GL, Grzywacz, RK, Frlez, E, Pocanic, D, Gentile, TR, Gudkov, V & Jones, GL 2005, 'Measurement of neutron decay parameters - The abBA experiment', Journal of Research of the National Institute of Standards and Technology, vol. 110, no. 4, pp. 389-393. https://doi.org/10.6028/jres.110.058

TY - JOUR

T1 - Measurement of neutron decay parameters - The abBA experiment

AU - Wilburn, W. S.

AU - Bowman, J. D.

AU - Mitchell, G. S.

AU - O'Donnell, J. M.

AU - Penttila, S. I.

AU - Seo, P. N.

AU - Calarco, J. R.

AU - Hersmann, F. W.

AU - Chupp, T. E.

AU - Cianciolo, T. V.

AU - Rykaczewski, K. P.

AU - Young, G. R.

AU - De Souza, R. T.

AU - Snow, W. M.

AU - Desai, D.

AU - Greene, G. L.

AU - Grzywacz, R. K.

AU - Frlez, E.

AU - Pocanic, D.

AU - Gentile, T. R.

AU - Gudkov, V.

AU - Jones, G. L.

PY - 2005

Y1 - 2005

N2 - We are developing an experiment to measure the correlations a, A, and B, and the Fierz interference term b in neutron decay, with a precision of approximately 10-4. The experiment uses an electromagnetic spectrometer in combination with two large-area segmented silicon detectors to detect the proton and electron from the decay in coincidence, with 4π acceptance for both particles. For the neutron-polarization-dependent observables A and B, precision neutron polarimetry is achieved through the combination of a pulsed neutron beam, under construction at the SNS, and a polarized 3He neutron polarizer. Measuring a and A in the same apparatus provides a redundant determination of λ = gAg V. Uncertainty in λ dominates the uncertainty of CKM unitarity tests.

AB - We are developing an experiment to measure the correlations a, A, and B, and the Fierz interference term b in neutron decay, with a precision of approximately 10-4. The experiment uses an electromagnetic spectrometer in combination with two large-area segmented silicon detectors to detect the proton and electron from the decay in coincidence, with 4π acceptance for both particles. For the neutron-polarization-dependent observables A and B, precision neutron polarimetry is achieved through the combination of a pulsed neutron beam, under construction at the SNS, and a polarized 3He neutron polarizer. Measuring a and A in the same apparatus provides a redundant determination of λ = gAg V. Uncertainty in λ dominates the uncertainty of CKM unitarity tests.

KW - Neutron beta decay

KW - Weak interactions

UR - http://www.scopus.com/inward/record.url?scp=28844499649&partnerID=8YFLogxK

U2 - 10.6028/jres.110.058

DO - 10.6028/jres.110.058

M3 - Article

AN - SCOPUS:28844499649

SN - 1044-677X

VL - 110

SP - 389

EP - 393

JO - Journal of Research of the National Institute of Standards and Technology

JF - Journal of Research of the National Institute of Standards and Technology

IS - 4

ER -

Measurement of neutron decay parameters - The abBA experiment

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