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. Gentile

V. Gudkov, G. L. Jones

Neutron Symmetries

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

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 - https://www.scopus.com/pages/publications/28844499649

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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