Measurement of the neutron β-asymmetry parameter A0 with ultracold neutrons

B. Plaster; R. Rios; H. O. Back; T. J. Bowles; L. J. Broussard; R. Carr; S. Clayton; S. Currie; B. W. Filippone; A. García; P. Geltenbort; K. P. Hickerson; J. Hoagland; G. E. Hogan; B. Hona; A. T. Holley; T. M. Ito; C. Y. Liu; J. Liu; M. Makela; R. R. Mammei; J. W. Martin; D. Melconian; M. P. Mendenhall; C. L. Morris; R. Mortensen; R. W. Pattie; A. Pérez Galván; M. L. Pitt; J. C. Ramsey; R. Russell; A. Saunders; R. Schmid; S. J. Seestrom; S. Sjue; W. E. Sondheim; E. Tatar; B. Tipton; R. B. Vogelaar; B. Vorndick; C. Wrede; Y. P. Xu; H. Yan; A. R. Young; J. Yuan

doi:10.1103/PhysRevC.86.055501

Measurement of the neutron β-asymmetry parameter A₀ with ultracold neutrons

B. Plaster, R. Rios, H. O. Back, T. J. Bowles, L. J. Broussard, R. Carr, S. Clayton, S. Currie, B. W. Filippone, A. García, P. Geltenbort, K. P. Hickerson, J. Hoagland, G. E. Hogan, B. Hona, A. T. Holley, T. M. Ito, C. Y. Liu, J. Liu, M. MakelaR. R. Mammei, J. W. Martin, D. Melconian, M. P. Mendenhall, C. L. Morris, R. Mortensen, R. W. Pattie, A. Pérez Galván, M. L. Pitt, J. C. Ramsey, R. Russell, A. Saunders, R. Schmid, S. J. Seestrom, S. Sjue, W. E. Sondheim, E. Tatar, B. Tipton, R. B. Vogelaar, B. Vorndick, C. Wrede, Y. P. Xu, H. Yan, A. R. Young, J. Yuan

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

44 Scopus citations

Abstract

We present a detailed report of a measurement of the neutron β-asymmetry parameter A₀, the parity-violating angular correlation between the neutron spin and the decay electron momentum, performed with polarized ultracold neutrons (UCN). UCN were extracted from a pulsed spallation solid deuterium source and polarized via transport through a 7-T magnetic field. The polarized UCN were then transported through an adiabatic-fast-passage spin-flipper field region, prior to storage in a cylindrical decay volume situated within a 1-T 2×2π solenoidal spectrometer. The asymmetry was extracted from measurements of the decay electrons in multiwire proportional chamber and plastic scintillator detector packages located on both ends of the spectrometer. From an analysis of data acquired during runs in 2008 and 2009, we report A₀=-0. 11966±0.00089-0.00140+0.00123, from which we extract a value for the ratio of the weak axial-vector and vector coupling constants of the nucleon, λ=g_A/g_V=-1.27590±0.00239-0.00377+0.00331. Complete details of the analysis are presented.

Original language	English
Article number	055501
Journal	Physical Review C - Nuclear Physics
Volume	86
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.86.055501
State	Published - Nov 12 2012

Funding

Funders	Funder number
Directorate for Mathematical and Physical Sciences	0555674, 1005233, 0855538, 0653222

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1103/PhysRevC.86.055501

Cite this

Plaster, B., Rios, R., Back, H. O., Bowles, T. J., Broussard, L. J., Carr, R., Clayton, S., Currie, S., Filippone, B. W., García, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Hogan, G. E., Hona, B., Holley, A. T., Ito, T. M., Liu, C. Y., Liu, J., ... Yuan, J. (2012). Measurement of the neutron β-asymmetry parameter A₀ with ultracold neutrons. Physical Review C - Nuclear Physics, 86(5), Article 055501. https://doi.org/10.1103/PhysRevC.86.055501

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title = "Measurement of the neutron β-asymmetry parameter A0 with ultracold neutrons",

abstract = "We present a detailed report of a measurement of the neutron β-asymmetry parameter A0, the parity-violating angular correlation between the neutron spin and the decay electron momentum, performed with polarized ultracold neutrons (UCN). UCN were extracted from a pulsed spallation solid deuterium source and polarized via transport through a 7-T magnetic field. The polarized UCN were then transported through an adiabatic-fast-passage spin-flipper field region, prior to storage in a cylindrical decay volume situated within a 1-T 2×2π solenoidal spectrometer. The asymmetry was extracted from measurements of the decay electrons in multiwire proportional chamber and plastic scintillator detector packages located on both ends of the spectrometer. From an analysis of data acquired during runs in 2008 and 2009, we report A0=-0. 11966±0.00089-0.00140+0.00123, from which we extract a value for the ratio of the weak axial-vector and vector coupling constants of the nucleon, λ=gA/gV=-1.27590±0.00239-0.00377+0.00331. Complete details of the analysis are presented.",

author = "B. Plaster and R. Rios and Back, {H. O.} and Bowles, {T. J.} and Broussard, {L. J.} and R. Carr and S. Clayton and S. Currie and Filippone, {B. W.} and A. Garc{\'i}a and P. Geltenbort and Hickerson, {K. P.} and J. Hoagland and Hogan, {G. E.} and B. Hona and Holley, {A. T.} and Ito, {T. M.} and Liu, {C. Y.} and J. Liu and M. Makela and Mammei, {R. R.} and Martin, {J. W.} and D. Melconian and Mendenhall, {M. P.} and Morris, {C. L.} and R. Mortensen and Pattie, {R. W.} and {P{\'e}rez Galv{\'a}n}, A. and Pitt, {M. L.} and Ramsey, {J. C.} and R. Russell and A. Saunders and R. Schmid and Seestrom, {S. J.} and S. Sjue and Sondheim, {W. E.} and E. Tatar and B. Tipton and Vogelaar, {R. B.} and B. Vorndick and C. Wrede and Xu, {Y. P.} and H. Yan and Young, {A. R.} and J. Yuan",

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doi = "10.1103/PhysRevC.86.055501",

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Plaster, B, Rios, R, Back, HO, Bowles, TJ, Broussard, LJ, Carr, R, Clayton, S, Currie, S, Filippone, BW, García, A, Geltenbort, P, Hickerson, KP, Hoagland, J, Hogan, GE, Hona, B, Holley, AT, Ito, TM, Liu, CY, Liu, J, Makela, M, Mammei, RR, Martin, JW, Melconian, D, Mendenhall, MP, Morris, CL, Mortensen, R, Pattie, RW, Pérez Galván, A, Pitt, ML, Ramsey, JC, Russell, R, Saunders, A, Schmid, R, Seestrom, SJ, Sjue, S, Sondheim, WE, Tatar, E, Tipton, B, Vogelaar, RB, Vorndick, B, Wrede, C, Xu, YP, Yan, H, Young, AR & Yuan, J 2012, 'Measurement of the neutron β-asymmetry parameter A₀ with ultracold neutrons', Physical Review C - Nuclear Physics, vol. 86, no. 5, 055501. https://doi.org/10.1103/PhysRevC.86.055501

TY - JOUR

T1 - Measurement of the neutron β-asymmetry parameter A0 with ultracold neutrons

AU - Plaster, B.

AU - Rios, R.

AU - Back, H. O.

AU - Bowles, T. J.

AU - Broussard, L. J.

AU - Carr, R.

AU - Clayton, S.

AU - Currie, S.

AU - Filippone, B. W.

AU - García, A.

AU - Geltenbort, P.

AU - Hickerson, K. P.

AU - Hoagland, J.

AU - Hogan, G. E.

AU - Hona, B.

AU - Holley, A. T.

AU - Ito, T. M.

AU - Liu, C. Y.

AU - Liu, J.

AU - Makela, M.

AU - Mammei, R. R.

AU - Martin, J. W.

AU - Melconian, D.

AU - Mendenhall, M. P.

AU - Morris, C. L.

AU - Mortensen, R.

AU - Pattie, R. W.

AU - Pérez Galván, A.

AU - Pitt, M. L.

AU - Ramsey, J. C.

AU - Russell, R.

AU - Saunders, A.

AU - Schmid, R.

AU - Seestrom, S. J.

AU - Sjue, S.

AU - Sondheim, W. E.

AU - Tatar, E.

AU - Tipton, B.

AU - Vogelaar, R. B.

AU - Vorndick, B.

AU - Wrede, C.

AU - Xu, Y. P.

AU - Yan, H.

AU - Young, A. R.

AU - Yuan, J.

PY - 2012/11/12

Y1 - 2012/11/12

N2 - We present a detailed report of a measurement of the neutron β-asymmetry parameter A0, the parity-violating angular correlation between the neutron spin and the decay electron momentum, performed with polarized ultracold neutrons (UCN). UCN were extracted from a pulsed spallation solid deuterium source and polarized via transport through a 7-T magnetic field. The polarized UCN were then transported through an adiabatic-fast-passage spin-flipper field region, prior to storage in a cylindrical decay volume situated within a 1-T 2×2π solenoidal spectrometer. The asymmetry was extracted from measurements of the decay electrons in multiwire proportional chamber and plastic scintillator detector packages located on both ends of the spectrometer. From an analysis of data acquired during runs in 2008 and 2009, we report A0=-0. 11966±0.00089-0.00140+0.00123, from which we extract a value for the ratio of the weak axial-vector and vector coupling constants of the nucleon, λ=gA/gV=-1.27590±0.00239-0.00377+0.00331. Complete details of the analysis are presented.

AB - We present a detailed report of a measurement of the neutron β-asymmetry parameter A0, the parity-violating angular correlation between the neutron spin and the decay electron momentum, performed with polarized ultracold neutrons (UCN). UCN were extracted from a pulsed spallation solid deuterium source and polarized via transport through a 7-T magnetic field. The polarized UCN were then transported through an adiabatic-fast-passage spin-flipper field region, prior to storage in a cylindrical decay volume situated within a 1-T 2×2π solenoidal spectrometer. The asymmetry was extracted from measurements of the decay electrons in multiwire proportional chamber and plastic scintillator detector packages located on both ends of the spectrometer. From an analysis of data acquired during runs in 2008 and 2009, we report A0=-0. 11966±0.00089-0.00140+0.00123, from which we extract a value for the ratio of the weak axial-vector and vector coupling constants of the nucleon, λ=gA/gV=-1.27590±0.00239-0.00377+0.00331. Complete details of the analysis are presented.

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U2 - 10.1103/PhysRevC.86.055501

DO - 10.1103/PhysRevC.86.055501

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JO - Physical Review C - Nuclear Physics

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