First measurement of the neutron β asymmetry with ultracold neutrons

R. W. Pattie; J. Anaya; H. O. Back; J. G. Boissevain; T. J. Bowles; L. J. Broussard; R. Carr; D. J. Clark; S. Currie; S. Du; B. W. Filippone; P. Geltenbort; A. García; A. Hawari; K. P. Hickerson; R. Hill; M. Hino; S. A. Hoedl; G. E. Hogan; A. T. Holley; T. M. Ito; T. Kawai; K. Kirch; S. Kitagaki; S. K. Lamoreaux; C. Y. Liu; J. Liu; M. Makela; R. R. Mammei; J. W. Martin; D. Melconian; N. Meier; M. P. Mendenhall; C. L. Morris; R. Mortensen; A. Pichlmaier; M. L. Pitt; B. Plaster; J. C. Ramsey; R. Rios; K. Sabourov; A. L. Sallaska; A. Saunders; R. Schmid; S. Seestrom; C. Servicky; S. K.L. Sjue; D. Smith; W. E. Sondheim; E. Tatar; W. Teasdale; C. Terai; B. Tipton; M. Utsuro; R. B. Vogelaar; B. W. Wehring; Y. P. Xu; A. R. Young; J. Yuan

doi:10.1103/PhysRevLett.102.012301

First measurement of the neutron β asymmetry with ultracold neutrons

R. W. Pattie, J. Anaya, H. O. Back, J. G. Boissevain, T. J. Bowles, L. J. Broussard, R. Carr, D. J. Clark, S. Currie, S. Du, B. W. Filippone, P. Geltenbort, A. García, A. Hawari, K. P. Hickerson, R. Hill, M. Hino, S. A. Hoedl, G. E. Hogan, A. T. HolleyT. M. Ito, T. Kawai, K. Kirch, S. Kitagaki, S. K. Lamoreaux, C. Y. Liu, J. Liu, M. Makela, R. R. Mammei, J. W. Martin, D. Melconian, N. Meier, M. P. Mendenhall, C. L. Morris, R. Mortensen, A. Pichlmaier, M. L. Pitt, B. Plaster, J. C. Ramsey, R. Rios, K. Sabourov, A. L. Sallaska, A. Saunders, R. Schmid, S. Seestrom, C. Servicky, S. K.L. Sjue, D. Smith, W. E. Sondheim, E. Tatar, W. Teasdale, C. Terai, B. Tipton, M. Utsuro, R. B. Vogelaar, B. W. Wehring, Y. P. Xu, A. R. Young, J. Yuan

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Abstract

We report the first measurement of an angular correlation parameter in neutron β decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for ∼30s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with a static 7 T field external to the decay volume provides a 420 neV potential energy barrier to the spin state parallel to the field, polarizing the UCN before they pass through an adiabatic fast passage spin flipper and enter a decay volume, situated within a 1 T field in a 2×2π solenoidal spectrometer. We determine a value for the β-asymmetry parameter A0=-0.1138±0.0046±0.0021.

Original language	English
Article number	012301
Journal	Physical Review Letters
Volume	102
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevLett.102.012301
State	Published - Jan 5 2009
Externally published	Yes

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Pattie, R. W., Anaya, J., Back, H. O., Boissevain, J. G., Bowles, T. J., Broussard, L. J., Carr, R., Clark, D. J., Currie, S., Du, S., Filippone, B. W., Geltenbort, P., García, A., Hawari, A., Hickerson, K. P., Hill, R., Hino, M., Hoedl, S. A., Hogan, G. E., ... Yuan, J. (2009). First measurement of the neutron β asymmetry with ultracold neutrons. Physical Review Letters, 102(1), Article 012301. https://doi.org/10.1103/PhysRevLett.102.012301

@article{624fe23a501a48578b7064797ae5c6fc,

title = "First measurement of the neutron β asymmetry with ultracold neutrons",

abstract = "We report the first measurement of an angular correlation parameter in neutron β decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for ∼30s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with a static 7 T field external to the decay volume provides a 420 neV potential energy barrier to the spin state parallel to the field, polarizing the UCN before they pass through an adiabatic fast passage spin flipper and enter a decay volume, situated within a 1 T field in a 2×2π solenoidal spectrometer. We determine a value for the β-asymmetry parameter A0=-0.1138±0.0046±0.0021.",

author = "Pattie, {R. W.} and J. Anaya and Back, {H. O.} and Boissevain, {J. G.} and Bowles, {T. J.} and Broussard, {L. J.} and R. Carr and Clark, {D. J.} and S. Currie and S. Du and Filippone, {B. W.} and P. Geltenbort and A. Garc{\'i}a and A. Hawari and Hickerson, {K. P.} and R. Hill and M. Hino and Hoedl, {S. A.} and Hogan, {G. E.} and Holley, {A. T.} and Ito, {T. M.} and T. Kawai and K. Kirch and S. Kitagaki and Lamoreaux, {S. K.} and Liu, {C. Y.} and J. Liu and M. Makela and Mammei, {R. R.} and Martin, {J. W.} and D. Melconian and N. Meier and Mendenhall, {M. P.} and Morris, {C. L.} and R. Mortensen and A. Pichlmaier and Pitt, {M. L.} and B. Plaster and Ramsey, {J. C.} and R. Rios and K. Sabourov and Sallaska, {A. L.} and A. Saunders and R. Schmid and S. Seestrom and C. Servicky and Sjue, {S. K.L.} and D. Smith and Sondheim, {W. E.} and E. Tatar and W. Teasdale and C. Terai and B. Tipton and M. Utsuro and Vogelaar, {R. B.} and Wehring, {B. W.} and Xu, {Y. P.} and Young, {A. R.} and J. Yuan",

year = "2009",

month = jan,

day = "5",

doi = "10.1103/PhysRevLett.102.012301",

language = "English",

volume = "102",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "1",

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Pattie, RW, Anaya, J, Back, HO, Boissevain, JG, Bowles, TJ, Broussard, LJ, Carr, R, Clark, DJ, Currie, S, Du, S, Filippone, BW, Geltenbort, P, García, A, Hawari, A, Hickerson, KP, Hill, R, Hino, M, Hoedl, SA, Hogan, GE, Holley, AT, Ito, TM, Kawai, T, Kirch, K, Kitagaki, S, Lamoreaux, SK, Liu, CY, Liu, J, Makela, M, Mammei, RR, Martin, JW, Melconian, D, Meier, N, Mendenhall, MP, Morris, CL, Mortensen, R, Pichlmaier, A, Pitt, ML, Plaster, B, Ramsey, JC, Rios, R, Sabourov, K, Sallaska, AL, Saunders, A, Schmid, R, Seestrom, S, Servicky, C, Sjue, SKL, Smith, D, Sondheim, WE, Tatar, E, Teasdale, W, Terai, C, Tipton, B, Utsuro, M, Vogelaar, RB, Wehring, BW, Xu, YP, Young, AR & Yuan, J 2009, 'First measurement of the neutron β asymmetry with ultracold neutrons', Physical Review Letters, vol. 102, no. 1, 012301. https://doi.org/10.1103/PhysRevLett.102.012301

TY - JOUR

T1 - First measurement of the neutron β asymmetry with ultracold neutrons

AU - Pattie, R. W.

AU - Anaya, J.

AU - Back, H. O.

AU - Boissevain, J. G.

AU - Bowles, T. J.

AU - Broussard, L. J.

AU - Carr, R.

AU - Clark, D. J.

AU - Currie, S.

AU - Du, S.

AU - Filippone, B. W.

AU - Geltenbort, P.

AU - García, A.

AU - Hawari, A.

AU - Hickerson, K. P.

AU - Hill, R.

AU - Hino, M.

AU - Hoedl, S. A.

AU - Hogan, G. E.

AU - Holley, A. T.

AU - Ito, T. M.

AU - Kawai, T.

AU - Kirch, K.

AU - Kitagaki, S.

AU - Lamoreaux, S. K.

AU - Liu, C. Y.

AU - Liu, J.

AU - Makela, M.

AU - Mammei, R. R.

AU - Martin, J. W.

AU - Melconian, D.

AU - Meier, N.

AU - Mendenhall, M. P.

AU - Morris, C. L.

AU - Mortensen, R.

AU - Pichlmaier, A.

AU - Pitt, M. L.

AU - Plaster, B.

AU - Ramsey, J. C.

AU - Rios, R.

AU - Sabourov, K.

AU - Sallaska, A. L.

AU - Saunders, A.

AU - Schmid, R.

AU - Seestrom, S.

AU - Servicky, C.

AU - Sjue, S. K.L.

AU - Smith, D.

AU - Sondheim, W. E.

AU - Tatar, E.

AU - Teasdale, W.

AU - Terai, C.

AU - Tipton, B.

AU - Utsuro, M.

AU - Vogelaar, R. B.

AU - Wehring, B. W.

AU - Xu, Y. P.

AU - Young, A. R.

AU - Yuan, J.

PY - 2009/1/5

Y1 - 2009/1/5

N2 - We report the first measurement of an angular correlation parameter in neutron β decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for ∼30s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with a static 7 T field external to the decay volume provides a 420 neV potential energy barrier to the spin state parallel to the field, polarizing the UCN before they pass through an adiabatic fast passage spin flipper and enter a decay volume, situated within a 1 T field in a 2×2π solenoidal spectrometer. We determine a value for the β-asymmetry parameter A0=-0.1138±0.0046±0.0021.

AB - We report the first measurement of an angular correlation parameter in neutron β decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for ∼30s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with a static 7 T field external to the decay volume provides a 420 neV potential energy barrier to the spin state parallel to the field, polarizing the UCN before they pass through an adiabatic fast passage spin flipper and enter a decay volume, situated within a 1 T field in a 2×2π solenoidal spectrometer. We determine a value for the β-asymmetry parameter A0=-0.1138±0.0046±0.0021.

UR - http://www.scopus.com/inward/record.url?scp=58649116887&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.102.012301

DO - 10.1103/PhysRevLett.102.012301

M3 - Article

AN - SCOPUS:58649116887

SN - 0031-9007

VL - 102

JO - Physical Review Letters

JF - Physical Review Letters

IS - 1

M1 - 012301

ER -

First measurement of the neutron β asymmetry with ultracold neutrons

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