First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on He 3

M. T. Gericke; S. Baeßler; L. Barrón-Palos; N. Birge; J. D. Bowman; J. Calarco; V. Cianciolo; C. E. Coppola; C. B. Crawford; N. Fomin; I. Garishvili; G. L. Greene; G. M. Hale; J. Hamblen; C. Hayes; E. Iverson; M. L. Kabir; M. McCrea; E. Plemons; A. Ramírez-Morales; P. E. Mueller; I. Novikov; S. Penttila; E. M. Scott; J. Watts; C. Wickersham

doi:10.1103/PhysRevLett.125.131803

First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on He 3

M. T. Gericke, S. Baeßler, L. Barrón-Palos, N. Birge, J. D. Bowman, J. Calarco, V. Cianciolo, C. E. Coppola, C. B. Crawford, N. Fomin, I. Garishvili, G. L. Greene, G. M. Hale, J. Hamblen, C. Hayes, E. Iverson, M. L. Kabir, M. McCrea, E. Plemons, A. Ramírez-MoralesP. E. Mueller, I. Novikov, S. Penttila, E. M. Scott, J. Watts, C. Wickersham

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Abstract

We report the first precision measurement of the parity-violating asymmetry in the direction of proton momentum with respect to the neutron spin, in the reaction He3(n,p)3H, using the capture of polarized cold neutrons in an unpolarized active He3 target. The asymmetry is a result of the weak interaction between nucleons, which remains one of the least well-understood aspects of electroweak theory. The measurement provides an important benchmark for modern effective field theory and potential model calculations. Measurements like this are necessary to determine the spin-isospin structure of the hadronic weak interaction. Our asymmetry result is APV=[1.55±0.97(stat)±0.24(sys)]×10-8, which has the smallest uncertainty of any hadronic parity-violating asymmetry measurement so far.

Original language	English
Article number	131803
Journal	Physical Review Letters
Volume	125
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.125.131803
State	Published - Sep 2020

Bibliographical note

Publisher Copyright:
© 2020 American Physical Society.

ASJC Scopus subject areas

General Physics and Astronomy

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Gericke, M. T., Baeßler, S., Barrón-Palos, L., Birge, N., Bowman, J. D., Calarco, J., Cianciolo, V., Coppola, C. E., Crawford, C. B., Fomin, N., Garishvili, I., Greene, G. L., Hale, G. M., Hamblen, J., Hayes, C., Iverson, E., Kabir, M. L., McCrea, M., Plemons, E., ... Wickersham, C. (2020). First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on He 3. Physical Review Letters, 125(13), Article 131803. https://doi.org/10.1103/PhysRevLett.125.131803

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title = "First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on He 3",

abstract = "We report the first precision measurement of the parity-violating asymmetry in the direction of proton momentum with respect to the neutron spin, in the reaction He3(n,p)3H, using the capture of polarized cold neutrons in an unpolarized active He3 target. The asymmetry is a result of the weak interaction between nucleons, which remains one of the least well-understood aspects of electroweak theory. The measurement provides an important benchmark for modern effective field theory and potential model calculations. Measurements like this are necessary to determine the spin-isospin structure of the hadronic weak interaction. Our asymmetry result is APV=[1.55±0.97(stat)±0.24(sys)]×10-8, which has the smallest uncertainty of any hadronic parity-violating asymmetry measurement so far.",

author = "Gericke, {M. T.} and S. Bae{\ss}ler and L. Barr{\'o}n-Palos and N. Birge and Bowman, {J. D.} and J. Calarco and V. Cianciolo and Coppola, {C. E.} and Crawford, {C. B.} and N. Fomin and I. Garishvili and Greene, {G. L.} and Hale, {G. M.} and J. Hamblen and C. Hayes and E. Iverson and Kabir, {M. L.} and M. McCrea and E. Plemons and A. Ram{\'i}rez-Morales and Mueller, {P. E.} and I. Novikov and S. Penttila and Scott, {E. M.} and J. Watts and C. Wickersham",

note = "Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

year = "2020",

month = sep,

doi = "10.1103/PhysRevLett.125.131803",

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volume = "125",

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Gericke, MT, Baeßler, S, Barrón-Palos, L, Birge, N, Bowman, JD, Calarco, J, Cianciolo, V, Coppola, CE, Crawford, CB, Fomin, N, Garishvili, I, Greene, GL, Hale, GM, Hamblen, J, Hayes, C, Iverson, E, Kabir, ML, McCrea, M, Plemons, E, Ramírez-Morales, A, Mueller, PE, Novikov, I, Penttila, S, Scott, EM, Watts, J & Wickersham, C 2020, 'First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on He 3', Physical Review Letters, vol. 125, no. 13, 131803. https://doi.org/10.1103/PhysRevLett.125.131803

TY - JOUR

T1 - First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on He 3

AU - Gericke, M. T.

AU - Baeßler, S.

AU - Barrón-Palos, L.

AU - Birge, N.

AU - Bowman, J. D.

AU - Calarco, J.

AU - Cianciolo, V.

AU - Coppola, C. E.

AU - Crawford, C. B.

AU - Fomin, N.

AU - Garishvili, I.

AU - Greene, G. L.

AU - Hale, G. M.

AU - Hamblen, J.

AU - Hayes, C.

AU - Iverson, E.

AU - Kabir, M. L.

AU - McCrea, M.

AU - Plemons, E.

AU - Ramírez-Morales, A.

AU - Mueller, P. E.

AU - Novikov, I.

AU - Penttila, S.

AU - Scott, E. M.

AU - Watts, J.

AU - Wickersham, C.

PY - 2020/9

Y1 - 2020/9

N2 - We report the first precision measurement of the parity-violating asymmetry in the direction of proton momentum with respect to the neutron spin, in the reaction He3(n,p)3H, using the capture of polarized cold neutrons in an unpolarized active He3 target. The asymmetry is a result of the weak interaction between nucleons, which remains one of the least well-understood aspects of electroweak theory. The measurement provides an important benchmark for modern effective field theory and potential model calculations. Measurements like this are necessary to determine the spin-isospin structure of the hadronic weak interaction. Our asymmetry result is APV=[1.55±0.97(stat)±0.24(sys)]×10-8, which has the smallest uncertainty of any hadronic parity-violating asymmetry measurement so far.

AB - We report the first precision measurement of the parity-violating asymmetry in the direction of proton momentum with respect to the neutron spin, in the reaction He3(n,p)3H, using the capture of polarized cold neutrons in an unpolarized active He3 target. The asymmetry is a result of the weak interaction between nucleons, which remains one of the least well-understood aspects of electroweak theory. The measurement provides an important benchmark for modern effective field theory and potential model calculations. Measurements like this are necessary to determine the spin-isospin structure of the hadronic weak interaction. Our asymmetry result is APV=[1.55±0.97(stat)±0.24(sys)]×10-8, which has the smallest uncertainty of any hadronic parity-violating asymmetry measurement so far.

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DO - 10.1103/PhysRevLett.125.131803

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C2 - 33034491

AN - SCOPUS:85092802189

SN - 0031-9007

VL - 125

JO - Physical Review Letters

JF - Physical Review Letters

IS - 13

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ER -

First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on He 3

Abstract

Bibliographical note

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