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-Morales

P. E. Mueller, I. Novikov, S. Penttila, E. M. Scott, J. Watts, C. Wickersham

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

14 Scopus citations

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.

Funding

We gratefully acknowledge the support of the U.S. Department of Energy Office of Nuclear Physics through Grants No. DE-FG02-03ER41258, No. DE-AC05-00OR22725, No. DE-SC0008107 and No. DE-SC0014622, the U.S. National Science Foundation Grant No. PHY-0855584, the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canadian Foundation for Innovation (CFI), the Mexico National Council of Science and Technology (CONACYT) Grant No. 80444, and the UNAM research Grants (PAPIIT) No. IN111913 and No. IN109120. This research used resources of the Spallation Neutron Source of Oak Ridge National Laboratory, a DOE Office of Science User Facility. We also thank Michele Viviani (INFN Pisa) for very fruitful theory discussions and Jack Thomison (ORNL) for his engineering support.

Funders	Funder number
Oak Ridge National Laboratory
Canada Foundation for Innovation
Natural Sciences and Engineering Research Council of Canada
National Science Foundation Office of International Science and Engineering
Jack Thomison
Universidad Nacional Autónoma de México	IN109120, IN111913
Universidad Nacional Autónoma de México
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China	0855584
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China
Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica	80444
Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica
U.S. Department of Energy Office of Nuclear Physics	DE-AC05-00OR22725, DE-SC0008107, DE-FG02-03ER41258, DE-SC0014622

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.125.131803

Cite this

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

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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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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

Funding

ASJC Scopus subject areas

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