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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11 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
Jack Thomison
U.S. Department of Energy Office of Nuclear Physics	DE-AC05-00OR22725, DE-FG02-03ER41258, DE-SC0008107, DE-SC0014622
National Science Foundation	PHY-0855584
Directorate for Mathematical and Physical Sciences	0855584
Office of Science
Oak Ridge National Laboratory
Natural Sciences and Engineering Research Council of Canada
Canada Foundation for Innovation
Consejo Nacional de Ciencia y Tecnología	80444
Universidad Nacional Autónoma de México	IN109120, IN111913

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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",

language = "English",

volume = "125",

journal = "Physical Review Letters",

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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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AN - SCOPUS:85092802189

SN - 0031-9007

VL - 125

JO - Physical Review Letters

JF - Physical Review Letters

IS - 13

M1 - 131803

ER -

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

Abstract

Bibliographical note

Funding

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