{
   "status_code":  200,
   "status_message": "OK",
   "request_timestamp":    "2026-09-22 07:21:21 PST",
   "request_url":    "https://pdglive.lbl.gov//api/listings/S017AV",
   "edition":     "2026",
   "about":    "For further information see https://pdg.lbl.gov/api",
   "pdgid":       "S017AV",
   "description": "lambda==electron g-factor(A) / electron g-factor(V)",
   "note": "In the Standard Model lambda==g(A)/g(V) is related to parameter a, e-nubar_{{e}} angular correlation coefficient, by a = (1 - lambda**2) / (1 + 3lambda**2); this assumes that g(A) and  g(V) are real. The relationship between a and lambda is further  modified once recoil corrections are included, see WIETFELDT 2024.",
   "parent_pdgid": "S017",
   "parent_description": "n",
   "measurements":[ 
      {  
 "document_id": "WIETFELDT 2024 "
, "publication_name": "PR C110 015502"
, "publication_year": 2024
, "doi": "10.1103/PhysRevC.110.015502"
, "inspire_id": "2672260"
, "title": "Recoil-Order and Radiative Corrections to the aCORN Experiment"
, "technique": "SPEC"
, "comment": "Cold n, unpolarized"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.2712
,   "error_positive": 0.0061
,   "error_negative": 0.0061
,   "value_text": "-1.2712 +-0.0061"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "-1.2712 +-0.0061"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 1
,   "text": "WIETFELDT 2024 updates HASSAN 2021, see footnote to HASSAN 2021. The value is extracted from the angular correlation coefficient."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "BECK 2020 "
, "publication_name": "PR C101 055506"
, "publication_year": 2020
, "doi": "10.1103/PhysRevC.101.055506"
, "inspire_id": "1749576"
, "title": "Improved determination of the $beta$-$overline{nu}_e$ angular correlation coefficient $a$ in free neutron decay with the $aSPECT$ spectrometer"
, "technique": "SPEC"
, "comment": "Proton recoil spectrum"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.2677
,   "error_positive": 0.0028
,   "error_negative": 0.0028
,   "value_text": "-1.2677 +-0.0028"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "-1.2677 +-0.0028"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 2
,   "text": "BECK 2020 calculates this value from the measurement of the beta-decay e-nubar_{{e}} angular correlation coefficient a."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "MAERKISCH 2019 "
, "publication_name": "PRL 122 242501"
, "publication_year": 2019
, "doi": "10.1103/PhysRevLett.122.242501"
, "inspire_id": "1708714"
, "title": "Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam"
, "technique": "SPEC"
, "comment": "pulsed cold n, polarized"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.27641
,   "error_positive": 5.580322571321482E-4
,   "error_negative": 5.580322571321482E-4
,   "stat_error_positive": 4.5E-4
,   "stat_error_negative": 4.5E-4
,   "syst_error_positive": 3.3E-4
,   "syst_error_negative": 3.3E-4
,   "value_text": "-1.27641 +-0.00045 +-0.00033"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "-1.27641 +-0.00045 +-0.00033"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 3
,   "text": "MAERKISCH 2019 gets A = -0.11985+-0.00017+-0.00012."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "BROWN 2018 "
, "publication_name": "PR C97 035505"
, "publication_year": 2018
, "doi": "10.1103/PhysRevC.97.035505"
, "inspire_id": "1640692"
, "title": "New result for the neutron $beta$-asymmetry parameter $A_0$ from UCNA"
, "technique": "UCNA"
, "comment": "Ultracold n, polarized"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.2772
,   "error_positive": 0.002
,   "error_negative": 0.002
,   "value_text": "-1.2772 +-0.0020"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "-1.2772 +-0.0020"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 4
,   "text": "BROWN 2018 gets A = -0.12054+-0.00044+-0.00068 and lambda = -1.2783+-0.0022. We quote the combined values that include the earlier UCNA measurements (MENDENHALL 2013)."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "MUND 2013 "
, "publication_name": "PRL 110 172502"
, "publication_year": 2013
, "doi": "10.1103/PhysRevLett.110.172502"
, "inspire_id": "1097109"
, "title": "Determination of the Weak Axial Vector Coupling lambda = g(A)/g(V) from a Measurement of the beta-Asymmetry Parameter A in Neutron Beta Decay"
, "technique": "SPEC"
, "comment": "Cold n, polarized"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.2748
,   "error_positive": 0.0012806248474865698
,   "error_negative": 0.0013601470508735444
,   "stat_error_positive": 8.0E-4
,   "stat_error_negative": 8.0E-4
,   "syst_error_positive": 0.001
,   "syst_error_negative": 0.0011
,   "value_text": "-1.2748 +-0.0008 +0.0010-0.0011"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "-1.2748 +-0.0008 +0.0010-0.0011"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 5
,   "text": "This MUND 2013 value includes earlier PERKEO II measurements (ABELE 2002 and ABELE 1997D)."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "SCHUMANN 2008 "
, "publication_name": "PRL 100 151801"
, "publication_year": 2008
, "doi": "10.1103/PhysRevLett.100.151801"
, "inspire_id": "770550"
, "title": "Measurement of the Proton Asymmetry Parameter in Neutron Beta Decay"
, "technique": "CNTR"
, "comment": "Cold n, polarized"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.275
,   "error_positive": 0.016155494421403512
,   "error_negative": 0.016155494421403512
,   "stat_error_positive": 0.006
,   "stat_error_negative": 0.006
,   "syst_error_positive": 0.015
,   "syst_error_negative": 0.015
,   "value_text": "-1.275 +-0.006 +-0.015"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "-1.275 +-0.006 +-0.015"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "MOSTOVOI 2001 "
, "publication_name": "PAN 64 1955"
, "publication_year": 2001
, "doi": "10.1134/1.1423745"
, "inspire_id": "571153"
, "title": "Experimental Value of G(a)/G(v) from a Measurement of Both P-odd Correlations in Free-neutron Decay"
, "technique": "CNTR"
, "comment": "A and B x polarizations"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.2686
,   "error_positive": 0.0046529560496527365
,   "error_negative": 0.0046529560496527365
,   "stat_error_positive": 0.0046
,   "stat_error_negative": 0.0046
,   "syst_error_positive": 7.0E-4
,   "syst_error_negative": 7.0E-4
,   "value_text": "-1.2686 +-0.0046 +-0.0007"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "-1.2686 +-0.0046 +-0.0007"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 6
,   "text": "MOSTOVOI 2001 measures the two P-odd correlations A and B, or rather SA and SB, where S is the n polarization, in free neutron decay."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "LIAUD 1997 "
, "publication_name": "NP A612 53"
, "publication_year": 1997
, "doi": "10.1016/S0375-9474(96)00325-9"
, "inspire_id": "454664"
, "title": "The Measurement of the beta Asymmetry in the Decay of Polarized Neutrons"
, "technique": "TPC"
, "comment": "Cold n, polarized, A"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.266
,   "error_positive": 0.004
,   "error_negative": 0.004
,   "value_text": "-1.266 +-0.004"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "-1.266 +-0.004"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "YEROZOLIMSKY 1997 "
, "publication_name": "PL B412 240"
, "publication_year": 1997
, "doi": "10.1016/S0370-2693(97)01004-6"
, "inspire_id": "459719"
, "title": "Corrigendum: Corrected Value of the beta Emission Asymmetry in the Decay of Polarized Neutrons Measured in 1990"
, "technique": "CNTR"
, "comment": "Cold n, polarized, A"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.2594
,   "error_positive": 0.0038
,   "error_negative": 0.0038
,   "value_text": "-1.2594 +-0.0038"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "-1.2594 +-0.0038"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 7
,   "text": "YEROZOLIMSKY 1997 makes a correction to the EROZOLIMSKII 1991 value."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "BOPP 1986 "
, "publication_name": "PRL 56 919"
, "publication_year": 1986
, "doi": "10.1103/PhysRevLett.56.919"
, "inspire_id": "17990"
, "title": "The beta Decay Asymmetry of the Neutron and g(a)/g(v)"
, "technique": "SPEC"
, "comment": "Cold n, polarized, A"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.262
,   "error_positive": 0.005
,   "error_negative": 0.005
,   "value_text": "-1.262 +-0.005"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "-1.262 +-0.005"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "HASSAN 2021 "
, "publication_name": "PR C103 045502"
, "publication_year": 2021
, "doi": "10.1103/PhysRevC.103.045502"
, "inspire_id": "1838479"
, "title": "Measurement of the neutron decay electron-antineutrino angular correlation by the aCORN experiment"
, "technique": "SPEC"
, "comment": "Cold n, unpolarized"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.2796
,   "error_positive": 0.0062
,   "error_negative": 0.0062
,   "value_text": "-1.2796 +-0.0062"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.2796 +-0.0062"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 8
,   "text": "HASSAN 2021 include earlier data of DARIUS 2017. The value is extracted from the angular correlation coefficient a."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "SAUL 2020 "
, "publication_name": "PRL 125 112501"
, "publication_year": 2020
, "doi": "10.1103/PhysRevLett.125.112501"
, "inspire_id": "1763101"
, "title": "Limit on the Fierz Interference Term b from a Measurement of the Beta Asymmetry in Neutron Decay"
, "technique": "SPEC"
, "comment": "Cold n, polarized, A"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.27607
,   "error_positive": 6.8E-4
,   "error_negative": 6.8E-4
,   "value_text": "-1.27607 +-0.00068"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.27607 +-0.00068"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 9
,   "text": "SAUL 2020 quote this value of lambda under the SM assumption of the Fierz term b = 0. In a combined fit authors extract a value of lambda = -1.2792+-0.0060."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "DARIUS 2017 "
, "publication_name": "PRL 119 042502"
, "publication_year": 2017
, "doi": "10.1103/PhysRevLett.119.042502"
, "inspire_id": "1613729"
, "title": "Measurement of the Electron-Antineutrino Angular Correlation in Neutron beta Decay"
, "technique": "SPEC"
, "comment": "Cold n, unpolarized"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.284
,   "error_positive": 0.014
,   "error_negative": 0.014
,   "value_text": "-1.284 +-0.014"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.284 +-0.014"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 10
,   "text": "DARIUS 2017 calculates this value from the measurement of the a parameter (see  below). Data is included in HASSAN 2021."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "MENDENHALL 2013 "
, "publication_name": "PR C87 032501"
, "publication_year": 2013
, "doi": "10.1103/PhysRevC.87.032501"
, "inspire_id": "1193801"
, "title": "Precision Measurement of the Neutron Beta-Decay Asymmetry"
, "technique": "UCNA"
, "comment": "See BROWN 2018"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.2755
,   "error_positive": 0.003
,   "error_negative": 0.003
,   "value_text": "-1.2755 +-0.0030"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.2755 +-0.0030"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 11
,   "text": "MENDENHALL 2013 gets A = -0.11954+-0.00055+-0.00098 and lambda = -1.2756+-0.0030. We quote the nearly identical values that include the earlier UCNA measurement (PLASTER 2012), with a correction to that result."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "PLASTER 2012 "
, "publication_name": "PR C86 055501"
, "publication_year": 2012
, "doi": "10.1103/PhysRevC.86.055501"
, "inspire_id": "1123827"
, "title": "Measurement of the Neutron beta-Asymmetry Parameter A0 with Ultracold Neutrons"
, "technique": "UCNA"
, "comment": "See MENDENHALL 2013"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.2759
,   "error_positive": 0.004082670694533176
,   "error_negative": 0.004463742824133129
,   "stat_error_positive": 0.00239
,   "stat_error_negative": 0.00239
,   "syst_error_positive": 0.00331
,   "syst_error_negative": 0.00377
,   "value_text": "-1.27590 +-0.00239 +0.00331-0.00377"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.27590 +-0.00239 +0.00331-0.00377"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 12
,   "text": "This PLASTER 2012 value is identical with that given in LIU 2010, but the experiment is now described in detail."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "LIU 2010 "
, "publication_name": "PRL 105 181803"
, "publication_year": 2010
, "doi": "10.1103/PhysRevLett.105.181803"
, "inspire_id": "862258"
, "title": "Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons"
, "technique": "UCNA"
, "comment": "See PLASTER 2012"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.2759
,   "error_positive": 0.00409
,   "error_negative": 0.00445
,   "value_text": "-1.27590 +0.00409-0.00445"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.27590 +0.00409-0.00445"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "ABELE 2002 "
, "publication_name": "PRL 88 211801"
, "publication_year": 2002
, "doi": "10.1103/PhysRevLett.88.211801"
, "inspire_id": "589042"
, "title": "Is the Unitarity of the Quark Mixing CKM Matrix Violated in Neutron beta Decay?"
, "technique": "SPEC"
, "comment": "See MUND 2013"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.2739
,   "error_positive": 0.0019
,   "error_negative": 0.0019
,   "value_text": "-1.2739 +-0.0019"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.2739 +-0.0019"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 13
,   "text": "This is the combined result of ABELE 2002 and ABELE 1997D."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "ABELE 1997D"
, "publication_name": "PL B407 212"
, "publication_year": 1997
, "doi": "10.1016/S0370-2693(97)00739-9"
, "inspire_id": "458352"
, "title": "A Measurement of the beta Asymmetry A in the Decay of Free Neutrons"
, "technique": "SPEC"
, "comment": "Cold n, polarized, A"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.274
,   "error_positive": 0.003
,   "error_negative": 0.003
,   "value_text": "-1.274 +-0.003"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.274 +-0.003"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "SCHRECKENBACH 1995 "
, "publication_name": "PL B349 427"
, "publication_year": 1995
, "doi": "10.1016/0370-2693(95)00228-D"
, "inspire_id": "404652"
, "title": "A New Measurements of the beta Emission Asymmetry in Free Decay of Polarized Neutrons"
, "technique": "TPC"
, "comment": "See LIAUD 1997"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.266
,   "error_positive": 0.004
,   "error_negative": 0.004
,   "value_text": "-1.266 +-0.004"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.266 +-0.004"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "EROZOLIMSKII 1991 "
, "publication_name": "PL B263 33"
, "publication_year": 1991
, "doi": "10.1016/0370-2693(91)91703-X"
, "inspire_id": "301077"
, "title": "New Measurement of the Electron Neutron Spin Asymmetry in Neutron beta Decay"
, "technique": "CNTR"
, "comment": "See YEROZOLIMSKY 1997"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.2544
,   "error_positive": 0.0036
,   "error_negative": 0.0036
,   "value_text": "-1.2544 +-0.0036"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.2544 +-0.0036"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "MOSTOVOY 1983 "
, "publication_name": "JETPL 37 196"
, "publication_year": 1983
, "inspire_id": "195075"
, "title": "Determination of G(A)/G(V) from the Set of Three Angular Correlation Coefficients Observed in the Decay of the Free Neutron"
, "technique": "RVUE"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.226
,   "error_positive": 0.042
,   "error_negative": 0.042
,   "value_text": "-1.226 +-0.042"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.226 +-0.042"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "EROZOLIMSKII 1979 "
, "publication_name": "SJNP 30 356"
, "publication_year": 1979
, "inspire_id": "147568"
, "title": "Measurement of the Spin Electron Correlation Coefficient in the Decay of Polarized Neutrons and the Determination of the g(a)/g(v) Ratio"
, "technique": "CNTR"
, "comment": "Cold n, polarized, A"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.261
,   "error_positive": 0.012
,   "error_negative": 0.012
,   "value_text": "-1.261 +-0.012"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.261 +-0.012"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "STRATOWA 1978 "
, "publication_name": "PR D18 3970"
, "publication_year": 1978
, "doi": "10.1103/PhysRevD.18.3970"
, "inspire_id": "137207"
, "title": "Ratio |g(A)/g(V)| Derived from the Proton Spectrum in Free Neutron Decay"
, "technique": "CNTR"
, "comment": "p recoil spectrum, a"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.259
,   "error_positive": 0.017
,   "error_negative": 0.017
,   "value_text": "-1.259 +-0.017"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.259 +-0.017"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 14
,   "text": "These experiments measure the absolute value of electron gfactor(A)/electron gfactor(V) only."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "EROZOLIMSKII 1977 "
, "publication_name": "JETPL 23 663"
, "publication_year": 1977
, "inspire_id": "114475"
, "title": "New Measurements of Spin Electron Angular Correlation in Polarized Neutron Decay"
, "technique": "CNTR"
, "comment": "See EROZOLIMSKII 1979"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.263
,   "error_positive": 0.015
,   "error_negative": 0.015
,   "value_text": "-1.263 +-0.015"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.263 +-0.015"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "DOBROZEMSKY 1975 "
, "publication_name": "PR D11 510"
, "publication_year": 1975
, "doi": "10.1103/PhysRevD.11.510"
, "inspire_id": "107225"
, "title": "nubar_{{e}} Angular Correlation Coefficient as Measured from Free Neutron Decay"
, "technique": "CNTR"
, "comment": "See STRATOWA 1978"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.25
,   "error_positive": 0.036
,   "error_negative": 0.036
,   "value_text": "-1.250 +-0.036"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.250 +-0.036"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 14
,   "text": "These experiments measure the absolute value of electron gfactor(A)/electron gfactor(V) only."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "KROHN 1975 "
, "publication_name": "PL 55B 175"
, "publication_year": 1975
, "doi": "10.1016/0370-2693(75)90436-0"
, "inspire_id": "108007"
, "title": "G(A)/G(V) Measured in the Decay of Polarized Neutrons"
, "technique": "CNTR"
, "comment": "Cold n, polarized, A"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.258
,   "error_positive": 0.015
,   "error_negative": 0.015
,   "value_text": "-1.258 +-0.015"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.258 +-0.015"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 15
,   "text": "KROHN 1975 includes events of CHRISTENSEN 1970."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "KROPF 1974 "
, "publication_name": "ZPHY 267 129"
, "publication_year": 1974
, "doi": "10.1007/BF01668639"
, "inspire_id": "98130"
, "title": "Least Squares Adjustment of the Coupling Constants in Nuclear beta-Decay"
, "technique": "RVUE"
, "comment": "n decay alone"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.263
,   "error_positive": 0.016
,   "error_negative": 0.016
,   "value_text": "-1.263 +-0.016"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.263 +-0.016"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 16
,   "text": "KROPF 1974 reviews all data through 1972."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "KROPF 1974 "
, "publication_name": "ZPHY 267 129"
, "publication_year": 1974
, "doi": "10.1007/BF01668639"
, "inspire_id": "98130"
, "title": "Least Squares Adjustment of the Coupling Constants in Nuclear beta-Decay"
, "technique": "RVUE"
, "comment": "n decay + nuclear ft"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": -1.25
,   "error_positive": 0.009
,   "error_negative": 0.009
,   "value_text": "-1.250 +-0.009"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "-1.250 +-0.009"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 16
,   "text": "KROPF 1974 reviews all data through 1972."
,   "is_changed": false
      }  
]}

   ]
}