{
   "status_code":  200,
   "status_message": "OK",
   "request_timestamp":    "2026-09-22 02:39:19 PST",
   "request_url":    "https://pdglive.lbl.gov//api/listings/S017T",
   "edition":     "2026",
   "about":    "For further information see https://pdg.lbl.gov/api",
   "pdgid":       "S017T",
   "description": "n MEAN LIFE",
   "note": "Limits on lifetimes for bound neutrons are given in the section``p PARTIAL MEAN LIVES.''      We average eight of the best nine measurements, those made with ultracold neutrons (UCN's). If we include the one in-beam measurement with a comparable error (YUE 2013), we get 878.6+-0.6 s, where the scale factor is now 2.2.      For a recent discussion of the long-standing disagreement between in-beam and UCN results, see CZARNECKI 2018 (Physical Review Letters  120 202002 (2018)). For a full review of all matters concerning the neutron lifetime until about 2010, see WIETFELDT 2011, F.E. Wietfeldt and G.L. Greene, ``The neutron lifetime,'' Reviews of Modern Physics  83 1173 (2011).",
   "parent_pdgid": "S017",
   "parent_description": "n",
   "measurements":[ 
      {  
 "document_id": "MUSEDINOVIC 2025 "
, "publication_name": "PR C111 045501"
, "publication_year": 2025
, "doi": "10.1103/PhysRevC.111.045501"
, "inspire_id": "2826272"
, "title": "Measurement of the free neutron lifetime in a magneto-gravitational trap with in situ detection"
, "technique": "CNTR"
, "comment": "UCN magneto-gravit. trap"
, "is_changed": true
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 877.82
,   "error_positive": 0.2973213749463701
,   "error_negative": 0.2780287754891569
,   "stat_error_positive": 0.22
,   "stat_error_negative": 0.22
,   "syst_error_positive": 0.2
,   "syst_error_negative": 0.17
,   "value_text": "877.82 +-0.22 +0.20-0.17"
,   "unit": "s"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "877.82 +-0.22 +0.20-0.17"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 1
,   "text": "MUSEDINOVIC 2025 result is the average value of the previously published data of 2018 -- 2019 in GONZALEZ 2021 with the new 2020 -- 2022 data. The new data alone yields a value of 877.96+-0.37 s. GONZALEZ 2021 results are thus superseded."
,   "is_changed": true
      }  
]}
,
      {  
 "document_id": "EZHOV 2018 "
, "publication_name": "JETPL 107 671"
, "publication_year": 2018
, "doi": "10.1134/S0021364018110024"
, "inspire_id": "1335457"
, "title": "Measurement of the neutron lifetime with ultra-cold neutrons stored in a magneto-gravitational trap"
, "technique": "CNTR"
, "comment": "UCN magneto-gravit. trap"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 878.3
,   "error_positive": 1.886796226411321
,   "error_negative": 1.886796226411321
,   "stat_error_positive": 1.6
,   "stat_error_negative": 1.6
,   "syst_error_positive": 1.0
,   "syst_error_negative": 1.0
,   "value_text": "878.3 +-1.6 +-1.0"
,   "unit": "s"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "878.3 +-1.6 +-1.0"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "PATTIE 2018 "
, "publication_name": "SCI 360 627"
, "publication_year": 2018
, "doi": "10.1126/science.aan8895"
, "inspire_id": "1608886"
, "title": "Measurement of the neutron lifetime using a magneto-gravitational trap and in situ detection"
, "technique": "CNTR"
, "comment": "UCN asym. magnetic trap"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 877.7
,   "error_positive": 0.8062257748298549
,   "error_negative": 0.7280109889280517
,   "stat_error_positive": 0.7
,   "stat_error_negative": 0.7
,   "syst_error_positive": 0.4
,   "syst_error_negative": 0.2
,   "value_text": "877.7 +-0.7 +0.4-0.2"
,   "unit": "s"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "877.7 +-0.7 +0.4-0.2"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 2
,   "text": "PATTIE 2018 uses a new technique, with a semi-toroidal magneto-gravitational asymmetric trap and a novel in situ n-detector."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "SEREBROV 2018 "
, "publication_name": "PR C97 055503"
, "publication_year": 2018
, "doi": "10.1103/PhysRevC.97.055503"
, "inspire_id": "1643682"
, "title": "Neutron lifetime measurements with a large gravitational trap for ultracold neutrons"
, "technique": "CNTR"
, "comment": "UCN gravitational trap"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 881.5
,   "error_positive": 0.9219544457292886
,   "error_negative": 0.9219544457292886
,   "stat_error_positive": 0.7
,   "stat_error_negative": 0.7
,   "syst_error_positive": 0.6
,   "syst_error_negative": 0.6
,   "value_text": "881.5 +-0.7 +-0.6"
,   "unit": "s"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "881.5 +-0.7 +-0.6"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "ARZUMANOV 2015 "
, "publication_name": "PL B745 79"
, "publication_year": 2015
, "doi": "10.1016/j.physletb.2015.04.021"
, "inspire_id": "1364967"
, "title": "A Measurement of the Neutron Lifetime using the Method of Storage of Ultracold Neutrons and Detection of Inelastically up-Scattered Neutrons"
, "technique": "CNTR"
, "comment": "UCN double bottle"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 880.2
,   "error_positive": 1.2
,   "error_negative": 1.2
,   "value_text": "880.2 +-1.2"
,   "unit": "s"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "880.2 +-1.2"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 3
,   "text": "ARZUMANOV 2015 is a reanalysis of their 2008 -- 2010 dataset, with improved systematic corrections of of ARZUMANOV 2000 and ARZUMANOV 2012."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "STEYERL 2012 "
, "publication_name": "PR C85 065503"
, "publication_year": 2012
, "doi": "10.1103/PhysRevC.85.065503"
, "inspire_id": "1127450"
, "title": "Quasielastic Scattering in the Interaction of Ultracold Neutrons with a Liquid Wall and Application in a Reanalysis of the Mambo I Neutron-Lifetime Experiment"
, "technique": "CNTR"
, "comment": "UCN material bottle"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 882.5
,   "error_positive": 2.0518284528683193
,   "error_negative": 2.0518284528683193
,   "stat_error_positive": 1.4
,   "stat_error_negative": 1.4
,   "syst_error_positive": 1.5
,   "syst_error_negative": 1.5
,   "value_text": "882.5 +-1.4 +-1.5"
,   "unit": "s"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "882.5 +-1.4 +-1.5"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 4
,   "text": "STEYERL 2012 is a detailed reanalysis of neutron storage loss corrections to the raw data of MAMPE 1989, and it replaces that value."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "PICHLMAIER 2010 "
, "publication_name": "PL B693 221"
, "publication_year": 2010
, "doi": "10.1016/j.physletb.2010.08.032"
, "inspire_id": "873767"
, "title": "Neutron Lifetime Measurement with the UCN Trap-in-Trap MAMBO II"
, "technique": "CNTR"
, "comment": "UCN material bottle"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 880.7
,   "error_positive": 1.7691806012954132
,   "error_negative": 1.7691806012954132
,   "stat_error_positive": 1.3
,   "stat_error_negative": 1.3
,   "syst_error_positive": 1.2
,   "syst_error_negative": 1.2
,   "value_text": "880.7 +-1.3 +-1.2"
,   "unit": "s"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "880.7 +-1.3 +-1.2"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "SEREBROV 2005 "
, "publication_name": "PL B605 72"
, "publication_year": 2005
, "doi": "10.1016/j.physletb.2004.11.013"
, "inspire_id": "656144"
, "title": "Measurement of the Neutron Lifetime using a Gravitational Trap and a Low-Temperature Fomblin Coating"
, "technique": "CNTR"
, "comment": "UCN gravitational trap"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 878.5
,   "error_positive": 0.7615773105863908
,   "error_negative": 0.7615773105863908
,   "stat_error_positive": 0.7
,   "stat_error_negative": 0.7
,   "syst_error_positive": 0.3
,   "syst_error_negative": 0.3
,   "value_text": "878.5 +-0.7 +-0.3"
,   "unit": "s"
,   "used_in_average": true
,   "used_in_fit": true
,   "display_value_text": "878.5 +-0.7 +-0.3"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "GONZALEZ 2021 "
, "publication_name": "PRL 127 162501"
, "publication_year": 2021
, "doi": "10.1103/PhysRevLett.127.162501"
, "inspire_id": "1869487"
, "title": "Improved neutron lifetime measurement with UCN$tau$"
, "technique": "CNTR"
, "comment": "UCN asym. magnetic trap"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 877.75
,   "error_positive": 0.35608987629529715
,   "error_negative": 0.322490309931942
,   "stat_error_positive": 0.28
,   "stat_error_negative": 0.28
,   "syst_error_positive": 0.22
,   "syst_error_negative": 0.16
,   "value_text": "877.75 +-0.28 +0.22-0.16"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "877.75 +-0.28 +0.22-0.16"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 5
,   "text": "Superseded by MUSEDINOVIC 2025."
,   "is_changed": true
      }  
]}
,
      {  
 "document_id": "WILSON 2021 "
, "publication_name": "PR C104 045501"
, "publication_year": 2021
, "doi": "10.1103/PhysRevC.104.045501"
, "inspire_id": "1830258"
, "title": "Measurement of the free neutron lifetime using the neutron spectrometer on NASA's Lunar Prospector mission"
, "technique": "CNTR"
, "comment": "space-based n rate"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 887.0
,   "error_positive": 15.652475842498529
,   "error_negative": 14.317821063276353
,   "stat_error_positive": 14.0
,   "stat_error_negative": 14.0
,   "syst_error_positive": 7.0
,   "syst_error_negative": 3.0
,   "value_text": "887 +-14 +7-3"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "887 +-14 +7-3"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 6
,   "text": "WILSON 2021 extract the value from the flux of n escaping the moon using data from the Lunar Prospector Neutron Spectrometer."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "YUE 2013 "
, "publication_name": "PRL 111 222501"
, "publication_year": 2013
, "doi": "10.1103/PhysRevLett.111.222501"
, "inspire_id": "1253590"
, "title": "Improved Determination of the Neutron Lifetime"
, "technique": "CNTR"
, "comment": "In-beam n, trapped p"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 887.7
,   "error_positive": 2.247220505424423
,   "error_negative": 2.247220505424423
,   "stat_error_positive": 1.2
,   "stat_error_negative": 1.2
,   "syst_error_positive": 1.9
,   "syst_error_negative": 1.9
,   "value_text": "887.7 +-1.2 +-1.9"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "887.7 +-1.2 +-1.9"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 7
,   "text": "YUE 2013 differs from NICO 2005 in that a different and better method was used to measure the neutron density in the fiducial volume. This shifted the lifetime by +1.4 seconds and reduced the previously largest source of systematic uncertainty by a factor of five."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "ARZUMANOV 2012 "
, "publication_name": "JETPL 95 224"
, "publication_year": 2012
, "doi": "10.1134/S0021364012050025"
, "inspire_id": "1116789"
, "title": "Analysis and Correction of the Measurement of the Neutron Lifetime"
, "technique": "CNTR"
, "comment": "See ARZUMANOV 2015"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 881.6
,   "error_positive": 2.0615528128088303
,   "error_negative": 2.0615528128088303
,   "stat_error_positive": 0.8
,   "stat_error_negative": 0.8
,   "syst_error_positive": 1.9
,   "syst_error_negative": 1.9
,   "value_text": "881.6 +-0.8 +-1.9"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "881.6 +-0.8 +-1.9"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 8
,   "text": "ARZUMANOV 2012 reanalyzes its systematic corrections in ARZUMANOV 2000 and obtains this corrected value."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "NICO 2005 "
, "publication_name": "PR C71 055502"
, "publication_year": 2005
, "doi": "10.1103/PhysRevC.71.055502"
, "inspire_id": "665075"
, "title": "Measurement of the Neutron Lifetime by Counting Trapped Protons in a Cold Neutron Beam"
, "technique": "CNTR"
, "comment": "See YUE 2013"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 886.3
,   "error_positive": 3.417601498127013
,   "error_negative": 3.417601498127013
,   "stat_error_positive": 1.2
,   "stat_error_negative": 1.2
,   "syst_error_positive": 3.2
,   "syst_error_negative": 3.2
,   "value_text": "886.3 +-1.2 +-3.2"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "886.3 +-1.2 +-3.2"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "DEWEY 2003 "
, "publication_name": "PRL 91 152302"
, "publication_year": 2003
, "doi": "10.1103/PhysRevLett.91.152302"
, "inspire_id": "632446"
, "title": "Measurement of the Neutron Lifetime Using a Proton Trap"
, "technique": "CNTR"
, "comment": "See NICO 2005"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 886.8
,   "error_positive": 3.417601498127013
,   "error_negative": 3.417601498127013
,   "stat_error_positive": 1.2
,   "stat_error_negative": 1.2
,   "syst_error_positive": 3.2
,   "syst_error_negative": 3.2
,   "value_text": "886.8 +-1.2 +-3.2"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "886.8 +-1.2 +-3.2"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "ARZUMANOV 2000 "
, "publication_name": "PL B483 15"
, "publication_year": 2000
, "doi": "10.1016/S0370-2693(00)00579-7"
, "inspire_id": "526530"
, "title": "Neutron Life Time Value Measured by Storing Ultracold Neutrons with Detection of Inelastically Scattering Neutrons"
, "technique": "CNTR"
, "comment": "See ARZUMANOV 2012"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 885.4
,   "error_positive": 0.9848857801796105
,   "error_negative": 0.9848857801796105
,   "stat_error_positive": 0.9
,   "stat_error_negative": 0.9
,   "syst_error_positive": 0.4
,   "syst_error_negative": 0.4
,   "value_text": "885.4 +-0.9 +-0.4"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "885.4 +-0.9 +-0.4"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "BYRNE 1996 "
, "publication_name": "EPL 33 187"
, "publication_year": 1996
, "doi": "10.1209/epl/i1996-00319-x"
, "inspire_id": "439340"
, "title": "A Revised Value for the Neutron Lifetime Measured Using a Penning Trap"
, "technique": "CNTR"
, "comment": "Penning trap"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 889.2
,   "error_positive": 4.841487374764082
,   "error_negative": 4.841487374764082
,   "stat_error_positive": 3.0
,   "stat_error_negative": 3.0
,   "syst_error_positive": 3.8
,   "syst_error_negative": 3.8
,   "value_text": "889.2 +-3.0 +-3.8"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "889.2 +-3.0 +-3.8"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "MAMPE 1993 "
, "publication_name": "JETPL 57 82"
, "publication_year": 1993
, "inspire_id": "362243"
, "title": "Measurement of the Lifetime of Neutron by Means of Keeping of UCN with Registration of Inelastically Scattered Neutrons"
, "technique": "CNTR"
, "comment": "UCN material bottle"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 882.6
,   "error_positive": 2.7
,   "error_negative": 2.7
,   "value_text": "882.6 +-2.7"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "882.6 +-2.7"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 9
,   "text": "IGNATOVICH 1995 calls into question some of the corrections and averaging procedures used by MAMPE 1993. The response, BONDARENKO 1996, denies the validity of the criticisms."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "NESVIZHEVSKII 1992 "
, "publication_name": "JETP 75 405"
, "publication_year": 1992
, "inspire_id": "346975"
, "title": "Result of the Neutron Lifetime Measurement in the Gravitational Trap Experiment and Analysis of the Experimental Errors"
, "technique": "CNTR"
, "comment": "UCN material bottle"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 888.4
,   "error_positive": 3.2893768406797057
,   "error_negative": 3.2893768406797057
,   "stat_error_positive": 3.1
,   "stat_error_negative": 3.1
,   "syst_error_positive": 1.1
,   "syst_error_negative": 1.1
,   "value_text": "888.4 +-3.1 +-1.1"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "888.4 +-3.1 +-1.1"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 10
,   "text": "The NESVIZHEVSKII 1992 measurement has been withdrawn by A. Serebrov."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "ALFIMENKOV 1990 "
, "publication_name": "JETPL 52 373"
, "publication_year": 1990
, "inspire_id": "302676"
, "title": "Results of Neutron Lifetime Measurements with Gravitational UCN Trap"
, "technique": "CNTR"
, "comment": "See NESVIZHEVSKII 1992"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 888.4
,   "error_positive": 2.9
,   "error_negative": 2.9
,   "value_text": "888.4 +-2.9"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "888.4 +-2.9"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "BYRNE 1990 "
, "publication_name": "PRL 65 289"
, "publication_year": 1990
, "doi": "10.1103/PhysRevLett.65.289"
, "inspire_id": "303584"
, "title": "Measurement of the Neutron Lifetime by Counting Trapped Protons"
, "technique": "CNTR"
, "comment": "See BYRNE 1996"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 893.6
,   "error_positive": 5.303772242470448
,   "error_negative": 5.303772242470448
,   "stat_error_positive": 3.8
,   "stat_error_negative": 3.8
,   "syst_error_positive": 3.7
,   "syst_error_negative": 3.7
,   "value_text": "893.6 +-3.8 +-3.7"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "893.6 +-3.8 +-3.7"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "KOSSAKOWSKI 1989 "
, "publication_name": "NP A503 473"
, "publication_year": 1989
, "doi": "10.1016/0375-9474(89)90246-7"
, "inspire_id": "287474"
, "title": "Neutron Lifetime Measurement with a Helium-Filled Time Projection Chamber"
, "technique": "TPC"
, "comment": "Pulsed beam"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 878.0
,   "error_positive": 30.4138126514911
,   "error_negative": 30.4138126514911
,   "stat_error_positive": 27.0
,   "stat_error_negative": 27.0
,   "syst_error_positive": 14.0
,   "syst_error_negative": 14.0
,   "value_text": "878 +-27 +-14"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "878 +-27 +-14"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "MAMPE 1989 "
, "publication_name": "PRL 63 593"
, "publication_year": 1989
, "doi": "10.1103/PhysRevLett.63.593"
, "inspire_id": "285386"
, "title": "Neutron Lifetime Measured with Stored Ultracold Neutrons"
, "technique": "CNTR"
, "comment": "See STEYERL 2012"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 887.6
,   "error_positive": 3.0
,   "error_negative": 3.0
,   "value_text": "887.6 +-3.0"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "887.6 +-3.0"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "PAUL 1989 "
, "publication_name": "ZPHY C45 25"
, "publication_year": 1989
, "doi": "10.1007/BF01556667"
, "inspire_id": "279731"
, "title": "Measurement of the Neutron Lifetime in a Magnetic Storage Ring"
, "technique": "CNTR"
, "comment": "Magnetic storage ring"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 877.0
,   "error_positive": 10.0
,   "error_negative": 10.0
,   "value_text": "877 +-10"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "877 +-10"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "LAST 1988 "
, "publication_name": "PRL 60 995"
, "publication_year": 1988
, "doi": "10.1103/PhysRevLett.60.995"
, "inspire_id": "264163"
, "title": "Pulsed Beam Neutron Lifetime Measurement"
, "technique": "SPEC"
, "comment": "Pulsed beam"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 876.0
,   "error_positive": 21.470910553583888
,   "error_negative": 21.470910553583888
,   "stat_error_positive": 10.0
,   "stat_error_negative": 10.0
,   "syst_error_positive": 19.0
,   "syst_error_negative": 19.0
,   "value_text": "876 +-10 +-19"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "876 +-10 +-19"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "SPIVAK 1988 "
, "publication_name": "JETP 67 1735"
, "publication_year": 1988
, "inspire_id": "276472"
, "title": "Neutron Lifetime in KIAE Experiment"
, "technique": "CNTR"
, "comment": "Beam"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 891.0
,   "error_positive": 9.0
,   "error_negative": 9.0
,   "value_text": "891 +-9"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "891 +-9"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "KOSVINTSEV 1986 "
, "publication_name": "JETPL 44 571"
, "publication_year": 1986
, "inspire_id": "240819"
, "title": "The Measurement of the Neutron's Life Time by Ultracold Neutron Save Method"
, "technique": "CNTR"
, "comment": "UCN material bottle"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 903.0
,   "error_positive": 13.0
,   "error_negative": 13.0
,   "value_text": "903 +-13"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "903 +-13"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "BYRNE 1980 "
, "publication_name": "PL 92B 274"
, "publication_year": 1980
, "doi": "10.1016/0370-2693(80)90262-2"
, "inspire_id": "158165"
, "title": "A New Measurement of the Neutron Lifetime"
, "technique": "CNTR"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 937.0
,   "error_positive": 18.0
,   "error_negative": 18.0
,   "value_text": "937 +-18"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "937 +-18"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
,   "footnotes":[ 
      {  
   "index": 11
,   "text": "The BYRNE 1980 measurement has been withdrawn (J. Byrne, private communication, 1990)."
,   "is_changed": false
      }  
]}
,
      {  
 "document_id": "KOSVINTSEV 1980 "
, "publication_name": "JETPL 31 236"
, "publication_year": 1980
, "inspire_id": "157268"
, "title": "Application of Ultracold Neutrons for Neutron Lifetime Measurement"
, "technique": "CNTR"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 875.0
,   "error_positive": 95.0
,   "error_negative": 95.0
,   "value_text": "875 +-95"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "875 +-95"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "BONDARENKO 1978 "
, "publication_name": "JETPL 28 303"
, "publication_year": 1978
, "inspire_id": "135939"
, "title": "Measurement of Neutron Halflife"
, "technique": "CNTR"
, "comment": "See SPIVAK 1988"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 881.0
,   "error_positive": 8.0
,   "error_negative": 8.0
,   "value_text": "881 +-8"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "881 +-8"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 },
      {  
 "document_id": "CHRISTENSEN 1972 "
, "publication_name": "PR D5 1628"
, "publication_year": 1972
, "doi": "10.1103/PhysRevD.5.1628"
, "inspire_id": "79381"
, "title": "Free Neutron beta Decay Halflife"
, "technique": "CNTR"
, "is_changed": false
,   "measurement_values":[ 
      {  
   "column_name": "VALUE"
,   "value": 918.0
,   "error_positive": 14.0
,   "error_negative": 14.0
,   "value_text": "918 +-14"
,   "unit": "s"
,   "used_in_average": false
,   "used_in_fit": false
,   "display_value_text": "918 +-14"
,   "display_power_of_ten": 0
,   "display_in_percent": false
 }
   ]
 }
   ]
}