BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Development of non-destructive and depth-selective quantification 
 method of sub-percent carbon contents in steel by negative muon lifetime m
 easurement
DTSTART;VALUE=DATE-TIME:20220830T152000Z
DTEND;VALUE=DATE-TIME:20220830T170000Z
DTSTAMP;VALUE=DATE-TIME:20220826T120618Z
UID:indico-contribution-3875@indico.stfc.ac.uk
DESCRIPTION:Speakers: I-Huan Chiu (Osaka University)\nWhen a negatively ch
 arged muon stops in a material\, the muon makes muon atomic orbitals aroun
 d an atomic nucleus in the material. The muon orbiting its 1s orbital is a
 bsorbed into the nucleus with a mean lifetime depending on the atomic numb
 er of the nucleus (Z). This no-electron-emission process competes with the
  natural decay of the muon into an electron with a lifetime of 2.2 μs. Th
 e nuclear absorption rate becomes faster as Z increases. The apparent life
 time of the muons gets shorter with Z\; e. g. 2.0 μs in carbon and 0.20 
 μs in iron. It is possible to identify the element that captured a muon b
 y measuring the lifetime. A　compound's elemental composition can be non-
 destructively determined by measuring the electron lifetime spectrum. We h
 ave conducted a feasibility study on the non-destructive identification of
  carbon contents in steel (iron-containing carbon).\nThe muon experiment w
 as conducted at the D1 area of the Muon Science Establishment in the Japan
  Proton Accelerator Research Complex (J-PARC MUSE). The decay electrons we
 re measured by the large-solid angle plastic scintillation counter system 
 Kalliope for μSR. Standard steel samples with known carbon content were u
 sed for obtaining a calibration curve. A stacked steel sample consisting o
 f three steel plates with carbon contents of 0.51%\, 0.20% and 1.03 % of 0
 .5 mm in thickness was irradiated by three different muon beam momenta to 
 stop muons in the middle of each layer.\nThe lifetime spectrum was fitted 
 by four components\; iron\, carbon\, air (N\, O and Ar) and a long-lifetim
 e background. The carbon contents in the stacked sample determined by the 
 lifetime spectra agreed well with the known carbon contents in each steel 
 layer. In summary\, we successfully demonstrated the non-destructive and d
 epth-selective determination of sub-percent carbon contents in steel by mu
 on lifetime measurement.\n\nhttps://indico.stfc.ac.uk/event/53/contributio
 ns/3875/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3875/
END:VEVENT
END:VCALENDAR