Alpha-Particle Ionization Yields in a Gridded Chamber

Herwig, Lloyd O.; Miller, Glenn H.

doi:10.1103/physrev.94.1183

Cited by 12 publications

(3 citation statements)

References 6 publications

(1 reference statement)

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“…Table II shows the experimental W-values of helium and xenon from present and past experiments. 14,[23][24][25][26][27][28] Table II indicates that the present W-values for helium and xenon are in good agreement with other experimental results, except for the results obtained by Bortner et al 24) within the uncertainty, even for different methodologies. This validates the accuracy of the W-values obtained through our system.…”

Section: Resultssupporting

confidence: 89%

“…The W-values of helium and xenon were experimentally determined to be =  W 42.8 1.6 eV He and =  W 21.3 0.4 eV, Xerespectively. The uncertainties were estimated from one sigma of the Gaussian fit of the pulse height distribution and the error in calibration of the number of electrons.TableIIshows the experimental W-values of helium and xenon from present and past experiments 14,[23][24][25][26][27][28]. TableIIindicates that the present W-values for helium and xenon are in good agreement with other experimental results, except for the results obtained by Bortner et al24) within the uncertainty, even for different methodologies.…”

supporting

confidence: 75%

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Scintillation and ionization yields of helium–xenon gas mixture for application in neutron detectors

Takeuchi

Saito

Kishimoto

et al. 2020

Jpn. J. Appl. Phys.

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The scintillation and ionization yields of helium–xenon gas mixture were measured using a gridded ionization chamber with 241Am alpha particles to study the potential of the mixture to be applied in neutron detectors. The ionization yields for various ratios of the mixture gases were obtained with gas pressures of 1.0, 0.657, and 0.100 MPa. The yield data were explained well using the ratio of the number of excited atoms to that of ionized atoms in helium, i.e. The scintillation yield increased with xenon partial pressure and saturated at 10% of the total pressure, while the ionization yield increased up to 1.59 times of the initial value for pure helium at 1% of the total pressure then gradually increased to 1.8 times. The helium gas with added xenon at 10% of its pressure was suggested as a medium of a neutron detector with signal readouts from both scintillation and ionization, since it increases the scintillation yield to more than 1.1 times of pure xenon and increases the ionization yield to more than increases 1.8 times of pure helium.

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Section: Resultssupporting

confidence: 89%

supporting

confidence: 75%

Scintillation and ionization yields of helium–xenon gas mixture for application in neutron detectors

Takeuchi

Saito

Kishimoto

et al. 2020

Jpn. J. Appl. Phys.

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“…The energy of such excited states also can be reradiated and may release photoelectrons from the chamber walls, as suggested by Hanna. 9 The search for slow components of these types, or of other as yet unidentified types, 11 was the task of the present work.…”

Section: Introductionmentioning

confidence: 99%

Search for a Slow Component in Alpha Ionization

Bay¹,

Pearlstein²

1963

Phys. Rev.

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Delayed ion production has been advanced as the reason for the difference in W (average energy expended in the creation of an ion pair) obtained by fast and slow collection of the ionization from alpha particles in gases. In order to determine whether such slow components exist, the slow and fast measuring methods are applied simultaneously to a single gridded chamber. The results in Ar, 90% Ar+10% CH 4 , and N 2 for alpha energies ranging from 1.5 to 4 MeV show that no such slow components exceeding the uncertainty of the measurements (<0.5%) are present. This indicates that (at least in the above cases) discrepancies between slow and fast methods in past measurements are not due to physical effects.

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