Is there a pulse height defect for methane?
In a recent investigation of the spontaneous fission of 252Cf using a twin ionisation chamber with Frisch grids and methane (CH(4)) as the counter gas, the mean values for the fission fragment parameters did not agree with literature values if no pulse height defect (PHD) was taken into account. Measurements with two different counting gases, 90 % Ar + 10 % CH(4) and CH(4) have been conducted at gas pressures of 0.6 x 1.0 E5 Pa and 1.2 x 1.0 E5 Pa to solve this inconsistency. The higher pressure enabled an absolute energy calibration using the alpha-activity of the 252Cf-sample. The absolute calibration yielded a mean total kinetic energy (TKE) of only 179.1 MeV, which is lower than the recommended value of 184.1 MeV.
Bibliographic Reference: Paper presented: Workshop on Nuclear Fission and Fission Product Spectroscopy, Seyssins (FR), May 2-4, 1994
Availability: Available from (1) as Paper EN 38185 ORA
Record Number: 199410551 / Last updated on: 1994-11-28
Original language: en
Available languages: en