A modified area function in time scale for the transmission data analysis of neutron resonance

A modified area function in time scale has been constructed with the phosphorescent decay of the detector (long-optical modes) and the background fraction included. A coefficient in the modified area function called self-shielding parameter is established to indicate the self-shielding effect in the experiment. The modified area function is independent from the equipment resolution. For the thick sample (nσ0 ∼ 10), the self-shielding effect would greatly improve the sensitivity of the modified area function to the temperature. Theoretically, we discuss the properties of the modified area function and estimate the least temperature deviation for this area method in the temperature measurement. Procedure of temperature measurement from isolated or multiple resonances by using the modified area method is also suggested.