Now, Neutron Lifetime had been measured by two different method. But there is a considerable gap in these two observation results.

Then, we measure Neutron Lifrtime day-to-day by Electron Counting method that differs from these two methods, aiming to the accuracy 0.1% observation.

Electron Counting method is that we measure the neutron flux by

We can evaluate Netron Lifetime by the function.

But we know that the current appratus cannot perform the accuracy 0.1% measurement, so we plan to increase the incident beam intensity to improve the statistical acuracy.