Measurement of the neutron beta decay lifetime, an important parameter in the Standard Model and Big Bang nucleosynthesis, can be performed using two distinct experimental techniques. These two methods, known as the “beam” and “bottle” methods, disagree by 4$\sigma$. The leading beam neutron lifetime experiment requires a sub-0.1% precision measurement of the cold neutron beam flux, and the flux monitor used for this measurement is calibrated by the Alpha-Gamma device. The Alpha-Gamma device detects the products of neutron absorption on a totally absorbing $^{10}$B target to determine absolute neutron flux. This talk will cover the details of this technique as well as current and planned operations utilizing the Alpha-Gamma device.
