# Effective Delayed Neutron (βeff)

**URL:** <https://openmc.discourse.group/t/effective-delayed-neutron-eff/312>\
**Category:** User Support\
**Created:** [March 17, 2018, 5:24pm UTC](https://openmc.discourse.group/t/effective-delayed-neutron-eff/312 "2018-03-17T17:24:44Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![paulromano](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/paulromano/32/486_2.png) [@paulromano](https://openmc.discourse.group/u/paulromano)\
**Post date:** [March 19, 2018, 12:01pm UTC](https://openmc.discourse.group/t/effective-delayed-neutron-eff/312/2 "2018-03-19T12:01:22Z")

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Hi Ahmed,

We currently do not have a built-in method for calculating beta-effective. There is an ongoing effort to implement methods for calculating adjoint-weighted quantities, so if and when that is finished, it should then be possible to calculate beta-effective. Keep an eye out for our future releases as more features are added.

Best,  
Paul

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