Fix temperature derivative denominator
Fix temperature derivative denominator

shikhar413/openmc,smharper/openmc,paulromano/openmc,walshjon/openmc,mit-crpg/openmc,amandalund/openmc,johnnyliu27/openmc,smharper/openmc,johnnyliu27/openmc,paulromano/openmc,amandalund/openmc,liangjg/openmc,wbinventor/openmc,amandalund/openmc,wbinventor/openmc,liangjg/openmc,johnnyliu27/openmc,bhermanmit/openmc,wbinventor/openmc,smharper/openmc,shikhar413/openmc,shikhar413/openmc,shikhar413/openmc,smharper/openmc,mit-crpg/openmc,amandalund/openmc,liangjg/openmc,liangjg/openmc,walshjon/openmc,walshjon/openmc,mit-crpg/openmc,walshjon/openmc,johnnyliu27/openmc,bhermanmit/openmc,paulromano/openmc,wbinventor/openmc,mit-crpg/openmc,paulromano/openmc