update nuclear-data.ipynb
update nuclear-data.ipynb

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