Editing Neutron emission (section)

==Photoneutron emission==
{{Main|Photodisintegration}}
Some nuclides can be induced to eject a neutron by [[gamma radiation]]. One such nuclide is [[beryllium-9|<sup>9</sup>Be]]; its photodisintegration is significant in nuclear astrophysics, pertaining to the abundance of beryllium and the consequences of the instability of [[beryllium-8|<sup>8</sup>Be]]. This also makes this isotope useful as a neutron source in nuclear reactors.<ref name="9Ber">{{cite journal |last1=Odsuren |first1=M. |last2=Katō |first2=K. |last3=Kikuchi |first3=Y. |last4=Aikawa |first4=M. |last5=Myo |first5=T. |title=A resonance problem on the low-lying resonant state in the 9Be system |journal=Journal of Physics: Conference Series |date=2014 |volume=569 |issue=1 |page=012072 |doi=10.1088/1742-6596/569/1/012072 |bibcode=2014JPhCS.569a2072O |url=http://inspirehep.net/record/1333594/files/1742-6596_569_1_012072.pdf|doi-access=free }}</ref> Another nuclide, [[tantalum-181|<sup>181</sup>Ta]], is also known to be readily capable of photodisintegration; this process is thought to be responsible for the creation of [[tantalum-180m|<sup>180m</sup>Ta]], the only primordial [[nuclear isomer]] and the rarest [[primordial nuclide]].<ref>{{cite journal |last1=Utsonomiya |first1=H. |last2=Akimune |first2=H. |last3=Goko |first3=S. |last4=Yamagata |first4=T. |last5=Ohta |first5=M. |last6=Ohgaki |first6=H. |last7=Toyokawa |first7=H. |last8=Sumiyoshi |first8=K. |last9=Lui |first9=Y.-W. |title=Photoneutron Cross Sections for Nuclear Astrophysics |journal=Journal of Nuclear Science and Technology |volume=Supplement 2 |pages=542–545 |date=2002 |doi=10.1080/00223131.2002.10875158 |bibcode=2002JNST...39S.542U |s2cid=124167982 }}</ref>