Editing Neutron (section)

=== Dineutrons and tetraneutrons ===
{{Main|Dineutron|Tetraneutron}}

The [[dineutron]] is considered component in neutron-rich <sup>16</sup>Be nuclei<ref>{{Cite journal |last1=Monteagudo |first1=B. |last2=Marqués |first2=F. M. |last3=Gibelin |first3=J. |last4=Orr |first4=N. A. |last5=Corsi |first5=A. |last6=Kubota |first6=Y. |last7=Casal |first7=J. |last8=Gómez-Camacho |first8=J. |last9=Authelet |first9=G. |last10=Baba |first10=H. |last11=Caesar |first11=C. |last12=Calvet |first12=D. |last13=Delbart |first13=A. |last14=Dozono |first14=M. |last15=Feng |first15=J. |date=2024-02-23 |title=Mass, Spectroscopy, and Two-Neutron Decay of $^{16}\mathrm{Be}$ |url=https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.132.082501 |journal=Physical Review Letters |volume=132 |issue=8 |pages=082501 |doi=10.1103/PhysRevLett.132.082501|pmid=38457706 }}</ref> and an  unbound state  with lifetimes less than 10<sup>−22</sup> seconds. The first evidence for this state was reported by Haddock et al. in 1965.<ref name=ThoennessenReview>{{Cite book |last=Thoennessen |first=Michael |title=The Discovery of Isotopes |chapter-url=http://link.springer.com/10.1007/978-3-319-31763-2_16 |chapter=Unbound Isotopes |date=2016 |publisher=Springer International Publishing |isbn=978-3-319-31761-8 |location=Cham |pages=275–291 |language=en |doi=10.1007/978-3-319-31763-2_16 |access-date=2024-01-05 |archive-date=2024-05-12 |archive-url=https://web.archive.org/web/20240512232101/https://link.springer.com/chapter/10.1007/978-3-319-31763-2_16 |url-status=live }}</ref>{{rp|275}} 

Evidence for unbound clusters of 4 neutrons, or [[tetraneutron]] as resonances in the disintegration of [[beryllium]]-14 nuclei,<ref>{{cite journal |last1=Marqués |first1=F. M. |last2=Labiche |first2=M. |last3=Orr |first3=N. A. |last4=Angélique |first4=J. C. |last5=Axelsson |first5=L. |last6=Benoit |first6=B. |last7=Bergmann |first7=U. C. |last8=Borge |first8=M. J. G. |last9=Catford |first9=W. N. |last10=Chappell |first10=S. P. G. |last11=Clarke |first11=N. M. |last12=Costa |first12=G. |last13=Curtis |first13=N. |last14=D’Arrigo |first14=A. |last15=de Góes Brennand |first15=E. |date=2002-04-01 |title=Detection of neutron clusters |url=https://link.aps.org/doi/10.1103/PhysRevC.65.044006 |journal=Physical Review C |language=en |volume=65 |issue=4 |page=044006 |doi=10.1103/PhysRevC.65.044006 |issn=0556-2813 |arxiv=nucl-ex/0111001 |bibcode=2002PhRvC..65d4006M |s2cid=37431352 |access-date=2024-01-05 |archive-date=2024-05-12 |archive-url=https://web.archive.org/web/20240512232054/https://journals.aps.org/prc/abstract/10.1103/PhysRevC.65.044006 |url-status=live }}</ref> in <sup>8</sup>He–<sup>8</sup>Be interactions,<ref name="Kisamori">{{cite journal |last= Kisamori |first= K. |display-authors= etal |year= 2016 |title= Candidate Resonant Tetraneutron State Populated by the He4(He8,Be8) Reaction |journal= [[Physical Review Letters]]|volume= 116 |issue= 5 |pages= 052501 |doi= 10.1103/PhysRevLett.116.052501|pmid= 26894705 |bibcode= 2016PhRvL.116e2501K }}</ref> and collisions of <sup>4</sup>He nuclei give an estimated lifetime around 10<sup>−22</sup> seconds.<ref>{{Cite journal |last1=Duer |first1=M. |last2=Aumann |first2=T. |last3=Gernhäuser |first3=R. |last4=Panin |first4=V. |last5=Paschalis |first5=S. |last6=Rossi |first6=D. M. |last7=Achouri |first7=N. L. |last8=Ahn |first8=D. |last9=Baba |first9=H. |last10=Bertulani |first10=C. A. |last11=Böhmer |first11=M. |last12=Boretzky |first12=K. |last13=Caesar |first13=C. |last14=Chiga |first14=N. |last15=Corsi |first15=A. |date=2022-06-23 |title=Observation of a correlated free four-neutron system |journal=Nature |language=en |volume=606 |issue=7915 |pages=678–682 |doi=10.1038/s41586-022-04827-6 |issn=0028-0836 |pmc=9217746 |pmid=35732764|bibcode=2022Natur.606..678D }}</ref>
These discoveries should deepen our understanding of the nuclear forces.<ref name="sciencealert">{{cite web|url=https://www.sciencenews.org/article/physicists-find-signs-four-neutron-nucleus|title=Physicists find signs of four-neutron nucleus|date=2016-02-24|access-date=2017-06-27|archive-date=2017-07-29|archive-url=https://web.archive.org/web/20170729030228/https://www.sciencenews.org/article/physicists-find-signs-four-neutron-nucleus|url-status=live}}</ref><ref>{{cite journal|first=Nigel|last=Orr|title=Can Four Neutrons Tango?|journal=[[Physics (American Physical Society magazine)|Physics]]|volume=9|date=2016-02-03|pages=14|doi=10.1103/Physics.9.14|bibcode=2016PhyOJ...9...14O|doi-access=free}}</ref>