hyperdeformation
{{Short description|Extremely deformed atomic nuclei}}
In nuclear physics, hyperdeformation is theoretically predicted states of an atomic nucleus with an extremely elongated shape and a very high angular momentum. Less elongated states, superdeformation, have been well observed, but the experimental evidence for hyperdeformation is more limited. Hyperdeformed states correspond to an axis ratio of 3:1. They would be caused by a third minimum in the potential energy surface, the second causing superdeformation and the first minimum being normal deformation.{{cite conference|first = G. G.|last = Adamian|author2=N. V. Antonenko |author3=Z. Gagyi-Palffy |author4=S.P. Ivanova |author5=R. V. Jolos |author6=Yu. V. Palchikov |author7=W. Scheid |author8=T.M. Shneidman|author9=A.S. Zubov|year = 2007|title = Nuclear Molecular Structure|book-title = Collective Motion and Phase Transitions in Nuclear Systems: Proceedings of the Predeal International Summer School in Nuclear Physics|edition = illustrated|publisher = World Scientific|page=483|isbn = 978-981-270-083-4}}
{{cite journal|last=Schunck|first=N.|author2=Dudek, J. |author3=Herskind, B. |date=May 2007|title=Nuclear hyperdeformation and the Jacobi shape transition|journal=Physical Review C|volume=75|issue=5|pages=id. 054304|doi=10.1103/PhysRevC.75.054304|bibcode = 2007PhRvC..75e4304S }}{{cite journal|last=Abusara|first=H.|author2=Afanasjev, A. V.|year=2009|title=Hyperdeformation in the Cd isotopes: A microscopic analysis|journal=Physical Review C|publisher=American Physical Society|volume=79|issue=2|pages=eid 024317|doi=10.1103/PhysRevC.79.024317|arxiv = 0902.0095 |bibcode = 2009PhRvC..79b4317A |s2cid=119268176 }} arXiv: [http://www.arxiv.org/abs/0902.0095v1 0902.0095v1] Hyperdeformation is predicted to be found in 107Cd.