Monday, August 13, 2018, 12:00 PM, room 112
Cheuk-Yin Wong (Oak Ridge National Laboratory)
Wheeler's Toroidal Nuclei Wheeler suggested that under appropriate conditions, a nucleus may assume a toroidal shape [1]. Favorable conditions include a strong nuclear shell effect [2,3], a large Coulomb energies [2,3], a large angular angular momentum [4,5], nuclear dynamics [6], and combinations thereof [2-12]. The presence of these favorable conditions leading to toroidal nuclei as local energy minima in the light, intermediate, and superheavy regions [2-12] will be examined. Recent experimental evidence of toroidal high-spin isomers from Texas A & M in the disassembly of highly excited 28Si will be discussed [13].
[1] J.A.Wheeler, Nucleonics Notebook (1950),unpublished Princeton University Graduate Course Physics 576 Take-Home Examination Problem 2, May 22, 1963 (unpublished).
[2] C.Y.Wong, Toroidal nuclei, Phys.Lett.B 41,446(1972)
[3] C.Y.Wong, Toroidal and spherical bubble Nuclei, Ann.Phys.(N.Y.)77,279(1973)
[4] C.Y.Wong, Rotating toroidal nuclei, Phys.Rev.C17,331(1978)
[5] C.Y.Wong, Hot toroidal and bubble nuclei,Phys.Rev.Lett.55,1973(1985)
[6] X.M.Xu et al., Formation and Decay of Toroidal and Bubble Nuclei, Phys.Rev. C48, 933 (1993).
[7] A.Staszczak,C.Y.Wong, Toroidal super-heavy nuclei in Skyrme-Hartree-Fock approach, Acta Phys.PoB.B40:753-758,(2009)
[8] A.Staszczak,C.Y.Wong, A region of high-spin toroidal isomers, Phys.Lett.,Phys.Lett.B738,401(2014)
[9] A.Staszczak,C.Y.Wong, Toroidal high-spin isomers in light nuclei with N not equal to Z, Phys.Scr.90,114006(2015)
[10] A.Kosior,A.Staszczak,C.Y.Wong, Superheavy toroidal nuclei in the Skyrme energy functional framework, Acta Phys.Pol.B Proc.Suppl.10,249(2017)
[11]A.Staszczak,C.Y.Wong,A.Kosior, Toroidal high-spin isomers in the nucleus (Z,A)=(120,304), Phys. Rev. C 95, 054315 (2017)
[12]A.Kosior,A.Staszczak,C.Y.Wong, Properties of superheavy isotopes Z=120 and isotones N=184 within the Skyrme-HFB model,arXiv:1801.00954
[13]X.G.Cao et al., Evidence for high excitation energy resonances in the 7 alpha disassembly of 28Si, arxiv:1801.07366.

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