8-12 July 2013
Africa/Johannesburg timezone
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Search for the 5 alpha cluster state in 20Ne

Presented by Mr. Jacobus SWARTZ on 9 Jul 2013 from 11:10 to 11:30
Type: Oral Presentation
Session: NPRP
Track: Track B - Nuclear, Particle and Radiation Physics


The primary aim of this experimental investigation was to search for the elusive 0+ 5 alpha cluster state in 20Ne, which is expected in the energy region above the 5 alpha threshold in 20Ne (Ex = 19.17 MeV) [1]. It would be an analogue to the Hoyle state in 12C [2,3], which plays a crucial role in stellar nucleosynthesis and has a well established 3 alpha cluster structure [4]. The secondary aim was to search for new low spin states at high excitation energy in 20Ne. During four weekends between April and July of 2012, the 22Ne(p,t)20Ne reaction was investigated with the iThemba LABS K600 magnetic spectrometer. A proton beam with an energy of Elab = 60 MeV from the Separated Sector Cyclotron (SSC) facility impinged on a 22Ne gas target at lab angles of θlab = (0˚, 7˚, 16˚, 27˚). At least three new states in 20Ne have been observed. Two of these appear to be isobaric analogues of known states in 20O. There is also a tentative candidate for the 5 alpha cluster state at around Ex = 22.49 MeV in 20Ne. [1] K. Ikeda, N. Takigawa and H. Horiuchi, Suppl. Prog. Theo. Phys., Extra Number p 464 (1968). [2] F. Hoyle, The Astrophysical Journal, Supplement Series, Vol. 1 p. 12 (1954). [3] C.W. Cook, W.A. Fowler, C.C. Lauritsen and T. Lauritsen, Phys. Rev. 107, 508 (1957). [4] A. Tohsaki, H. Horiuchi, P. Schuck and G. Rӧpke, Phys. Rev. Lett. 87, 192501 (2001).






Prof. Paul Papka papka@sun.ac.za Stellenbosch University




Location: A1-38

Primary authors