"The Israeli Joint Nuclear Physics Seminars: New Symmetry of the Cluster Model"

Mon, 12/01/201516:55-17:45
The large seminar room of the Physics building, Weizmann Institute of Science
Lecturer: Prof. Moshe Gai Affiliation: University of Connecticut and Yale University Abstract: Recent measurements of the structure of 12C [1] using an optical readout TPC (O-TPC) [2] and gamma beams allowed the first study of the rotation vibration spectrum of 12C which appears strikingly similar to the spectrum predicted by a new algebraic cluster model [3] employing a geometrical (D3h) symmetry with predicted recurring rotational bands including the states: 0+, 2+, 3-, (degenerate) 4+ and 4-, 5- etc [4, 5]. Such structures and symmetries are common in molecular physics, but have been observed in nuclear physics for the first time. This model also allow us to elucidate the structure of the Hoyle state and as such it is in conflict with ab-initio effective field theory calculations on the lattice [5] that predict different structure of the Hoyle state. The calculations on the lattice on the other hand use the Hoyle state to conclude the masses of light quarks and the strength of the electromagnetic interaction (within the anthropic view of the universe). Extension of this study to the newly constructed ELI-NP gamma ray facility in Bucharest with a Warsaw-UConn electronic readout TPC (eTPC) will be discussed. [1] W.R. Zimmerman et al.; Phys. Rev. Let. 110, 152502 (2013). [2] M. Gai et al.; JINST 5, 12004 (2010) [3] R. Bijker and F. Iachello; Ann. Phys. 298, 334 (2002) [4] D.J. Marin-Lambarri et al.; Phys. Rev. Lett. 113, 012502 (2014) [5] Hamish Johnston, Physicsworld.com: http://physicsworld.com/cws/article/news/2014/jul/08/carbon-nu [6] E. Epelbaum et al.; Phys. Rev. Lett., 110, 112502 (2013) Additional details of the upcoming Israeli Joint Nuclear Physics' Seminars can be found on the following link. ‏האירוע הזה כולל שיחת וידאו ב-Google Hangouts. הצטרף: https://hangouts.google.com/hangouts/_/mail.huji.ac.il/the-israeli?hceid...