The Rotation-Vibration Structure of 12C

3rd International Workshop on "State of the Art in Nuclear Cluster Physics"

Gai, M.^1,2 ; Bijker, R.^3 ; Freer, M.^4 ; Kokalova, T.^4 ; Marin-Lambarri, D.J.^4 ; Wheldon, C.^4

LNS at Avery Point, University of Connecticut, Groton

CT

06340-6097, United States^1

WNSL, Dept of Physics, Yale University, New Haven

CT

06520-8124, United States^2

Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico, A.P. 70-543, Mexico D.F.

04510, Mexico^3

School of Physics and Astronomy, University of Birmingham, Birmingham

B15 2TT, United Kingdom^4

关键词: Bending modes;    Geometrical arrangements;    High spins;    Light nuclei;    Rotation vibration;    Rotational band;    Spinning tops;    Triatomic molecules;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/569/1/012011/pdf
DOI  :  10.1088/1742-6596/569/1/012011

来源: IOP

【 摘 要 】

The newly measured high spin Jπ5-state at 22.4(2) MeV in12C reported in this conference, fits very well to the predicted (ground state) rotational band of an oblate equilateral triangular spinning top with a D3h symmetry characterized by the sequence of states: 0+, 2+, 3-4±, 5-with almost degenerate 4+and 4-(parity doublet) states. Such a D3h symmetry was observed in triatomic molecules, and it is observed here for the first time in nuclear physics. We discuss a classification of other rotation-vibration bands in12C such as the (0+) Hoyle band and the (1-) bending mode band and suggest measurements in search of the predicted ("missing") states that may shed new light on clustering in12C and light nuclei. In particular, the observation (or non observation) of the predicted ("missing") states in the Hoyle band will allow us to conclude the geometrical arrangement of the three alpha particles composing the Hoyle state at 7.654 MeV in12C.