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Breakup of 12C resonances into three α particles

O. S. Kirsebom ; M. Alcorta ; M. J. G. Borge ; M. Cubero ; C. A. Diget ; R. Dominguez-Reyes ; L. M. Fraile ; B. R. Fulton ; H. O. U. Fynbo ; S. Hyldegaard ; Björn Jonson (Institutionen för fundamental fysik, Subatomär fysik) ; M. Madurga ; A. M. Martin ; Thomas Nilsson (Institutionen för fundamental fysik, Subatomär fysik) ; Göran Nyman (Institutionen för fundamental fysik, Subatomär fysik) ; A. Perea ; K. Riisager ; O. Tengblad
Physical Review C (0556-2813). Vol. 81 (2010), 6,
[Artikel, refereegranskad vetenskaplig]

The reaction He-3 + B-11 -> d + C-12* has been used to populate resonances in C-12 up to an excitation energy of 15 MeV. The subsequent breakup to three alpha particles has been measured in complete kinematics. Dalitz plots are used to visualize and analyze the data. The Dalitz plot intensity distribution exhibits zero points characteristic of the total spin and parity of the 3 alpha system allowing us to determine the spin and parity of a state in C-12 at 13.35 MeV whose quantum numbers were hitherto not well established. The Dalitz plot intensity distributions of the 2(-) state at 11.83 MeV and the 1(+) state at 12.71 MeV are compared with the predictions of a recent three-body calculation as well as with simpler models. All are able to reproduce the gross structures seen in the Dalitz plot, but none give an accurate description of the detailed profile of the distributions.

Nyckelord: final-state, decay, nuclei, c12

Denna post skapades 2010-07-05. Senast ändrad 2014-09-02.
CPL Pubid: 123642


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Institutioner (Chalmers)

Institutionen för fundamental fysik, Subatomär fysik (2005-2013)



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