Search for the 2+ excitation of the Hoyle state in 12C using the 12C(12C,3)12C reaction

T Muñoz-Britton (1) , M Freer (1) , N I Ashwood (1) , T a D Brown (2) , W N Catford (3) , N Curtis (1) , S P Fox (2) , B R Fulton (2) , C W Harlin (3) , a M Laird (2) , P Mumby-Croft (2) , a St. J Murphy (4) , P Papka (2) , D L Price (1) , K Vaughan (2) , D L Watson (2) , D C Weisser (5)

1 School of Physics and Astronomy
2 Department of Physics
3 Faculty of Engineering & Physical Sciences
4 SUPA School of Physics and Astronomy [Edinburgh]
5 RSPE - Research School of Physics and Engineering [Canberra}

A search for the 2 + excitation of the Hoyle state in 12 C has been performed using the 12 C(12 C, 3α) 12 C reaction at a beam energy of 101.5 MeV. An angular correlation analysis was used to suppress known contributions to the excitation energy spectrum, enhancing the experimental sensitivity. No strong evidence was found for new states in 12 C between 9 and 11 MeV ; rather upper limits for their excitation in the 12 C+ 12 C inelastic scattering reaction are determined.

Mots clés: 21.10.-k; 23.60.+e; 27.20.+n

T Muñoz-Britton, M Freer, N I Ashwood, T a D Brown, W N Catford, et al.. Search for the 2+ excitation of the Hoyle state in 12C using the 12C(12C,3)12C reaction. Journal of Physics G: Nuclear and Particle Physics, 2010, 37 (10), pp.105104. ⟨10.1088/0954-3899/37/10/105104⟩. ⟨hal-00600773⟩