Analogues of the exotic Hoyle state in the C-12 nucleus

作者：Goncharov S A^*; Demyanova A S; Ogloblin A A; Danilov A N; Belyaeva T L; Trzaska W

来源：Moscow University Physics Bulletin, 2015, 70(5): 333-340.

DOI：10.3103/S0027134915050057

• inelastic scattering
• light nuclei
• diffraction model
• nuclear radius
• excited states

Experimental data on inelastic scattering of alpha particles by the B-11, C-12, and C-13 nuclei are analyzed using the modified diffraction model and the radii of these nuclei in some "abnormal" excited states are found. It is shown that the 0 (2) (+) (7.65 MeV) Hoyle state in the C-12 nucleus is the base state for a new 0 (2) (+) -2 (2) (+) -4 (2) (+) rotational band (in addition to the ground-state band), in which the third member is the discovered 4 (2) (+) (13.75 MeV) state. The radii of the C-12 nucleus in the above-mentioned three states are 25-30% larger than its ground state radius. It is found that the radii of the 1/2(-) (8.86 MeV) state in the C-13 nucleus and the 3/2(-) (8.56 MeV) state in the B-11 nucleus are close to the radius of the Hoyle state in C-12 and that a similar rotational band is based on the 8.56 MeV state. The above C-13 and B-11 states can be regarded as analogues of the Hoyle state. The prediction of the alpha-condensation model that a similar analogue in B-11 is the 12.56 MeV state with a radius that is comparable with the nuclear radius of uranium was not confirmed.

• 出版日期2015-9