Study of the high-lying, high-spin + 28Si resonance structure in 32S

T Lönnroth (1) , K.-M Källman (1) , M Guttormsen (2) , a C Larsen (2) , P Manngård (3)

1 Department of Physics
2 Department of Physics [Oslo]
3 Department of General Studies

The structure of highly excited elastic α-scattering resonances in 32 S was studied with the reaction 28 Si(α, α 0) 28 Si at beam energies between 22 and 30 MeV. The data were collected with a thick-target method giving continuous energies. The properties of 24 resonances in the spin range  = 9 − 12 ¯ h, and up to 32 MeV excitation in 32 S, were determined. The strong drop-off in elastic cross section at about 27.5 MeV laboratory energy was studied, and a similar but less drastic effect is observed at 21.5 MeV. Some possible explanation for these behaviours are discussed. The present results complement previous high-resolution data at lower energies, and favours the interpretation of the resonances as α-cluster states. The implications on potential models from resonances with angular momenta as high as 12¯ h are discussed.

Mots clés: Physical Sciences

T Lönnroth, K.-M Källman, M Guttormsen, a C Larsen, P Manngård. Study of the high-lying, high-spin + 28Si resonance structure in 32S. Journal of Physics G: Nuclear and Particle Physics, 2011, 38 (3), pp.35107. ⟨10.1088/0954-3899/38/3/035107⟩. ⟨hal-00600885⟩