Phys.Rev. C 96, 044317 (2017)

D.Torresi, C.Wheldon, Tz.Kokalova, S.Bailey, A.Boiano, C.Boiano, M.Fisichella, M.Mazzocco, C.Parascandolo, D.Pierroutsakou, E.Strano, M.Zadro, M.Cavallaro, S.Cherubini, N.Curtis, A.Di Pietro, J.P.Fernandez-Garcia, P.Figuera, T.Glodariu, J.Grebosz, M.La Cognata, M.La Commara, M.Lattuada, D.Mengoni, R.G.Pizzone, C.Signorini, C.Stefanini, L.Stroe, C.Spitaleri

Evidence for ¹⁵O + α resonance structures in ¹⁹Ne via direct measurement

NUCLEAR REACTIONS ⁴He(¹⁵O, α), E=28.5 MeV, [secondary ¹⁵O beam from ¹H(¹⁵N, ¹⁵O), E=80 MeV primary reaction at LNL-XTU, Legnaro tandem Van de Graaff accelerator; measured Eα, Iα using a double-sided silicon strip detector (DSSSD), absolute differential cross sections. ¹⁹Ne; deduced levels, resonances, J, π, Γ_α, total Γ, partial decay branches, reduced α-widths, ¹⁵O+α rotational band, cluster structure using R-matrix analysis with AZURE2 code. Comparison with previous experimental results, and with potential model calculation using the well-known ¹⁶O+α cluster band configurations. Relevance to α branching ratio in the astrophysical reaction rate for high-spin near-threshold resonances.

doi: 10.1103/PhysRevC.96.044317