Experimental study of high-lying states in $^{28}$Mg using the resonant elastic scattering of α particles

Abstract : The excitation function of Mg28 above the α-decay threshold has been measured for the first time using the resonant scattering of α particles with the technique of a thick target in inverse kinematics. Thirteen new states are reported between Ex=15.5 and Ex=20.5 MeV, and suggestions for spin-parity assignments are given for two of these. Calculations of the branching ratio to α decay for these states as well as comparison of the measured cross sections to calculations suggest that α+Neg.s.24 clustering is not dominant in this energy regime.
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Submitted on : Tuesday, November 8, 2016 - 3:58:18 PM
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J. Walshe, M. Freer, C. Wheldon, A. Soylu, N.L. Achouri, et al.. Experimental study of high-lying states in $^{28}$Mg using the resonant elastic scattering of α particles. Physical Review C, American Physical Society, 2016, 94 (5), pp.054304. ⟨10.1103/PhysRevC.94.054304⟩. ⟨in2p3-01394089⟩

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