Phys.Rev. C 93, 044306 (2016)

P.Doornenbal, H.Scheit, S.Takeuchi, N.Aoi, K.Li, M.Matsushita, D.Steppenbeck, H.Wang, H.Baba, E.Ideguchi, N.Kobayashi, Y.Kondo, J.Lee, S.Michimasa, T.Motobayashi, A.Poves, H.Sakurai, M.Takechi, Y.Togano, K.Yoneda

Mapping the deformation in the "island of inversion": Inelastic scattering of ³⁰Ne and ³⁶Mg at intermediate energies

NUCLEAR REACTIONS Pb(³⁰Ne, ³⁰Ne'), E=232 MeV/nucleon; C(³⁰Ne, ³⁰Ne'), E=228 MeV/nucleon; Pb(³⁶Mg, ³⁶Mg'), E=223 MeV/nucleon; C(³⁶Mg, ³⁶Mg'), E=218 MeV/nucleon, [secondary ³⁰Ne and ³⁶Mg beams from ⁹Be(⁴⁸Ca, X), E=345 MeV/nucleon primary reaction using BigRIPS fragment separator at RIKEN facility]; measured particle spectra by Bρ-ΔE-TOF method using BigRIPS separator and ZeroDegree spectrometer, Eγ, Iγ, (particle)γ-coin using DALI2 array for γ detection, cross sections for the first 2+ states. ³⁰Ne, ³⁶Mg; deduced first 2+ levels, deformation lengths and B(E2) for the first 2+ states. Coulomb and nuclear excitations. Discussed neutron excitations across the N=20 shell for ³⁰Ne. Comparisons with state-of-the-art shell-model calculations. Systematics of energies of first 2+ and 4+ states, and B(E2) values for the first 2+ states in N=20 isotones, and ^{26,28,30,32,34}Ne, ^{28,30,32,34,36,38,40}Mg, together with comparison of experimental and theoretical values from shell-model calculations.

doi: 10.1103/PhysRevC.93.044306