Spectroscopy of ${}^{36}{Mg}$ : Interplay of Normal and Intruder Configurations at the Neutron-Rich Boundary of the “Island of Inversion”

We report on the first spectroscopy study of the very neutron-rich nucleus

{}_{12}^{36}{Mg}_{24}

using the direct two-proton knockout reaction

{}^{9}{Be} ({}^{38}{Si}, {}^{36}{Mg} + γ) X

83 MeV / nucleon

. The energy of the first excited

2^{+}

state of

{}^{36}{Mg}

E (2_{1}^{+}) = 660 (6) keV

, was measured. The magnitude of the partial cross sections to the ground state and the

2_{1}^{+}

state is indicative of strong intruder admixtures in the lowest-lying states as suggested by Monte Carlo shell-model calculations.

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Spectroscopy ofMg36: Interplay of Normal and Intruder Configurations at the Neutron-Rich Boundary of the “Island of Inversion”