Abstract
The spectroscopy of 27Ne has been investigated through the one-neutron transfer reaction 26Ne(d,p)27Ne in inverse kinematics at 9.7 MeV/nucleon. The results strongly support the existence of a low-lying negative parity state in 27Ne, which is a signature of a reduced sd–fp shell gap in the N=16 neutron-rich region, at variance with stable nuclei.
Highlights
The spectroscopy of 27Ne has been investigated through the one neutron transfer reaction 26Ne(d,p)27Ne in inverse kinematics at 9.7 MeV/nucleon
The study of the single particle excitations in N = 17 isotones is well suited to determine the spacing between the d3/2 subshell and the f p shell
Single particle excitations where the d3/2 neutron is promoted to the f p shell, result in negative parity excited states
Summary
The spectroscopy of 27Ne has been investigated through the one neutron transfer reaction 26Ne(d,p)27Ne in inverse kinematics at 9.7 MeV/nucleon. Single particle excitations where the d3/2 neutron is promoted to the f p shell, result in negative parity excited states. The most bound N = 17 isotones 35Ar, 33S and 31Si have high lying negative parity states at excitation energies of ∼ 3.5 MeV.
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