Direct mass measurements of neutron-rich light nuclei nearN=20

The simultaneous direct mass measurements of 21 neutron-rich nuclei ranging from ¹⁹C to ³⁷P have been performed with a new type of recoil spectrometer. The masses of ¹⁹C, ²⁷⁻⁻²⁸Ne, ³²⁻⁻³⁴Al, ³⁶Si, and ³⁷P have been determined for the first time. No evidence of an increase in the two-neutron separation energy as noted for ³¹⁻⁻³²Na is observed for ³⁰⁻⁻³²Mg and ³²⁻⁻³⁴Al.