Experimental Study of Two-alpha Emission from High-lying Excited States of ^17,18Ne

The experiments of two-alpha emission from ^17,18Ne excited levels were performed at the HIRFL-RIBLL facility of the Institute of Modern Physics, Lanzhou. The beams of 17Ne at the energy of 49.9 MeV/u and ¹⁸Ne at 51.8 MeV/u bombarded a 197Au target to populate excited states of ^17,18Ne via Coulomb excitation. Complete kinematics measurements were achieved by the detectors of a silicon strip and CsI+PIN array. The experimental results combined with simple MC simulations show the characteristic of sequential two-alpha emission via 14O excited states for ¹⁸Ne. The results of two-alpha emission from ¹⁷Ne are preliminary and need further analyses.