Ne – 2

An important example of alpha clustering phenomena in atomic nuclei is the α-condensed states in nuclei, where all the α clusters are condensed into the lowest s orbit. It is theoretically predicted that such nα-condensed states appear in the heavier self-conjugate A = 4n nuclei than ¹²C up to n = 10. In order to search for the α-condensed state in ²⁰Ne, we performed the high-resolution measurement of the excitation energy spectrum of the inelastic alpha scattering at the forward angles including 0 degrees in coincidence with the measurement of the decaying particles from the excited states. The experiment was conducted at RCNP with the newly-developed gas target system.

I will report the tentative results of the excitation energy spectrum in ²⁰Ne and the measurement of the decay particles. The decay-particle measurement from the excitation-energy region of interest is important because the branching ratio to the alpha decay and the energy of the decay alpha particle should shed light on the nature of the excited states. The excitation energy spectra are obtained by gating on both the alpha-decay and the proton-decay channels and will be compared each other. In addition, the excitation-energy spectrum which is obtained by gating on the ⁸Be-decay channel may be also shown.