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Alpha particle clustering is an important phenomenon in nuclear physics, especially for light nuclei. It is known that the α cluster structure appears near an α-decay threshold energy due to a strong correlation of four nucleons and relatively weak interaction between α clusters. For example, the 02 state in C, which locates at an excitation energy higher than the 3α-decay threshold by 0.39 MeV, has a spatially developed 3α structure. It is pointed out that this 02 state is the α condensed state in which all α clusters are condensed to the lowest energy orbit [1]. Generally, nuclear density in most nuclei is saturated around the normal density, but this α condensed state is less dense than normal nuclei [2]. Therefore, the α condensed states are of great interest as a new form of nuclear structure. It is a very natural question whether such an α-condensed state universally exists in the heavier self-conjugate A = 4N nuclei or not. According to a theoretical examination by Yamada et al., the α condensed states exist metastably up to Ca (N ≤ 10) [3]. Since all of the α clusters in the α condensed states occupy the same 0s orbit, overlaps between the α condensed states in different nuclei are quite large. Thus, the α condensed states prefer to decay into the lighter α condensed states. In this study, we searched for a 6α-condensed state which is theoretically predicted at an excitation energy of Ex = 33.4 MeV. We populated excited states at Ex = 32.1– 38.9 MeV in Mg (Mg*) by the C+C resonance scattering using a C beam at Ebeam = 36.5–56.7 MeV, and detected 6α particles emitted from the Mg* → C(02 ) + C(02 ) → 6α process. In this talk, we will report the details about the experiment and the result.

Search for the α Condensed State by Measuring the Inelastic Resonance Scattering 12C(12C,12C[\(0_{2}^{ + }\)])12C(\(0_{2}^{ + }\))