Four-Alpha Linear-Chain States in 16O
Naoyuki Itagaki, Akira Ohnishi, Kiyoshi Kato
Abstract
We study 4α linear-chain states in 16O in comparison with 3α states in 12C by using the Generator Coordinate Method within a microscopic Nα-cluster model. It is shown to be very important to solve relative motion of α-clusters by taking into account the orthogonality between the linear-chain states and other low-lying states including the ground state. For 12C, the 3α chain state disappears because of this orthogonality. The 4α chain state in 16O, on the other hand, is hardly affected by low-lying states and persists to remain above the 4α threshold. The calculated moment of inertia of the 4α linear-chain rotational band (88 keV) reproduces the experimentally suggested value qualitatively.
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