One-dimensionality in atomic nuclei: A candidate for linear-chainαclustering inC14

Abstract

The clustering of α particles in atomic nuclei results in the self-organization of various geometrical

Three-body decay of linear-chain states in C14

“…The first band, which we call a π -bond linear chain, has two valence neutrons in a π orbit and is built on the 0 + state at 14.6 MeV which is just above the α + 10 Be threshold but below the 2α + 6 He threshold. It was found that the energies and widths of the resonances observed by the α + 10 Be elastic scattering [36,37] qualitatively agree with the theoretical calculations [15,18] including ours. Therefore, they are regarded as the π -bond linear-chain candidates, although the experimental spin-parity assignment was somewhat ambiguous.…”

“…Yamaguchi et al [39] reported the result of the α + 10 Be elastic scattering and updated the information about the candidates of the π -bond linear chain. Although the spin-parity assignments for several states are not consistent with those found in previous experiments [35][36][37]39], they first observed a candidate of the bandhead of the linear chain (J π = 0 + ), which should be compared with theoretical calculations. The other experiment was reported by Tian et al [40] and Li et al [41] who observed the resonances populated by the 9 Be( 9 Be,α + 10 Be)α reaction.…”

“…It was pointed out that the motion of the valence neutron can be qualitatively interpreted in terms of the molecular orbits analogous to the Be isotopes [23][24][25][26][27][28][29], which are called π and σ orbits. Concurrently, rather promising candidates of the linear chain were reported in 14 C and 16 C by several experiments [30][31][32][33][34][35][36][37][38]. In our previous study [22], based on an antisymmetrized molecular dynamics (AMD) calculation, we pointed out that two positive-parity rotational bands in 14 C have the linear-chain configurations.…”

Cluster Decay Of The High-lying Excited States In 14C

“…Again we see a good match of the 14 C-states which decay simultaneously into 10 Be gs and 10 Be(3.4MeV, 2 + ). Most of these resonant states have also been observed in recent resonant scattering experiment [18,19], where spin assignment were made using the angular correlation method. The states at very high energy of 23.5(1) MeV has only been identified in the present experiment, which might be an extension of the tentatively proposed molecular rotation band (see Fig.12 in Ref.…”

“…Since then a number of 2n transfer or 2p removal experiments were also performed to populate the high-lying excited states in 14 C. These reactions are more sensitive to the single-particle configurations with oblate or prolate deformations [14,15,16,17]. The latest resonant α-scattering experiments are dedicated to search for cluster states in 14 C. Based on the observed resonant states some possible molecular-rotation bands or linear-chain states were proposed [18,19]. However due to the limited energy resolution of this thick-target method, the decays to 6 MeV states in 10 Be were not distinguished.…”