A cluster-transfer experiment 9 Be( 9 Be, 14 C * → α+ 10 Be)α was carried out using an incident beam energy of 45 MeV. This reaction channel has a large Q-value that favors populating the high-lying states in 14 C and separating various reaction channels. A number of resonant states are reconstructed from the forward emitting 10 Be + α fragments with respect to three sets of well discriminated final states in 10 Be, most of which agree with the previous observations. A state at 22.5(1) MeV in 14 C is found to decay predominantly into the states around 6 MeV in 10 Be daughter nucleus, in line with the unique property of the predicted band head of the σ-bond linear-chain molecular states. A new state at 23.5(1) MeV is identified which decays strongly into the first excited state of 10 Be.

A new 11 Be(d, p) 12 Be transfer reaction experiment was carried out in inverse kinematics at 26.9A MeV, with special efforts devoted to the determination of the deuteron target thickness and of the required optical potentials from the present elastic scattering data. In addition a direct measurement of the cross section for the 0 + 2 state was realized by applying an isomer-tagging technique. The s-wave spectroscopic factors of 0.20 +0.03 −0.04 and 0.41 +0.11 −0.11 were extracted for the 0 + 1 and 0 + 2 states, respectively, in 12 Be. Using the ratio of these spectroscopic factors, together with the previously reported results for the p-wave components, the single-particle component intensities in the bound 0 + states of 12 Be were deduced, allowing a direct comparison with the theoretical predictions. It is evidenced that the ground-state configuration of 12 Be is dominated by the d-wave intruder, exhibiting a dramatic evolution of the intruding mechanism from 11 Be to 12 Be, with a persistence of the N = 8 magic number broken.

A cluster-transfer experiment of 9 Be( 9 Be, 14 C → α+ 10 Be)α at an incident energy of 45 MeV was carried out in order to investigate the molecular structure in high-lying resonant states in 14 C. This reaction is of extremely large Q-value, making it an excellent case to select the reaction mechanism and the final states in outgoing nuclei. The high-lying resonances in 14 C are reconstructed for three sets of well discriminated final states in 10 Be. The results confirm the previous decay measurements with clearly improved decay-channel selections and show also a new state at 23.5(1) MeV. The resonant states at 22.4(3) and 24.0(3) MeV decay primarily into the typical molecular states at about 6 MeV in 10 Be, indicating a well developed cluster structure in these high-lying states in 14 C. Further measurements of more states of this kind are suggested.

A set of global optical potential parameters, DA1p, for deuterons with the 1p-shell nuclei is obtained by simultaneously fitting 67 sets of experimental data of deuteron elastic scattering from 6 Li, 9 Be, 10 B, 11 B, 12 C, 13 C, 14 N, 16 O and 18 O with incident energies between 5.25 and 170 MeV.DA1p improves the description of the deuteron elastic scattering from the 1p-shell nuclei with respect to the existing systematic deuteron potentials and can give satisfactory reproduction to the experimental data with radiative nuclei such as 9 Li, 10 Be, 14 C and 14 O.PACS numbers: 24.10. Ht, 24.50.+g, 25.45.De

Abstract(Quasi-)one-dimensional systems exhibit various fascinating properties such as Luttinger liquid behavior, Peierls transition, novel topological phases, and the accommodation of unique quasiparticles (e.g., spinon, holon, and soliton, etc.). Here we study molybdenum blue bronze A0.3MoO3 (A = K, Rb), a canonical quasi-one-dimensional charge-density-wave material, using laser-based angle-resolved photoemission spectroscopy. Our experiment suggests that the normal phase of A0.3MoO3 is a prototypical Luttinger liquid, from which the charge-density-wave emerges with decreasing temperature. Prominently, we observe strong renormalizations of band dispersions, which are recognized as the spectral function of Holstein polaron derived from band-selective electron-phonon coupling in the system. We argue that the strong electron-phonon coupling plays an important role in electronic properties and the charge-density-wave transition in blue bronzes. Our results not only reconcile the long-standing heavy debates on the electronic properties of blue bronzes but also provide a rare platform to study interesting excitations in Luttinger liquid materials.