Recent Developments in Nuclear Cluster Physics

Horiuchi, Hisashi; Ikeda, Kiyomi; Katō, Kiyoshi

doi:10.1143/ptps.192.1

Cited by 193 publications

(208 citation statements)

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“…We employed antisymmetrized molecular dynamics (AMD) [12,13] as the basis state for nuclei, and introduced two kinds of correlation functions: the tensoroperator type and central-operator type. The AMD wave function is suitable for describing nuclear clustering, which is one of the important aspects of nuclear structure such as the triple-α Hoyle state in 12 C [14,15]. The correlation functions are multiplied to the AMD wave function and these components are superposed with the original AMD wave function.…”

Section: Introductionmentioning

confidence: 99%

Power series expansion method in tensor-optimized antisymmetrized molecular dynamics beyond the Jastrow correlation method

et al. 2017

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We developed a new variational method for tensor-optimized antisymmetrized molecular dynamics (TOAMD) for nuclei. In TOAMD, the correlation functions for the tensor force and the short-range repulsion are introduced and used in the power series form of the wave function, which is different from the Jastrow method. Here, nucleon pairs are correlated in multi-steps with different forms, while they are correlated only once including all pairs in the Jastrow correlation method. Each correlation function in every term is independently optimized in the variation of total energy in TOAMD. For s-shell nuclei using the nucleon-nucleon interaction, the energies in TOAMD are better than those in the variational Monte Carlo method with the Jastrow correlation function. This means that the power series expansion using the correlation functions in TOAMD describes the nuclei better than the Jastrow correlation method.

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Section: Introductionmentioning

confidence: 99%

Power series expansion method in tensor-optimized antisymmetrized molecular dynamics beyond the Jastrow correlation method

et al. 2017

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“…For isospin-asymmetrical nuclei, the presence of valence nucleons surrounding the cores may help to stabilize these multi-body quantum systems, similar to the molecular configuration for atomic systems [1,2,4]. It is well established that neutron-excess beryllium isotopes are good candidates for molecular structure due to its richness of valence neutron combinations built on a well established α + α rotor of 8 Be [5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…We report here on a reaction 9 Be( 9 Be, 14 C) 4 He to study the cluster states in 14 C. This reaction channel has an extremely large Q-value compared to other competing reaction channels. The highlying states in 14 C are reconstructed from the 10 Be + α decay channels.…”

Section: Introductionmentioning

confidence: 99%

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

Ye¹,

Tian²,

Li³

2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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Aimed at investigating the molecular structure in high-lying resonant states in 14 C, a clustertransfer experiment, 9 Be( 9 Be, 14 C → α + 10 Be)α at an incident energy of 45 MeV, was carried out. This reaction possesses a very large Q-value, which is therefore 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 separated final states in 10 Be. The results confirm the previous decay measurements with improved decay-channel selections and exhibit also a new state at 23.5(1) MeV. The resonant states at 22.4(3) and 24.0(3) MeV decay almost exclusively into the typical molecular states at about 6 MeV in 10 Be, implying a well developed cluster structure in these high-lying states in 14 C. Further measurements of more states of this kind are expected.

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“…The α cluster structures have been extensively studied for the so-called 4N nuclei with N = Z, such as 8 Be = 2α, 12 C = 3α, 16 O = α + 12 C, and 20 Ne = α + 16 O [1][2][3]. In current studies, the importance of the cluster degrees of freedom has been extended to the neutron-rich (N > Z) systems, which are obtained by adding extra neutrons to the 4N cluster systems.…”

Section: Introductionmentioning

confidence: 99%

αcluster structures in unbound states in¹⁹Ne

Otani

Iwasaki

Itô

2016

EPJ Web of Conferences

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Abstract. Cluster structures in 19 Ne are studied by the microscopic and macroscopic cluster models. In the microscopic calculation, the coupled-channels problem of ( 3 He+ 16 O) + (α+ 15 O) is solved, and the adiabatic energy surfaces, which are the series of the energy eigenvalues as a function of the He-O distance, are investigated. In the adiabatic energy curves, the several local minima are generated in the spatial region of the small core distance, where the neutron hole inside of the He or O nucleus is strongly coupled to the residual nuclei. The energy spectra, which are constructed from the strong coupling states, nicely reproduce the the low-lying energy levels in the 19 Ne nucleus. In the macroscopic approach, the α + 15 O potential is evaluated from the elastic scattering of the α + 15 N system, and the resonant levels of the α + 15 O system are calculated under the absorbing boundary condition. The potential model predicts the existence of the resonances above the α threshold, which has a weak-coupling scheme of the α particle and one hole inside of the 16 O nucleus. The extended microscopic calculations of ( 3 He+ 16 O) + (α+ 15 O) + ( 5 He+ 14 O) are performed in order to see the coupling effect of the 5p-2h configuration, which corresponds to the shell model limit of the 5 He + 14 O cluster configuration. The extended calculation suggests that the 5 He + 14 O configuration plays an important role on the formation of the 3/2 + resonance at 0.5 MeV with respect to the α threshold. IntroductionThe α cluster structures have been extensively studied for the so-called 4N nuclei with N = Z, such as 8 Be = 2α, 12 C = 3α, 16 On the contrary, cluster structures in the 4N systems with a hole in a cluster core, are also interesting research subjects [7][8][9][10][11]. For example, there is a recent study of 11 B = α + α + t, corresponding to a proton hole system of 12 C = 3α [7]. Pioneering work of the hole system is the study of the 19 F nucleus [8][9][10][11]. The 19 F nucleus is the one proton deficient system of 20 Ne, and the rotational bands a

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Recent Developments in Nuclear Cluster Physics

Cited by 193 publications

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Power series expansion method in tensor-optimized antisymmetrized molecular dynamics beyond the Jastrow correlation method

Power series expansion method in tensor-optimized antisymmetrized molecular dynamics beyond the Jastrow correlation method

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

αcluster structures in unbound states in¹⁹Ne

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Recent Developments in Nuclear Cluster Physics

Cited by 193 publications

References 0 publications

Power series expansion method in tensor-optimized antisymmetrized molecular dynamics beyond the Jastrow correlation method

Power series expansion method in tensor-optimized antisymmetrized molecular dynamics beyond the Jastrow correlation method

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

αcluster structures in unbound states in19Ne

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αcluster structures in unbound states in¹⁹Ne