Chapter IV. Alpha-Cluster Structure in Neon Region

Huang, Jun; Nemoto, Fumiki; BandН, Hiroharu

doi:10.1143/ptps.52.173

Cited by 21 publications

(13 citation statements)

References 15 publications

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“…We show that the scattering data of the sHe and p system, the energy dependences of the phase shifts and the energy levels are quite well reproduced by the cluster model with the use of RENP. As further evidence of large deviation from the simple spherical shell model in these nuclei we have many low-lying non-normal parity states, such as the first excited 1/2+ state at 1.68 MeV of 9 Be and the ground 1/2+ state of 11 Be. 24 80 \ and have interpreted the lowlying non-normal parity states but have not given sufficient descriptions of energy levels in 10 Be and liB.…”

Section: 25mentioning

confidence: 83%

“…In the a-transfer reaction of 6 Li eLi, d) 11 B, m> the total cross section to the 5/21 + state at 7.29 MeV is about 4 times large compared with the case to the low-lying normal parity states. The calculated 7 Li (3/2-, 0.0 MeV) +a reduced width amplitude (RWA) of the 5/21 + state is compared with that of the 3/21-ground state of 11 B in Fig.…”

Section: Non-normal Parity Statesmentioning

confidence: 94%

“…Furthermore, anomalies are observed in the elastic a scattering, 23 >' 24 > which suggests the existence of the 6 Li +a or 7 Li +a cluster structure for the 10 B or 11 B nucleus near the at NERL on May 26, 2015 http://ptps.oxfordjournals.org/ Downloaded from at NERL on May 26, 2015 http://ptps.oxfordjournals.org/ Downloaded from 1.1.13. In § 2, we show microscopic investigations of the N-a and d-a in-teractions on the basis of RENP.…”

Section: 12mentioning

confidence: 99%

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Chapter III. Study of Non-Alpha-Nuclei Based on the Viewpoint of Cluster Correlations

Furutani

Kanada

Kaneko

et al. 1980

Prog. Theor. Phys. Suppl.

139

199

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Contents § 1. Introduction and summary 1.1. Viewpoint of cluster correlations in non-alpha-nuclei 1.2. Interactions between few-nucleon clusters 1.3. Motion of individual nucleons in molecule-like nuclei 1.4. Multi-cluster model for non-alpha-nuclei 1.5. Alpha and three-nucleon cluster states in lightest sd-shell and A=15 nuclei § 2. Interactions between few-nucleon clusters 2.1. Realistic effective nuclear potentials 2.2. N-a interaction 2.3. d-a interaction and distortion effect of deuteron 2.4. Excited states in A=4 system with 3N+N cluster model § 3. Molecular structure in the 8 Be-core region 3.1. Motion of a nucleon around a 8 Be·core 3.2. Molecular orbital model . Structure of 9 Be nucleus 3.4. Structure of 10 B nucleus 3.5. Structure of neutron-rich Be-and B-isotopes § 4. Three-cluster model of the A=lO and 11 nuclei 4.1. Orthogonality condition model § 5. 4.2. 2a + t cluster model of 11 B nucleus 4.3. 2a+d cluster model of 10 B and 10 Be nuclei 4.4. Effect of the complete antisymmetrization Alpha and three-nucleon cluster states in lightest nuclei 5.1. Structure of A=19 nuclei 5.2. Structure of A=l8 nuclei 5.3. Structure of A=l7 nuclei 5.4. Structure of A=l5 nuclei § 1. Introduction and summary sd-shell 1.1. Viewpoint of cluster correlations in non-alpha-nuclei and A=151.1.1. The light nuclei (we consider in this chapter the P-shell and lightest sd-shell nuclei) have a relatively small number of nucleons, and their characters vary remarkably from nucleus to nucleus, showing strong individuality. Even in these light nuclei we see the persistency of saturation property which is considered a fundamental property of overall nuclei. In light nuclei, the saturation property emerges through formation of the acluster as a saturating subunit. This is the fundamental aspect prescribing the characteristics of light nuclei. The basic viewpoint of a-cluster structure in light nuclei has been presented in Ref. 1). As stated in detail in the previous chapter, 2 l recent investigations on light a-nuclei 3 l~el exhibit a remarkable success of the a-cluster model, which provides us with a comprehensive understanding of nuclear structure including quite high excited states, where coexistence of the shell and cluster structures and structure change between them can be understood in a unified way. Now we naturally proceed to an extensive investigation of non-a-nuclei from the cluster-model viewpoint. 1.1.2.The structure of light nuclei has been explained mostly in terms of the intermediate-coupling shell model or the deformed shell model, like the Nilsson model and the deformed Hartree-Fock method. They assume the formation of a static one-center single-particle field. The 9 Be nucleus, on the other hand, has long been considered a prototype of the molecule-like structure of nuclei, in which two a-particles constitute a stable dumbbell-like core and a remaining (valence) neutron moves on a single-particle orbital at NERL on May 26, 2015 http://ptps.oxfordjournals.org/ Downloaded from tion, which is an "elementary interaction...

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Section: 25mentioning

confidence: 83%

Section: Non-normal Parity Statesmentioning

confidence: 94%

Section: 12mentioning

confidence: 99%

See 1 more Smart Citation

Chapter III. Study of Non-Alpha-Nuclei Based on the Viewpoint of Cluster Correlations

Furutani

Kanada

Kaneko

et al. 1980

Prog. Theor. Phys. Suppl.

139

199

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“…24) which gave the correct binding energy of the 3a system. However, the direct potential with the depth multiplied by 1.1 gives better fit in the a-a phase shifts as was noticed by Saito 3 > (cf.…”

Section: The Interaction Between 3a Clustersmentioning

confidence: 97%

Chapter V. Microscopic Study of the Interaction between Complex Nuclei

Tohsaki-Suzuki

Kamimura

Ikeda

1980

Prog. Theor. Phys. Suppl.

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“…Some authors used a phenomenologica l density dependent force of the Skyrme type in accluster model calculations. 6 l This force gives fairly good results for binding energies. The Skyrme type density dependence, however, does not necessarily correspond to the above-mentioned real effect and cannot enhance alpha-clusterizati on sufficiently.…”

mentioning

confidence: 87%

Realistic Effective Interaction between Nucleons in Cluster States of Light Nuclei: Starting-Energy-Dependent Interaction and Its Application to Alpha-Cluster plus 16O-Core Model of 20Ne

Yamamoto

1974

Progress of Theoretical Physics

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471With the aim of studying clustering problems in light nuclei on the basis of the characteristic properties of realistic nuclear forces, a starting-energy-dependent interaction is presented as a realistic effective interaction which simply represents the state-dependence of the reaction matrix caused by the triplet-even tensor force. This interaction is applied to the. alpha-cluster plus "0-core model of 20 Ne and compared with results for Volkov forces. It is shown that the starting-energy-dependence of the former acts to enhance alpha-clusterization with a mechanism different from the strong odd state repulsions of the latters. A density-dependence of an effective interaction. due to the short-range-repulsive core is further incorporated so as to assure the overall-saturation. A preliminary application to the 16 0-"0 system is made successfully. § I. IntroductionRecent experimental and theoretical studies have revealed the extensive existence of the states with cluster structure in light nuclei_l> In many cases these cluster states exist in the same energy region as normal shell model states. Such coexistence of shell and cluster states is a characteristic. manifestation of the nuclear saturation property, which leads to almost the same binding energy per particle in both states. Therefore, it is necessary to study cluster structures on the basis of our knowledge of the nuclear saturation mechanism.Some phenomenological effective interactions with simple exchange characters, e.g., V olkov forces, have been used in most of microscopic cluster model calculations. 1 )' 2 l In the case of these interactions the saturation property is assured, though only. for a few number of nuclei, by unrealistically strong repulsions in odd states. Strong odd state repulsions are known to enhance clusterization in a nucleus. On the other hand, investigations by the reaction matrix theory have . clarifi~d that the nuclear saturation is mainly attributable to the short-range repulsive core and the strong tensor part in realistic nuclear forces. In particular the overaU saturation from the a-particle to infinite nuclear matter can be realized mainly by the shielding effect of the triplet-even tensor force, which means that the relative weight of the tensor force contributions 1s strongly reduced by many-body effects with increase of mass number. 3 > Od 1 -2.12 *' This is made, for example, by taking the path of the inversion motion as the generator coordinate together with the relative motion between alpha-cluster and 1 '0-core. 11 '

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Chapter IV. Alpha-Cluster Structure in Neon Region

Cited by 21 publications

References 15 publications

Chapter III. Study of Non-Alpha-Nuclei Based on the Viewpoint of Cluster Correlations

Chapter III. Study of Non-Alpha-Nuclei Based on the Viewpoint of Cluster Correlations

Chapter V. Microscopic Study of the Interaction between Complex Nuclei

Realistic Effective Interaction between Nucleons in Cluster States of Light Nuclei: Starting-Energy-Dependent Interaction and Its Application to Alpha-Cluster plus 16O-Core Model of 20Ne

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