Structure of Intrinsic States of K  = 0+ Bands in 20Ne: Study of Transient Character

Nemoto, Fumiki; Yamamoto, Yasuo; Horiuchi, Hisashi; Suzuki, Y.; Ikeda, Kiyomi

doi:10.1143/ptp.54.104

Cited by 26 publications

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“…This has been found also in AMD calculations, where this phenomenon was interpreted as the consequence of an increasing spin-orbit interaction [17]. A quite similar phenomenon was also discussed with the 5α GCM calculation [14].…”

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confidence: 75%

“…In the past decades, cluster structures in the deformed nucleus 20 Ne have been extensively studied [12][13][14][15][16][17][18][19] because this nucleus is one of a few nuclei with a strong admixture of cluster configurations in the ground state. In particular, it has a transitional character between deformed mean-field structures and cluster structures, as demonstrated in angular-momentum projected Hartree-Fock [12], resonating group method [13], 5α generator coordinate method (GCM) [14], and anti-symmetrized molecular dynamics (AMD) calculations [16][17][18], which predicted that the reflection-asymmetric α+ 16 O molecular structure becomes weaker as the spin goes up in this way that the equilibrium distance between the two clusters is gradually decreasing. This phenomenon is in contradiction to the common sense that rotation elongates nuclear shapes due to the centrifugal force.…”

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Anatomy of molecular structures in $^{20}$Ne

Zhou,

Yao,

et al. 2015

Preprint

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We present a beyond mean-field study of clusters and molecular structures in low-spin states of 20 Ne with a multireference relativistic energy density functional, where the dynamical correlation effects of symmetry restoration and quadrupole-octupole shapes fluctuation are taken into account with projections on parity, particle number and angular momentum in the framework of the generator coordinate method. Both the energy spectrum and the electric multipole transition strengths for low-lying parity-doublet bands are better reproduced after taking into account the dynamical octupole vibration effect. Consistent with the finding in previous studies, a rotation-induced dissolution of the α+ 16 O molecular structure in 20 Ne is predicted.

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confidence: 75%

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confidence: 99%

Anatomy of molecular structures in $^{20}$Ne

Zhou,

Yao,

et al. 2015

Preprint

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“…Secondly at the same time, the K" = 04 + band states can contain some components of the compact shell-structure configurations since the compact configurations are not fully occupied by the ground band states. Thus in spite of the dominant component of the well-developed a-16 0 di-nuclear structure, the highernodal K" = 04 + band is considered possibly to contain some transient nature in it.The transient character of the ground band states is expected by Nemoto et al110 l to be reflected also in the shell-structure excited band states with K"=02+. Many authors investigated the transient phenomena observed distinctly in the K" = 02 + and K" = 04 + bands.…”

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confidence: 82%

Chapter II. Comprehensive Study of Alpha-Nuclei

Fujiwara

Horiuchi

Ikeda

et al. 1980

Prog. Theor. Phys. Suppl.

378

393

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Downloaded from the self-conjugate 4n nuclei which we call a-nuclei are especially stable energetically, therefore the fragmentation (or fission) thresholds of respective nuclei into constituent a-nuclei plus a residual nucleus lie in series starting in the region of quite low excitation energy.Since a-nuclei are strongly bound systems, they are hardly excited even when two a-nuclei are in a close distance. The fact that inter-nucleus forces between spin-isospin saturated nuclei are generally weak promotes further the tendency that a-nuclei preserve their identity in their interaction process. Furthermore the repulsive force of a short range part of the inter-nucleus inter-at Purdue University Libraries ADMN on June 1, 2015 http://ptps.oxfordjournals.org/ Downloaded from factorily the low-lying positive-parity excited states, 02 + at 7.66 MeV and 22 + (or 08 + ?) at ,...__,10.3 MeV shown in Fig. 1-1.From these studies, the ground rotational band (consisting of ground 01 +, 2 1 + at 4.44 MeV and 41 + at 14.08 MeV) was regarded as having a strong shellmodel-like character, although a-clustering effect is important. The latter nature (namely the persistency of a-clustering) was investigated in detail by Abe, Hiura and Tanaka 17 l by the use of the molecular orbital method preserving the spatial symmetry of [ 4 8 ]. Takigawa and Arima 18 l investigated the *> Many works were made with various frameworks and a-a potentials. Here, however, we do not mention them in detail. See a review article given by Tamagaki and Fujiwara for the works on the 3a problem.••> at Purdue University Libraries ADMN on June 1, 2015 http://ptps.oxfordjournals.org/ Downloaded from 15 0, 15 N, 17 0 and 11 F, the spacing between the centroids of the p and the sd shells is estimated as about 17 MeV. ii) We can deduce a value of fiw = 13.4 MeV corresponding to the harmonic oscillator parameter b = 1.76 fm at Purdue University Libraries ADMN on June 1, 2015 http://ptps.oxfordjournals.org/ Downloaded from Another standpoint for incorporating a 4p-4h configuration was the weak coupling model by Arima, Horiuchi and Sebe 58 >• 59 >• 60 > which assumed that the at Purdue University Libraries ADMN on June 1, 2015 http://ptps.oxfordjournals.org/ Downloaded from at Purdue University Libraries ADMN on June 1, 2015 http://ptps.oxfordjournals.org/ Downloaded from *' The RGM study for the "O+a system was also carried out by Siinkel and Wildermuth."'l **l Similar RGM analysis of the "0-a interaction was made by Ando, Ikeda and Suzuki 106 J by comparing with the a-a and "0-16 0 cases. at Purdue University Libraries ADMN on June 1, 2015 http://ptps.oxfordjournals.org/ Downloaded from at Purdue University Libraries ADMN on June 1, 2015 http://ptps.oxfordjournals.org/ Downloaded from *> As for wi'lr(t), harmonic oscillator functions and locally peaked Gaussian functions are also available by the use of fPNLM(J., v, S). Actually, the latter functions were examined and were found to give the same results obtained by the set (2·5) (Ref. 41)). at Purdue University Lib...

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“…Furthermore another characteristic feature is the appearance of the higher rank molecule-like structure of the type of 12 C-8 Be or 12 C-2a at rather low excitation energy region below and around 10 MeV. Former characteristic feature was successfully investigated by the a-12 C-a model with linear arrangement by Nemoto, Yamamoto, Horiuchi, Suzuki and Ikeda 32 ) which is based on the 5a model and also by the extended shell model of Tomoda and Arima 83 J which is a hybridized model of the (sd) 4 shell model and the 16 0 +a cluster model.…”

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confidence: 99%

Chapter I. Introduction to Comprehensive Nuclear Structure Study Based on Cluster Correlations and Molecular Viewpoint

Ikeda

Horiuchi

Saitō

1980

Prog. Theor. Phys. Suppl.

157

178

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Contents § 1. Development of the studies based on the viewpoint presented in P. T.P. Supplement No. 52 § 2. Basic viewpoint of molecule-like structure in nuclei § 3. Comprehensive understanding on the structure of a-nuclei from the viewpoint of structure-change § 4. Various aspects of cluster correlations and cluster structure in non-anuclei § 5. Molecule-like structure in highly excited energy region § 6. Interaction between complex nuclei as composite particles § 7. Summary and future problems § 1. Development of the studies based on the viewpoint presented in P. T.P. Supplement No. 52As a basic correlation of the nuclear many-body system there exist cluster correlations by which various kinds of molecule-like structure are realized in wide regions of mass number and excitation energy. Consequently the molecule-like structure constitutes a fundamental form of existence and motion of nuclei, together with the shell-model-like structure. This viewpoint was presented in the Supplement No. 52n of the Progress of Theoretical Physics (abbreviated to P.T.P.).In the course of the progress of the successful studies by the nuclear shell model, the independent-particle picture was founded firmly, but at the same time it was recognized clearly that there exist in light nuclei groups of levels (ground or excited) with anomalous properties which were left outside the success of the shell model interpretations. These levels could not be 2 K. Ikeda, H. Horiuchi and S. Saito easily understood on the basis of the independent-particle picture. Another viewpoint different from the independent-particle one was needed for the understanding of these groups of levels. A basic viewpoint of the cluster correlation and molecule-like structure in nuclear system was formed through the accumulated studies aimed to understand the structure of these groups of levels. In P.T.P. Supplement No. 52, together with the presentation of the molecular viewpoint and with the historical background of investigations, there were reported the results of the theoretical studies which were necessary for the formation of the viewpoint and done under the research project of "Alpha-Like Four Body Correlations and Molecular Aspects in Nuclei" organized by the Research Institute for Fundamental Physics (abbreviated to RIFP) during 1968'" '--' 1971.The prospect 2 l that the molecule-like structure can appear in wide region of nuclei both in mass number and in excitation energy has promoted an extensive development of study of cluster structure in light nuclei. After the presentation of the molecular viewpoint in P.T.P. Supplement No. 52, two research projects were organized by RIFP; one was on "Study of Composite Particle Scattering by Microscopic Model" 3 l during 1972"'1973 and the other was on "Study of 20 Ne Region Nuclei with Transient Character from Shell-Structure to Molecular One"•l during 1973'" '--'1974. The former project aimed to develop the microscopic and semi-microscopic models which treat the relative motion and the interaction between clusters so ...

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Structure of Intrinsic States of K = 0+ Bands in 20Ne: Study of Transient Character

Cited by 26 publications

References 0 publications

Anatomy of molecular structures in $^{20}$Ne

Anatomy of molecular structures in $^{20}$Ne

Chapter II. Comprehensive Study of Alpha-Nuclei

Chapter I. Introduction to Comprehensive Nuclear Structure Study Based on Cluster Correlations and Molecular Viewpoint

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