Cluster Models for Light Nuclei
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1 Cluster Models for Light Nuclei N. Itagaki, T. Otsuka, University of Tokyo S. Aoyama, Niigata University K. Ikeda, RIKEN S. Okabe, Hokkaido University
2 Purpose of the present study Cluster model explore exotic structure and intruder states, but the interactions used are simple Just in between, we would like to make a model for light neutron-rich nuclei, which has the model space to express the exotic states, and the interaction used is an effective one but the nature of the original nuclear force is well-reflected. GFMC, NCSM Ab initio and honest calculations
3 Outline of the talk Apply the cluster model to neutron-rich side. Using the Molecular-orbit (MO) approach, what kind of physics can be discussed? (4 examples) Improve the cluster model (model space and interactions) * cluster-shell competition can be discussed * direct treatment of the tensor contribution
4 The MO approach in nuclear physics Molecular Viewpoints in Nuclear Structure J.A. Wheeler, Physical Review 52 (1937) Applied to 9 Be in 1973 Y. Abe, J. Hiura, and H. Tanaka, P.T.P. 49 (application of LCAO-SCF method to nuclear systems) Systematic Analyses of the Be isotopes M. Seya, M. Kohno, and S. Nagata, P.T.P. 65 (1981) - and -orbits are described as linear combination of p-orbits (Gaussian around each -cluster with zero distance)
5 Molecular-Orbit is one bridge for the Cluster model to neutron-rich nuclei
6 Our Extension of the Model Space p-orbits around each -cluster is described as the linear combination of shifted Gaussians Spatial distribution of each neutron depends on the orbit. The coefficients for the linear combination is optimized Deviation from pure MO Spin-triplet contribution to the ( ) 2 is included Lowering of the intruder ( ) 2 configuration by several MeV Breaking of N=8 magic number in 12 Be
7 Hamiltonian 2-body effective interaction
8 N. Itagaki and S. Okabe, PRC61 (2000) 2 + n+n model for 10 Be
9 N. Itagaki, S. Okabe, K. Ikeda, PRC62 (2000) N model for 12 Be
10 Triaxial deformation of 10 Be ( n n) If the two valence neutrons perform independent particle motions charge distribution is still axial symmetric If di-neutron correlation becomes important Triaxial defomation inter-band transition Davydov-Filiipov model
11 N. Itagaki, S. Hirose, T. Otsuka, Okabe, and K. Ikeda, PRC65 (2002)
12 Triaxial (SU(3)) single particle-like (JJ)
13 Equilateral triangular shape of 3 D 3h symmetry K =0 +, 3 - rotational bands are possible 12 C 3 - at 9.6 MeV 4 -, 5 - have not been observed above the -threshold
14 N. Itagaki, T. Otsuka, K. Ikeda, and S. Okabe, PRL 94 (2004) Alpha threshold Energy level of 14 C
15 N. Itagaki, T. Otsuka, K. Ikeda, and S. Okabe, PRL 04 (2004) Alpha threshold Energy level of 14 C
16 Phase of nuclei Excitation energy Alpha-condensation (gas) threshold Cluster crystallization (solid) mean-field-like (liquid)
17 Now we extend the cluster model and include the cluster-shell competition due to the spin-orbit interaction
18 Antisymmetrized Molecular Dynamics (AMD) (H. Horiuchi et al.) Single-particle wave function Slater determinant A [( 1 1 )( 2 2 )( 3 3 ) ] Projection of parity and angular momentum P J P
19 AMD cooling equation AMD triple-s cooling equation
20 Antisymmetrized Molecular Dynamics (AMD) has been proposed to express this effect, but the single Slater determinant is not enough to express the quantum mechanical mixing of shell-like structure and cluster-like structure We superpose many AMD wave function We use the idea of Stochastic Variation Method Suzuki, Varga for the selection of the basis
21 + Snapshot 1 Snapshot 2 + Snapshot 3 Superposition of Selected Snapshots (AMD SSS) N. Itagaki and S. Aoyama, PRC68 (2003)
22 N. Itagaki and S. Aoyama, PRC68 (2003) Density distribution of 6 He ( +n+n)
23 We prepare - (3, 4, 5 fm) and add +p+p+n+n model space The squared overlap between the first 3 basis (cluster) and the final state is 0.91 Cluster structure survives 8 Be 0 + state
24 12 C 0 + energy convergence
25 Formation of 12 C in starts decay decay 12 C B(E2) present exp. 3 model All units are e 2 fm 4
26 Nuclear chart of cluster-shell competition
27
28
29 Very small B(E2) value! B(E ) = 0.63 e 2 fm 4 Preliminary result of the present calculation B(E ) 0.1 e 2 fm 4 (protons) B(E ) 5.4 e 2 fm 4 (neutrons) 2 + state has mainly neutron-excitation configuration? <I E2 F> = <p E2 p><n n> No conclusion for the deformation of the protons
30 Conclusion Cluster model explore exotic structure and intruder states, but the interactions used are simple * MO model is one way to extend the cluster models to neutron-rich side. * Using AMD SSS, we can discuss the cluster-shell competition. * Refinement of the interaction has just started and Tensor can be directly treated. GFMC, NCSM Ab initio and honest calculations
Title. Author(s)Itagaki, N.; Oertzen, W. von; Okabe, S. CitationPhysical Review C, 74: Issue Date Doc URL. Rights.
Title Linear-chain structure of three α clusters in 13C Author(s)Itagaki, N.; Oertzen, W. von; Okabe, S. CitationPhysical Review C, 74: 067304 Issue Date 2006-12 Doc URL http://hdl.handle.net/2115/17192
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