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微視的核構造反応模型を用いた 9 Li 原子核の励起状態の研究 古本 猛憲 ( 一関工業高等専門学校 ) 共同研究者 須原唯広 ( 松江工業高等専門学校 ) 板垣直之 ( 京都大学基礎物理学研究所 ) RCNP 研究会「核子・ハイペロン多体系におけるクラスター現象」 (7 月 26,27 日, 2013.

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Presentation on theme: "微視的核構造反応模型を用いた 9 Li 原子核の励起状態の研究 古本 猛憲 ( 一関工業高等専門学校 ) 共同研究者 須原唯広 ( 松江工業高等専門学校 ) 板垣直之 ( 京都大学基礎物理学研究所 ) RCNP 研究会「核子・ハイペロン多体系におけるクラスター現象」 (7 月 26,27 日, 2013."— Presentation transcript:

1 微視的核構造反応模型を用いた 9 Li 原子核の励起状態の研究 古本 猛憲 ( 一関工業高等専門学校 ) 共同研究者 須原唯広 ( 松江工業高等専門学校 ) 板垣直之 ( 京都大学基礎物理学研究所 ) RCNP 研究会「核子・ハイペロン多体系におけるクラスター現象」 (7 月 26,27 日, 2013 at 関東学院大学 KGU 関内メディアセンター )

2 Contents Motivation - The 9 Li nucleus has a role of the core in 11 Li - Structures of the 9 Li nucleus Formalism - Stochastic Multi-configuration mixing Method - Microscopic Coupled Channel (MCC) Method with complex G-matrix interaction (CEG07) Results - Elastic & Inelastic cross sections - Discussion for the second 3/2 - state Summary

3 6 Li Halo structure 6 He 8B8B 11 Be Motivation I. Tanihata et. al., (Phys. Rev. Lett. 55 (1985) 2676) T. Minamisono et. al., (Phys. Rev. Lett. 69 (1992) 2058) I. Tanihata, (J. Phys. G: Nucl. Part. Phys. 22 (1996) 157) 4 He 8 He Z=2 Z=3 Z=4 Z=5 N=2 7 Be 9 Be 10 Be 7 Li 8 Li 9 Li 11 Li 12 Be N=3 N=4N=5N=6N=7N=8 9B9B 10 B 11 B 12 B 13 B 7 Be + p 10 Be + n 9 Li + n + n 4 He + n + n Experiment

4 Importance role of the core excitation for the nuclear reaction 8 B elastic scattering Motivation A. M. Moro et. al., (Phys. Rev. C.85 (2012) )K. Horii et. al., (Phys. Rev. C.81 (2010) (R)) Break up of 11 Be → 10 Be + n 11 Li has a halo structure 9 Li itself in this study

5 α n1n1 t n2n2 9 Li Brink model + Stochastic multi-configuration mixing Hamiltonian Central : Volkov No.2 (W=1-M, M=0.6, B=H=0.08) LS : G3RS (V LS =2000MeV) Randomly fixed Effective NN interaction Z Formalism (Structure)

6 Energies & rms radii & B(E2) [7] No-core shell model [8] TOSM + UCOM [9] α + t + n + n [11] 6 He + t T. Furumoto, T. Suhara, and N. Itagaki (Phys. Rev. C.87 (2013) ) B(E2; 1/2 - → 3/2 - ) Exp. 6.8(3) e 2 fm 4 Cal e 2 fm 4

7 Microscopic Coupled Channel (MCC) The diagonal and coupling potentials are derived from microscopic view point. Transition density R r1r1 r2r2 v NN (s) Projectile Target transition density CEG07 Formalism (Reaction)

8 Quasi-elastic 9 Li + 12 C cross section In MCC with CEG07 to reproduce the data T. Furumoto, T. Suhara, and N. Itagaki (Phys. Rev. C.87 (2013) )

9 Elastic & Inelastic cross sections T. Furumoto, T. Suhara, and N. Itagaki (Phys. Rev. C.87 (2013) )

10 Decomposition into monopole & quadrupole transitions Quadrupole Monopole T. Furumoto, T. Suhara, and N. Itagaki (Phys. Rev. C.87 (2013) )

11 Mutual-excitation and multistep effects T. Furumoto, T. Suhara, and N. Itagaki (Phys. Rev. C.87 (2013) ) ✔ Mutual-excitation ( 12 C * ) effect ✔ Multistep ( 9 Li * ) effect Minor role for all 3/2 - states Drastic change of the 3/2 2 - state Minor role for other 3/2 - states

12 Second 3/2 - state shows exotic behavior in the inelastic angular distribution Need for the investigation of the state in detail

13 Decomposition into K-quantum number α n1n1 t n2n2 9 Li Z K = 1/2 only K = 3/2 only T. Furumoto, T. Suhara, and N. Itagaki (Phys. Rev. C.87 (2013) )

14 Exp (9) efm 2 T. Furumoto, T. Suhara, and N. Itagaki (Phys. Rev. C.87 (2013) ) Deformation of 9 Li In the assumption, all Q 0 gives positive values In the collective model Prolate like deformation K = 1/2 only K = 3/2 only

15 T. Furumoto, T. Suhara, and N. Itagaki (Phys. Rev. C.87 (2013) ) Behavior of two valence neutrons in 9 Li α n t n 9 Li α n n 10 Be α Analogy α + t + di-neutron α + α + di-neutron

16 Multi-step effect T. Furumoto, T. Suhara, and N. Itagaki (Phys. Rev. C.87 (2013) )

17 Summary Application of microscopic cluster and microscopic folding modes to 9 Li nuclear scatterings The multi-step coupling effect - important for the 2 nd 3/2 - state - through the 1 st 1/2 - and 5/2 - states Inelastic cross section to the 3/2 - state - Quadrupole transition for the 2 nd 3/2 - state - Monopole transition for the 3 rd and 4 th 3/2 - states Possibility in the 2 nd 3/2 - state - triaxial deformation & mixing of di-neutron components


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