Download presentation

Presentation is loading. Please wait.

Published byRamon Bierly Modified over 2 years ago

1
Unified studies of light neutron-excess systems from bounds to continuum Makoto Ito Department of Pure and Applied Physics, Kansai University I. Introduction II. Framework III. Various structures in 12 Be and Be isotopes － Structural changes and Reaction dynamics in Be isotopes － V. Summary and feature plan IV. Enhancements induced by level crossing

2
Molecular structures will appear close to the respective cluster threshold. α-Particle ⇒ building block Clustering phenomena is generated by a huge mixing of shell model configuration. 3 H+p ～ 20 MeV Cluster structures in 4N nuclei IKEDA Diagram Ikeda’s Threshold rules Be isotopes Molecular Orbital : Itagaki et al,…. ― ― + + PRC61,62 (2000) H.O. quanta N ± N ～ 34.6 ± 5.9

3
Studies on Exotic Nuclear Systems in (E x,N, Z,J) Space ( N,Z ) : Two Dimensions Ex. energy Structural Change Low-lying Molecular Orbital : ― 、 ＋ ‥ Unbound Nuclear Systems Slow RI beam Decays in Continuum Is Threshold Rule valid ?? N 1. Structures of 8 ～ 16 Be 2. Breakup of 10,12 Be

4
Extension of microscopic cluster model (Test calculation for 10 Be) Unified model between M.O. and He clusters :PLB588 (04) ++... C1 C2C3 0Pi (i=x,y,z) Coupled channels with Atomic orbitals Mol. Orb. 6 He Decay widh PTP113 (05) + 6 He Cross sections PLB636 (06) 10 Be= + +N+N ｰ i W(R) S, Ci : Variational PRM. S 5 He Combine Absorbing B.C.Scattering B.C.Tr. densites 10 Be → + 6 He Breakup

5
Femto Molecules ： 12 Be= + +4N 7 He 5 He 6 He 8 He 6 He Ionic Atomic 01+01+ 02+02+ Neutrons’ ex. (-)2(-)2 (-)2(-)2 ( - ) 2 ( + ) 2 (0p R )(0p L ) ( + ) 2 05+05+ 03+03+ 04+04+ 06+06+ + 8 He ⇒ 6 He+ 6 He Covalent 6 He + 6 He + 8 He Clusters’ Relative ex. Various structures are generated by excitation of - and neutron degree of freedom. NN: Volkov No.2+G3RS

6
Be isotopes from bounds to continuums : J = 0 + 8 Be 10 Be 12 Be 14 Be 16 Be Deformed states (Clusters) Compact states (Shell model) Excitation of - rel. motion x He y He

7
Level Crossings scheme in Be isotopes Core-Core distance LargeSmall A + B C + D Energy Compact ( Normal ) Clusters ( Intruder ) Internal States Asymptotic States Level Crossing We can discuss reaction dynamics in connection to level crossing scheme.

8
+ 6 He g.s. 8 He g.s. + 6 He g.s. 10 Be 14 Be Level Crossings in 12,14 Be= + +XN (X=2,6) (0p) 2 (sd) 2 (0p) 4 (sd) 2 (0p) 2 (sd) 4 Level Crossing

9
Adiabatic surfaces (J = 0 + ) Energy spectra ( J = 0 + ) ｰ i W(R) + 6 He(2 1 + ) GTCM + Absorbing Boundary Condition : PLB (2006) Cluster

10
S-matrices to continuums Smat.( Poles ← G.S.)Smat.( Conti.←G.S. ) Nuclea breakup : 10 Be + 12 C ⇒ 10 Be(0 + conti.) + 12 C (CDCC cal.) S-matrices to Poles 03+03+ 04+04+ 04+04+ 03+03+

11
Non-adiabatic tr. is main process. Reaction path in 10 Be → x He + y He Breakup reaction (Positive Parity) × 01+01+ 03+03+ 0 1 + → 0 3 + is the dominant transition. 10 Be(0 + ) → [ + 6 He(2 1 + ) ] 0 + Reaction Path in Breakup

12
Level Crossing in 12 Be (2) : breaking of N=8 magic number and level crossing Correlated AESsAESs with full coupling Coupling with all configurations Lowest minimum smoothly connected to + 8 He g.s. ⇒ Formation of adiabatic conjunction Conjunction G.S. ⇔ + 8 He + 8 He g.s. G.S. ( - ) 2 ( + ) 2 ( - ) 2 ( - ) 2 + 8 He g.s. [(0p) 6 ] [(0p) 4 (sd) 2 ] Correlation

13
Monopole transition of 12 Be Adiabatic transition is main process in monopole transition. ( - ) 2 ( + ) 2 8 He 01+01+ 03+03+ 0 1 + → 0 3 + is enhanced.

14
Contents of present report Results 1. Unified studies form bounds to continuums in Be isotopes Feature studies Extension to SD shell ⇒ O= + 12 C+XN 、 Ne= + 16 O+XN Generalities and Specialities : hybrid structures of clusters + excess neutrons in O and Ne 2. Reactions with large amplitudes in connection to adiabatic energy surfaces 1. There appears a wide variety of structures in excited states (Cluster + excess N) 2. Enhancements occur depending on the structures of AESs. 10 Be : Non-adiabatic path is dominant in monopole breakup. 12 Be : Adiabatic path is dominant in monopole breakup (breaking of N=8 magic). Recently, we have just succeeded in extending the model to general two centers.

Similar presentations

OK

Structure and Reactions of Exotic Nuclei PI32 Collaboration (theory group, but ….) Some conclusions (keywords)

Structure and Reactions of Exotic Nuclei PI32 Collaboration (theory group, but ….) Some conclusions (keywords)

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on ministry of corporate affairs india Ppt on good email etiquettes Ppt on north indian food Ppt on power sharing in democracy Esophagus anatomy and physiology ppt on cells Ppt on group discussion tips Ppt on youth leadership Ppt on trade fair supermarkets Ppt on anatomy of nervous system Ppt on event driven programming disadvantages