ified studies of light neutron-excess system from bounds to continuum Makoto Ito artment of Pure and Applied Physics, Kansai Univers 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
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Unified studies of light neutron-excess systems from bounds to continuum Makoto Ito Department of Pure and Applied Physics, Kansai University I. Introduction.
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Unified studies of light neutron-excess systemsfrom bounds to continuum
Makoto Ito Department of Pure and Applied Physics, Kansai University
I. Introduction
II. Framework
III. Various structures in 12Be and Be isotopes
- Structural changes and Reaction dynamics in Be isotopes -
V. Summary and feature plan
IV. Enhancements induced by level crossing
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.
3H+p ~ 20 MeV
Cluster structures in 4N nuclei IKEDA Diagram
Ikeda’s Threshold rules
Be isotopes
Molecular Orbital : Itagaki et al,….
p―
s +
PRC61,62 (2000)
H.O. quanta N
<N> ± DN
~ 34.6 ± 5.9
Studies on Exotic Nuclear Systems in (Ex,N, Z,J) Space
( N,Z ) : Two Dimensions
Ex. e
nerg
yStructuralChangeLow-lying
Molecular Orbital : p ― 、 s +‥
Unbound Nuclear SystemsSlow RI beam
Decays inContinuum
Is Threshold Rule valid ??
N
1. Structures of 8 ~ 16Be2. Breakup of 10,12Be
Extension of microscopic cluster model (Test calculation for 10Be)
Unified model between M.O. and He clusters :PLB588 (04)
+ + ...
C1 C2 C3 =Y
0Pi (i=x,y,z) Coupled channels with Atomic orbitals
Mol. Orb. a 6He
Decay widhPTP113 (05)
a+6He Cross sectionsPLB636 (06)
10Be=a+a+N+N
ー i W(R)
S, Ci : Variational PRM.
S
5He 5HeCombine
Absorbing B.C. Scattering B.C. Tr. densites
10Be → a+6HeBreakup
<CL | r| MO>
Femto Molecules : 12Be=a+a+4N7He5He
6He
8He
6He
Ionic
Ionic
Atomic
01+
02+
Neutrons’ ex.
(p-)2(p-)2
(p-)2 (s+)2
(0pR)(0pL) (s+)2
05+
03+
04+
06+
a+8He ⇒ 6He+6HeCovalent
6He + 6He
a + 8He
Clusters’Relative ex.
Various structures are generated by excitation of a-a and neutron degree of freedom.
NN: Volkov No.2+G3RS
Be isotopes from bounds to continuums : Jp = 0+
8Be 10Be 12Be 14Be 16Be
Deformed states (Clusters)
Compact states (Shell model)Excitation of a- a rel. motion
xHe yHe
Level Crossings scheme in Be isotopes
Core-Core distance LargeSmall
A + B
C + D
Ener
gy
Compact( Normal )
Clusters( Intruder )
Internal States
AsymptoticStates
Level Crossing
We can discuss reaction dynamics inconnection to level crossing scheme.
a + 6Heg.s. 8Heg.s. + 6Heg.s.
10Be 14Be
Level Crossings in 12,14Be=a+a+XN (X=2,6)
(0p)2
(sd)2
(0p)4(sd)2
(0p)2(sd)4
Level Crossing
Level Crossing
Adiabatic surfaces (J p = 0+) Energy spectra ( J p = 0+ )