systematic study of isovector dipole mode up to a=50
DESCRIPTION
稲倉恒法 中務孝 矢花一浩. ( 筑波大学 ) ( 理研 ) ( 筑波大学 ). Systematic study of isovector dipole mode up to A=50. KEK 研究会「原子核・ハドロン物理 : 横断研究会」 KEK, 2007 年 11 月 19 日 -21 日. Drip line : predicted by HFB with SkM* Phys. Rev. C68, 054312. Nuclear Landscape. terra incognita. RIBF@RIKEN. density r. neutrons. - PowerPoint PPT PresentationTRANSCRIPT
Systematic study ofisovector dipole mode
up to A=50
Systematic study ofisovector dipole mode
up to A=50
KEK 研究会「原子核・ハドロン物理 : 横断研究会」KEK, 2007 年 11 月 19 日 -21 日
稲倉恒法中務孝
矢花一浩
( 筑波大学 )( 理研 )
( 筑波大学 )
Drip line : predicted by HFB with SkM*Phys. Rev. C68, 054312.
Nuclear Landscape
terra incognitaterra incognita
RIBF@RIKEN
neutron skin neutron halo
radius
density
neutrons
protons
Soft Dipole Mode
AMD calc., PRC71, 054602
Egg rotation?
Collective motion unique in unstable nuclei
Systematic calculation of excited states
Systematic analysis of various observables. Natures in stable region will change ?
Collective motion unique in unstable nuclei
Exist or not ? Which nucleus ? Microscopic description ?
Motivation
deformation
continuum
pairing
self-consistency
RPA calculationfor unstable nuclei
RPA calculationfor unstable nuclei
Nobody made the code including all factors simultaneously.
Deformation
THO+HFB+LN+PNPwith SkM* & mixed pairing
by M.V. Stoitsov et al.,Phys. Rev. C68, 054312.
prolate oblatetaken from wikipedia.org.
RPA TDHF+ABC
16O
RPA vs. TDHF+ABC
Isovector dipole strengths up to Ca isotopes
SkM*Rbox= 15 fm = 1 MeV
16Ospherical
40Caprolate
Exp. data : Centre For Photonuclear Experiments Data
18Oprolate
24Mgtriaxial
Exp. data : Centre For Photonuclear Experiments Data
Extraction of peak position and width
Lorentzian Fitting
RPA Lorentzian
TDHF+ABC
16O
Be Ne
SC
Mg
ArO Si
Peak position of IVGDR
Cal. vs. Exp.
14C
No clear relation betweenevolution of peak positionand deformation.
Ca
Peak splitting by deformation
3D H.O. model
cf. Bohr-Mottelson, text book.
Width Evolution of IVGDR
short axeslong axesshperical
Soft Dipole Mode?
GDRpygmy
J. Gibelin, Ph. D thesis.
26Ne
P. Adrich et al., PRL 95, 132501
Pygmy resonance in 132Sn
Particle states in pygmy resonance
26Ne
SkM*MeV
K=0K=1
Exp.
Low-lying K=1 state
Particle states in low-lying K=1 state
Neutron emission
Summary
Fully self-consistent deformed RPA calculation.
Systematic study up to Ca isotopes. underestimate peak position of IVGDR. peak splitting by deformation. width evolution.
Applied to low-lying dipole modes in 132Sn and 26Ne. soft dipole mode in 132Sn. soft dipole mode + neutron emission in 26Ne ?