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
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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 )
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Drip line : predicted by HFB with SkM*Phys. Rev. C68, 054312.
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Nuclear Landscape
terra incognitaterra incognita
RIBF@RIKEN
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neutron skin neutron halo
radius
density
neutrons
protons
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Soft Dipole Mode
AMD calc., PRC71, 054602
Egg rotation?
Collective motion unique in unstable nuclei
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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
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deformation
continuum
pairing
self-consistency
RPA calculationfor unstable nuclei
RPA calculationfor unstable nuclei
Nobody made the code including all factors simultaneously.
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Deformation
THO+HFB+LN+PNPwith SkM* & mixed pairing
by M.V. Stoitsov et al.,Phys. Rev. C68, 054312.
prolate oblatetaken from wikipedia.org.
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RPA TDHF+ABC
16O
RPA vs. TDHF+ABC
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Isovector dipole strengths up to Ca isotopes
SkM*Rbox= 15 fm = 1 MeV
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16Ospherical
40Caprolate
Exp. data : Centre For Photonuclear Experiments Data
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18Oprolate
24Mgtriaxial
Exp. data : Centre For Photonuclear Experiments Data
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Extraction of peak position and width
Lorentzian Fitting
RPA Lorentzian
TDHF+ABC
16O
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Be Ne
SC
Mg
ArO Si
Peak position of IVGDR
Cal. vs. Exp.
14C
No clear relation betweenevolution of peak positionand deformation.
Ca
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Peak splitting by deformation
3D H.O. model
cf. Bohr-Mottelson, text book.
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Width Evolution of IVGDR
short axeslong axesshperical
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Soft Dipole Mode?
GDRpygmy
J. Gibelin, Ph. D thesis.
26Ne
P. Adrich et al., PRL 95, 132501
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Pygmy resonance in 132Sn
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Particle states in pygmy resonance
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26Ne
SkM*MeV
K=0K=1
Exp.
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Low-lying K=1 state
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Particle states in low-lying K=1 state
Neutron emission
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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 ?