Advanced Nuclear Physics - nucl.phys.tohoku.ac.jp
Transcript of Advanced Nuclear Physics - nucl.phys.tohoku.ac.jp
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Advanced Nuclear Physics
Nuclear Theory Group,Tohoku UniversityKouichi Hagino
原子核理論特論
東北大学原子核理論研究室萩野浩一
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Contents
Nuclear Many-Body Problemswith strong interaction
(Low-energy) Nuclear Physics
to understand rich nature of atomic nuclei starting from nucleon-nucleon interactions
- size, mass, density, shape- excitations- decays- nuclear reactions
two kinds of particle: protons and neutrons
Nuclei: many-body systems of nucleons (protons and neutrons)
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Contents
Nuclear Many-Body Problems
Liquid drop modelSingle-particle motion and shell structureHartree-Fock approximationBruckner theoryPairing correlations and superfluid Nucleinucleosynthesis and physics of neutron-rich nucleiRandom phase approximation (RPA)Nuclear reactions and superheavy elements
(physics of Nihonium)
this lecture: microscopic descriptions of atomic nuclei
Nuclei: many-body systems of nucleons (protons and neutrons)
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References
Bohr-Mottelson Ring-Schuck Rowe Frobrich-Lipperheide
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Lecture notes:
http://www.nucl.phys.tohoku.ac.jp/~hagino/lecture.html
(Tohoku University → Physics → Nuclear Theory→ Kouichi Hagino → Lectures)
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Introduction: atoms and atomic nuclei
~ 50 cm
~ 10-10 m
cellsDNA
~ 10-8 m
atom
everything is made of atoms.
~ µm = 10-6 m
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Introduction: atoms and atomic nuclei
~ 50 cm
~ 10-10 m
cellsDNA
~ 10-8 m
atom
~ 10-15 m
atomic nucleus
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NuclearPhysics
Nucleus as a quantum many body system
charge mass (MeV) spin, parityProton +e 938.256 ½+
Neutron 0 939.550 ½+
Basic ingredients:
(note) n → p + e- + νe (10.4 min)
1 fm = 10-15 m
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protons
neutrons
Nucleons are not stopping inside a nucleus.(they move relatively freely)
a self-bound system
Yet, they are not completely independent.A nucleus keeps its shape while nucleons influence among themselves so that a nucleon does not escape.
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protons
neutrons
Nucleons are not stopping inside a nucleus.(they move relatively freely)
Yet, they are not completely independent.A nucleus keeps its shape while nucleons influence among themselves so that a nucleon does not escape.
a self-bound system
What happens if a photon is absorbed into a nucleus? - one nucleon simply starts moving faster?
photon
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protons
neutrons
Nucleons are not stopping inside a nucleus.(they move relatively freely)
Yet, they are not completely independent.A nucleus keeps its shape while nucleons influence among themselves so that a nucleon does not escape.
a self-bound system
What happens if a photon is absorbed into a nucleus? - one nucleon simply starts moving faster?
Very coherent motion can happen
Collective motions
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protons
neutrons
Nucleons are not stopping inside a nucleus.(they move relatively freely)
Yet, they are not completely independent.A nucleus keeps its shape while nucleons influence among themselves so that a nucleon does not escape.
a self-bound system
What happens if a photon is absorbed into a nucleus? - one nucleon simply starts moving faster?
Very coherent motion can happen
Collective motions
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a variety of motions→ very rich!
Very coherent motion can happen
Collective motions
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Nuclear Chart: 2D map of atomic nuclei
neutron number
proton number
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Periodic Table of elements (1869)
Mendeleev(1834-1907)
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Taka and Fuji (a grand -daughter of Mendeleev)
Periodic Table of elements (1869)
Mendeleev(1834-1907)
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Periodic Table of elements (1869)protons only, no information on neutrons
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Nuclear Chart: an extended version of periodic table
neutron number
proton number isotopes
16O (Z=8, N=8, A=16)17O (Z=8, N=9, A=17)18O (Z=8, N=10, A=18)
A=Z+N
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neutron number
proton number
・Stable nuclei in nature: 287 ・Nuclei artificially synthesized :about 3,000・Nuclei predicted:about 7,000 ~ 10,000
Nuclear Physics: Several static and dynamical propertiesof those nuclei
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neutron number
proton number how many neutrons can be attached?
what is the heaviest nucleus? what is the shape of nuclei?is there any exotic structure? how do nuclei decay?….. etc. etc.
Nuclear Chart: an extended version of periodic table
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neutron number
proton number how many neutrons can be attached?
what is the heaviest nucleus? what is the shape of nuclei?is there any exotic structure? how do nuclei decay?….. etc. etc.
Nuclear Chart: an extended version of periodic table
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Extension of nuclear chart: frontier of nuclear physics
neutron-rich nuclei (RIBF)
halo nuclei
9C 10C 11C 14C 15C 16C 17C 18C 19C 20C 22C12C 13C
12N 13N 16N 17N 18N 19N 20N 21N 22N 23N14N 15N
13O 14O 15O 16O 17O 18O 19O 20O 21O 22O 23O 24O
17F 18F 19F 20F 21F 22F 23F 24F 25F 26F 27F 29F 31F
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Neutron-rich nuclei (RIBF at RIKEN)
r-process nucleosynthesis
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October 17, 2017
NAOJ B.P. Abbott et al., PRL119 (‘17) 161101nucleosynthesis at this time?
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Ele.-mag. wave from the source of GW
solid lines:with r-processnucleosynthesis
dashed line:no r-process nucleosynthesis
http://www.cfca.nao.ac.jp/pr/20171016
M. Tanaka et al.,Astron. Soc. Jpn. 69 (‘17) 102
October 17, 2017
opac
ity
time
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neutron number
proton number how many neutrons can be attached?
what is the heaviest nucleus? what is the shape of nuclei?is there any exotic structure? how do nuclei decay?….. etc. etc.
Nuclear Chart: an extended version of periodic table
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Extension of nuclear chart: frontier of nuclear physicssuperheavy elements
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Prediction of island of stability: an important motivation of SHE study
Yuri Oganessian
island of stability around Z=114, N=184W.D. Myers and W.J. Swiatecki (1966), A. Sobiczewski et al. (1966)
nuclei in nature
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neutron number
proton number how many neutrons can be attached?
what is the heaviest nucleus? what is the shape of nuclei?is there any exotic structure? how do nuclei decay?….. etc. etc.
Nuclear Chart: an extended version of periodic table
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a nucleus is not always spherical
Quantum shape dynamics
「形の量子論」
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neutron number
proton number how many neutrons can be attached?
what is the heaviest nucleus? what is the shape of nuclei?is there any exotic structure? how do nuclei decay?….. etc. etc.
Nuclear Chart: an extended version of periodic table
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Density Distribution
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Density Distribution High energy electron scattering
Born approximation:
(Fourier transform of the density)
Form factor
e-
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Born approximation
θV(r)
incident flux:
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Electron scattering
Form factor
e- e-
* relativistic correction:
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Fermi distribution
(fm-3)(fm)
(fm)
Saturationproperty
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Momentum Distribution
Fermi gas approximation
kx
ky
kz
Fermi energy: (MeV)
(note: spin-isospin degeneracy)
ρ = 0.17 fm-3 kF ~ 1.36 fm-1
kF
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V
protons neutrons
~ 40 MeV(from Fermigas model)
~ 8.5 MeV(from expt.)
~ 48.5 MeV
A potential for nucleons inside a nucleus
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Discussion: Electron scattering
Form factor
e- e-
Why do cross sections decrease for an extended density distribution?
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Appendix
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x
V(x)Fermi gas model
EF (Fermi energy)
What is the relation between EF and the particle number?
→ Fermi gas model
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Fermi gas model
non-interaction many Fermion system (with no external potential)
0 L
put infinite walls at x = 0 and x = L:
xthree-dimensional case:
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Fermi gas model
nx
ny
nz
(1,1,1)(nx,ny,nz)
(2,1,1),(1,2,1)(1,1,2)
…..
N p
artic
les
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Fermi gas model
nx
ny
nz
(1,1,1)(nx,ny,nz)
(2,1,1),(1,2,1)(1,1,2)
…..
N p
artic
les
EF
the highest energy:
nF
nF
nF
nF
nx, ny, nz > 0
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Fermi gas model
nx
ny
nz
the highest energy:
nF
nF
nF
nF
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Fermi gas model
or
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Fermi gas model
total energy
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Fermi gas model
nx
ny
nz
(1,1,1)(nx,ny,nz)
(2,1,1),(1,2,1)(1,1,2)
…..
N p
artic
les
EF
nF
nF
nF
nF