Modern Theory of Nuclear Structure, Exotic Excitations and Neutrino-Nucleus Reactions N. Paar...
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![Page 1: Modern Theory of Nuclear Structure, Exotic Excitations and Neutrino-Nucleus Reactions N. Paar Physics Department Faculty of Science University of Zagreb.](https://reader036.fdocuments.us/reader036/viewer/2022070305/5514cb1d550346935c8b4b43/html5/thumbnails/1.jpg)
Modern Theory of Nuclear Structure, Exotic Excitations and Neutrino-Nucleus ReactionsModern Theory of Nuclear Structure, Exotic Excitations and Neutrino-Nucleus Reactions
N. PaarN. Paar
Physics DepartmentPhysics Department
Faculty of ScienceFaculty of Science
University of ZagrebUniversity of Zagreb
CroatiaCroatia
www.phy.hr/~npaarwww.phy.hr/~npaar
Modern Theory of Nuclear Structure, Exotic Excitations and Neutrino-Nucleus ReactionsModern Theory of Nuclear Structure, Exotic Excitations and Neutrino-Nucleus Reactions
Modern Theory of Exotic Nuclear Structure: Excitations, Weak Interaction Rates and
Beyond
Modern Theory of Exotic Nuclear Structure: Excitations, Weak Interaction Rates and
Beyond
NuPECC Meeting, Zagreb, 13.-14.6.2008.
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BEYOND THE MEAN FIELD
Transitions between spherical and axiallydeformed shapes
RMF+GCM
DESCRIPTION OF NUCLEAR QUANTUM PHASE TRANSITIONS
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COLLECTIVE EXCITATIONS IN NUCLEI: GIANT RESONANCES
IVGDR
ISGMR
Self-consistent description of excitations : relativistic quasiparticle random phase approximation (RQRPA)
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EXOTIC MODES OF EXCITATION IN NUCLEI
→ REVIEW: Paar, Vretenar, Khan, Colò, Rep. Prog. Phys. 70, 691 (2007).
exotic nuclei are characterized by weak binding of outermost nucleons, diffuse neutron densities, formation of the neutron skin and halo
effect on multipole response → new exotic modes of excitation
Among the low-lying states, a single state has more distributed structure composed of many transitions from weakly bound neutron orbitals
Among the low-lying states, a single state has more distributed structure composed of many transitions from weakly bound neutron orbitals
PYGMY DIPOLE RESONANCE (PDR)
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PYGMY DIPOLE RESONANCES AND NEUTRON SKIN
● Adrich et al., PRL 95, 132501(2005).
Klimkiewicz, Paar, et al. PRC 76, 051603(R) (2007)
Result (averaged 130,132Sn) :
a4 = 32.0 ± 1.8 MeV
...)(18
)(
),(
2
1)(
202
0
002
0
04
02
2
2 |
Kpa
ES
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LAND
Sn isotopes
A.Krasznahorkay et al.
PRL 82(1999)3216
PYGMY DIPOLE RESONANCES AND NEUTRON SKIN
Rn – Rp :
130Sn: 0.23 ± 0.04 fm
132Sn: 0.24 ± 0.04 fm
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EXOTIC MODES TOWARDS THE PROTON DRIP-LINE
PROTON PYGMY DIPOLE RESONANCE
PROTON PYGMY DIPOLE RESONANCE
Proton PDR is composed from transitions of weakly bound protons including those which are bound only due to the Coulomb barrier
Centroid energy and B(E1) for low-lying states
Centroid energy and B(E1) for low-lying states
Paar, Vretenar, Ring, Phys. Rev. Lett. 94, 182501 (2005)
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NEUTRINO-NUCLEUS REACTIONS
ZXN
0+ 1+
1-
2+3-
2-
0+
Z+1XN-1
E
RQRPA amplitudes RHB occupation probabilities
Reduced matrix elements for the neutrino-nucleus cross section:
Possible extrapolations towards exotic nuclei relevant for astrophysics without any adjustments of interaction parameters
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RHB+RQRPA
DISTRIBUTION OF CROSS SECTIONS OVER MULTIPOLARITIES
The knowledge onspin-dipole excitations and higher multipolaritiesis essential for reliabledescription of neutrinonucleus cross sections!
Paar, Vretenar, Marketin, Ring Phys. Rev. C 77, 024608 (2008)
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e-NUCLEUS CROSS SECTIONS AVERAGED OVER NEUTRINO FLUX
e FLUX
Experimentalflux of neutrinos obtained from + decay at rest
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(νμ,μ-)
<σ>(10-40cm2)
RPA(Volpe et al.) 19.23
QRPA(Volpe et al.) 20.29
CRPA(Kolbe et al.) 18.18
PN-RQRPA 10.97
EXP.(LSND) 12±0.3±1.8
MUON NEUTRINO CAPTURE, EXOTIC ATOMS, …
Self-consistent description of muon atom:
FLUX
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Supernova neutrino flux:
Cross section averaged over Supernova neutrino flux
CROSS SECTIONS FOR SUPERNOVA NEUTRINOS
2 4 6 8 10 T[MeV]
4
3
2
1
0
5
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Unified description of the structure of stable and nuclei far from stability, and reliable extrapolations toward the drip lines
CONCLUDING REMARKS
www.phy.hr/~npaar
When extended to take into account the most important correlations, it describes deformations and shape-coexistence phenomena associated with shell evolution
Insight into dynamics of exotic modes of excitation, neutrino-nucleus reactions, weak interaction rates of relevance for nuclear astrophysics
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T. Nikšić, T. Marketin, D. Vretenar, Zhipan-LiUniversity of Zagreb, Croatia
G. A. LalazissisAristotle Universtity of Thessaloniki, Greece
P. RingTechnische Universitaet Muenchen, Germany
G.ColòUniversità degli Studi and INFN, Milano, Italy
E. KhanIN2P3-CNRS/Université Paris-Sud, Orsay, France