Nuclear Structure

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Nuclear Structure
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UCA
USAL
UB
IEM-CSIC
UAM
UIB
UCM
IFIC-UV
UHU
USE
UMU
UGR
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• NUCLEAR STRUCTURE
• Universidad Autónoma de Madrid
• Universidad Complutense. Madrid.
• Instituto de Estructura de la Materia CSIC,
  Madrid
• Universidad de Sevilla
• Universidad de Huelva
• Universitat de Barcelona
• Universidad de Cantabria
• Universidad de Granada

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Nuclear Structure
RESEARCH TOPICS

• Algebraic models phase transitions
• Chaos in nuclei
• Large shell model calculations
• RPA correlations
• Relativistic Mean Field
• Self-consistent (deformed) mean field and beyond
• Few-body systems
• Shape coexistence,
• Microscopic calculations in nuclear matter
• Symmetry energy
• Nuclear Astrophysics
• Electron scattering

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SUMMARY

• Nuclear Structure and Reactions
• UAM, IEM, UCM, USE, UGR, UCA, UB,
• Hadronic/Intermediate Energies
• USAL, IFIC-UV, UGR, UB, UCM, USE,

Close collaboration with experimental facilities
and groups BNL, RHIC, JLAB, KEK,
Daphne-Frascati, MAMI-Mainz, ELSA-Bonn, GSI-FAIR,
etc.

• 12 Research Groups 60 staff researchers
  40-50 (RyC, JdC,) PhD students
• 9 PhD Thesis (2010/11) UB, IEM-CSIC, UCM, UGR,
  USE

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GRUPO FÍSICA NUCLEAR TEÓRICAIEM-CSIC, MADRID
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Sistemas de tres cuerpos en el continuo
Estructura y reacciones
(E. Garrido, R. de Diego, C. Romero)

• Resonancias y modos de desintegración
• Resolución de las ecuaciones de Faddeev en el
  espacio de coordenadas
• Aplicación del método de rotación compleja para
  obtener simultáneamente los estados ligados y las
  resonancias del sistema
• PRC 79 (2009) 054009, PLB 684 (2010) 132, PRC 82
  (2010) 034001

• Reacciones a muy baja energía
• Desarrollo de relaciones integrales para extraer
  la matriz S de la reacción a partir de la parte
  interna de la función de onda
• Aplicación a átomos ultrafríos
• PRL 103 (2009) 090402, PRC 81 (2010) 034002, PRA
  83 (2011) 022705

• Procesos de captura radiativa
• Aplicación de las técnicas de tres cuerpos al
  estudio de reacciones de interés astrofísico
• Reacción triple alfa y tasa de producción de 12C
  en el medio estelar
• JPG 37 (2010) 064027, EPL 90 (2010) 52001, JPG 37
  (2010) 115105, EPJA 47 (2011) 102

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FNT IEM CSIC Madrid (P. Sarriguren)

• Electroweak Processes in Nuclei
• ( UCM E. Moya, J.M. Udías, O. Moreno)
• JPG37, 064019 (2010) PRC81, 041303(R) (2010)
  PRC81, 064314 (2011)
• PRC83, 025801 (2011) PRC84, 054311 (2011)
  PRC84, 034316 (2011)
• NIMA 637, 60 (2011) PRC85, 064319 (2012)
• Electron scattering from exotic nuclei
• Parity violating electron scattering (Neutron
  distributions. Neutron skins)
• Beta decay and GT strength (Nuclear Structure
  Nuclear deformation Astrophysics Weak decay
  rates for r, rp processes Particle Physics
  Double beta decay)

• Structural evolution from Gogny-HFB
  calculations
• ( UAM L.M. Robledo Rice Univ. Texas R.
  Rodríguez-Guzmán)
• PRC81, 024310 (2010) PLB691, 202 (2010) PRC82,
  044318 (2010) PRC82, 061302(R) (2010) PRC83,
  014309 (2011) PRC83, 044307 (2011) PRC83,
  054303 (2011) PRC84, 054316 (2011) PRL108,
  062701 (2012) PRC86, 014321 (2012)
• Microscopic justification of critical point E(5)
  and X(5) symmetries
• Onset of nuclear deformation (Axial and triaxial
  shapes)
• Experimental signatures of shape transitions
• Mappings to IBM Hamiltonians

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GRUPO FÍSICA NUCLEARUNIVERSIDAD COMPLUTENSE
MADRID
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Nuclear Physics Group GFN-UCM
(Complutense University Madrid)?
Members Permanent JMG Gómez, E. Moya de
Guerra, J. Retamosa, J.M. Udías, MC Martínez, E.
Faleiro, R. Álvarez-Rodríguez (UPM based)
Postdocs C. Fernández-Ramírez (JdlC), A. Relaño
(Lecturer), L. Muñoz (Assistant Lecturer), O.
Moreno (Assistant Lecturer), M. Ivanov (Visiting
scientist)
Main Collaborations IEM-CSIC, MIT, Torino, JLab,
Mainz, Sofia
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UNIVERSIDAD COMPLUTENSE MADRID

• Gamow-Teller strength distributions and beta
  half-lives in the lead region.
• Two-neutrino double-beta decay matrix elements.
• Parity-violation asymmetry in electron-nucleus
  scattering and its relation to neutron
  distribution (PREX exp.).
• Analysis of beta-decay electron spectrum in a
  search for keV sterile neutrinos as dark matter
  candidates (MARE KATRIN exp.).
• Nuclear structure studies with the (e,ep)
  reaction spectroscopic factors in 16O ,208Pb,
  12C, 207Tl.
• Nuclear structure effects in neutrino-nucleus
  reactions

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Power spectrum of nuclear levels with missing
levels and mixed symmetries
Measure fluctuations
Obtain Power spectrum
RMT result
1/f noise
Uncorrelated levels
1/f2 noise
If our spectra are incomplete or we mix
symmetries we have something in between 1/f and
1/f2
J3 and J4 states mixed (full circles) and
non-mixed (open circles)
0.8 fraction of all J0-8 states mixed (full
circles) and non-mixed (open circles)
Examples with shell model results for 24Mg We
can fit the fraction of missing levels and the
number of mixed symmetries
R.A. Molina, J. Retamosa, L. Muñoz, A. Relaño, E.
Faleiro, Phys. Lett. B 644, 25 (2007)
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GRUPO FÍSICA NUCLEARUNIVERSIDAD AUTÓNOMA MADRID
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Theoretical highlights

• Collective nuclei motion (superdeformation,
  superfluidity, etc.)
• Structure of exotic nuclei and weak interactions
• Neutrinoless double beta decay

significant computational advanceinvolving
matrix dimensions reaching ten billionin
shell-model calculations.
 Island of inversion around 64Cr S. M. Lenzi, F.
Nowacki, A. Poves, and K. Sieja Phys. Rev. C 82,
054301 (2010)
Self-consistent mean field and beyond

• Nuclear properties described with an universal
  density-dependent force and state of the art
  beyond mean-field calculations
• Configuration mixing techniques symmetry
  restored wave functions
• Applications subshell closures, shape
  coexistence, transition probabilities, etc.

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GRUPO FÍSICA NUCLEAR BÁSICAUNIVERSIDAD DE SEVILLA
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GRUPO ESTRUCTURA NUCLEAR
Phase transitions in quantum many-body systems
within algebraic models Given two hamiltonians
H1 and H2 that describe different system
structures, a transitional hamiltonian can be
constructed as H x H1 (1-x) H2 A QPT occurs
at some critical value of the control parameter x
that controls the relative weight of H1 and
H2 Algebraic models are very well suited to
study such hamiltonians since in that case H1
and H2 correspond to different dynamical
symmetries. QPT's in boson, fermion and mixed
systems can be studied.

• TOPICS (2011)
• Nuclei (collaboration with Padova and Huelva)
• - odd-even nuclei and critical point symmetries
  within IBFA.
• - effect of three-body terms within the IBA.
• Molecules (collaboration with Huelva)
• - finite size N effects in molecular systems
  within the vibron model.
• Lipkin model (collaboration with Huelva and CSIC
  Madrid)
• - phase transitions in excited states and its
  connection with quantum decoherence.
• Dicke model (collaboration with CSIC Madrid,
  Huelva and Prague)
• - phase transitions in excited states and the
  connection with quantum chaos.

P. Pérez-Fernández et al. Phys. Rev. E 83. 2011,
046208 Phys. Rev. A2011, 062125 J. Phys. Conf.
Ser. 284. 2011, 012049. L. Fortunato et al.,
Int. J. Mod. Phys. 20. 2011, 207J. Barea Muñoz
et al., Phys. Rev. C83. 2011, 024307 L.
Fortunato et al., Phys. Rev. C84, 2011, 014326
P. Pérez-Fernández et al., Phys. Rev. A83, 2011,
033802
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GRUPO ESTRUCTURA MATERIAUNIVERSIDAD DE HUELVA
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1. Estudio de la coexistencia de forma en el
Pt. J.E. García-Ramos, V. Hellemans y K. Heyde,
PRC 84, 014331 (2011).
2. Triaxialidad en el IBM usando una interacción
quadupolar bosónica a tres cuerpos L. Fortunato,
C.E. Alonso, J.M. Arias, J.E. García-Ramos y A.
Vitturi, Phys. Rev. C 84, 014326 (2011)
3. Estudio de caos cuántico y quantum quentch
en sistemas de interés en óptica cuántica. P.
Pérez-Fernández, P. Cejnar, J.M. Arias, J.
Dukelsky, J.E. García Ramos y A. Relaño, Phys.
Rev. A 83, 033802 (2011). P. Pérez-Fernández, A.
Relaño, J.M. Arias, J. Dukelsky, J.E. García
Ramos y Phys. Rev. E 83, 046208 (2011).
4. Correcciones de tamaño finito en el punto
crítico de un Hamiltoniano del modelo vibrónico
U(3). P. Pérez-Fernández, J.M. Arias, J.E.
García-Ramos y F. Pérez-Bernal, Phys. Rev. A 83.
062125 (2011). F. Pérez-Bernal, O. Alvarez-Bajo,
J.M. Arias, M.Carvajal, J.E.García-Ramos,
D.Larese y P. Pérez-Fernández, Journal of
Physics Conference Series 284 (2011) 012049.
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GRUPO FÍSICA NUCLEARUNIVERSIDAD DE GRANADA
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Activity in Granada (2011-2012)Theory
M. Anguiano, G. Co, V. De Donno and A.M. Lallena
(collaboration Granada-Lecce) Self-consistent
Hartree-Fock, continuum RPA and HFBCS, with
finite range interactions including tensor and
spin-orbit terms Self-consistent continuum RPA
calculations with finite-range interactions
Phys. Rev. C 83 (2011) 044324 Tensor
effective interaction in self-consistent RPA
calculations Phys. Rev. C 83 (2011)
064306 Self-consistent continuum RPA
calculations of 4He electromagnetic responses
Phys. Rev. C 84 (2011) 037306 Mean-field
calculations of exotic nuclei ground states
Phys. Rev. C 85 (2012) 024322 Magnetic
excitations in nuclei with neutron excess Phys.
Rev. C 85 (2012) 034323 Nuclear proton and
neutron distributions in the detection of weak
interacting massive particles JCAP
accepted Tensor and tensorisospin terms in
the effective Gogny interaction submitted to
PRC Nuclear properties with finite range
interactions in HFBCS in preparation
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Activity in Granada (2011-2012)Theory

• Atomic structure and correlations
• (Buendía, Gálvez, Sarsa, Maldonado)
• Relativistic, numerically parameterized,
  optimized, effective potentials for the ground
  state of the atoms He through Ra
• At. D. Nuc. D. Tab. 97 (2011) 109-133
• Relativistic quantum similarities in atoms in
  position and momentum spaces
• Physics Letters A 375 (2011) 2544-2549
• Jastrow correlated and quantum Monte Carlo
  calculations for the low lying states of the
  carbon atom J. Chem. Phys. 134 (2011) 134102
• Quantum Monte Carlo and Fermions
• (Arias de Saavedra, Kalos, Pederiva)
• Cancellation time for correlated random walkers
  Mol. Phys. DOI10.1080/00268976.2011.604647

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GRUPO FÍSICA NUCLEARUNIVERSIDAD CANTABRIA
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Modelos relativistas de estructura nuclear

• Grupo (3 doctores) M. López-Quelle, R. Niembro y
  S. Marcos 

• Aproximaciones utilizadas
• Hartree y Hartree-FockCorrelaciones de pairing
  en BCS, incluyendo los mesones virtuales ?, ?, ?
  y ?.
• Temas investigados
• Simetría de Pseudo-Espín Eur. Phys. J. A
  43 (2010) 369
• Radio cuadrático medio de carga Phys. Atom.
  Nucl. 75 (2012) 269
• Efecto anómalo de los piones en la estructura de
  capas
• Phys. Atom. Nucl. ( aceptado)
• Efecto del potencial tensor en la estructura de
  capas
• Phys. Atom. Nucl. (aceptado)
• Colaboración externa
• L. N. Savushkin (Universidad de St.
  Petersburgo, Rusia).

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GRUPO FÍSICA NUCLEAR TEÓRICAUNIVERSIDAD DE
BARCELONA
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Nuclear Physics _at_ the University of Barcelona
Líneas de investigación y métodos
Estructura Nuclear y Sistemas Nucleares Exóticos
núcleos al límite de la estabilidad, extrañeza y
charm en el medio nuclear
(funcional de la densidad, funciones espectrales,
Wigner-Kirkwood, OBE models, EFT)
EOS y aplicaciones en Astrofísica Nuclear y
Colisiones de Iones Pesados
EOS de las estrellas de neutrones, materia
nuclear simétrica y asimétrica, RHIC,
LHC (funcionales de la densidad, Funciones de
Green autoconsistentes, BHF, DBHF, Modelo
Multimodular para RHIC)
Gases atómicos ultrafríos mezclas
bosón-fermión, dinámica de los condensados
spinoriales (teoría BCS, uniones
Josephson, ecuación de Gross-Pitaevskii)

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2011 highlights
Neutron Skin of 208Pb, Nuclear Symmetry Energy,
and the Parity Radius Experiment
Suppression of Superfluidity upon Overflow of
Trapped Fermions Quantal and Thomas-Fermi Studies
A new Thomas-Fermi approach to inhomogeneus
superfluid Fermi systems is discussed. The
generic fact that if a fermionic superfluid in
BCS regime overflows from a narrow container into
a much wider one, pairing is much suppress at the
overflow point. P. Schuck and X.
Viñas, Phys.Rev. Lett., 107, 205301 (2011)
Parity-violating electron scattering is studied
at conditions of the PREX experiment of JLab.
The consequences for the determination of the
neutron skin thickness of 208Pb and for the
density dependence of the nuclear symmetry
energy have been analyzed
X. Roca-Maza, M. Centelles, X. Viñas, M.
Warda Phys. Rev. Lett. 106, 252501 (2011)
Sponsors
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GRUPO FÍSICA ATÓMICA, MOLECULAR Y
NUCLEARUNIVERSIDAD ISLAS BALEARES
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Quantum Physics Group at Mallorca

• We investigate quantum transport at the
  nanoscale
• Numerical Renormalization Group calculations of
  strongly correlated quantum dots J.S. Lim, D.
  Sanchez, R. Lopez et al., Phys. Rev. B 81, 235309
  (2010) Phys. Rev. B 83, 155325 (2011)
• Nonequilibrium fluctuation-dissipation theorems
  R. Lopez, D. Sanchez et al., Phys. Rev. Lett.
  104, 076801 (2010)
• Majorana fermions in nanostructures J.S. Lim,
  R. Lopez and Ll. Serra, in preparation (2011).
• Quantum information A. Borras, M. Casas et al.,
  Phys. Rev. A 79, 022112 (2009)

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Awarded EPS PhD Thesis

• Xavier Roca-Maza
• Oscar Moreno

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1) Gamow-Teller strength distributions
Oscar Moreno PhD
Gamow-Teller (single beta) strength distributions
and b half-lives in the lead region (neutron
deficient Hg, Pb, Po isotopes, ISOLDE_at_CERN
experiments). Shape coexistence and signatures of
deformation in Gamow-Teller patterns, which are
robust against changes in details of the
nucleon-nucleon force. Gamow-Teller strength
distributions of stable and unstable Xe isotopes.
Signatures of deformation and relation with
charge-exchange reactions (EXL_at_FAIR test of
feasibility). Phys. Rev., C73,054302, 2006
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2) Two-neutrino double-beta decay
Oscar Moreno PhD
Two-neutrino double-beta decay matrix elements.
Several effects analyzed nuclear deformation,
strength of pairing and Gamow-Teller
correlations, active-shells occupations.
Dominance hypotheses in beta spectra and running
sums of matrix elements (NEMO experiment and
others). Closure approximation for two-neutrino
and neutrinoless double-beta decay. Effect of
pairing and nuclear deformation. Phys. Rev.,
C81,041303(R), 2010, J.Phys.G
Nuc.Part.Phys. 36, 015106, 2009
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3) Parity-violating electron scattering
Oscar Moreno PhD
Parity-violation asymmetry in polarized electron
elastic scattering by nuclei and its relation to
neutron distribution and neutron skins (208Pb,
PREX experiment Ca and Sn isotope
chains). Analysis of deviations from reference
value of the asymmetry to study nuclear isospin
mixing and nucleon strangeness content in NZ
nuclei. Nucl.Phys., A828, 306 (2009)
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1) Gamow-Teller strength distributions
Oscar Moreno PhD
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2) Two-neutrino double-beta decay
Oscar Moreno PhD
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3) Parity-violating electron scattering
Oscar Moreno PhD