Investigating Exotic Nuclei by Nuclear Reactions H. Lenske - - PowerPoint PPT Presentation

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Investigating Exotic Nuclei by Nuclear Reactions H. Lenske Institut fr Theoretische Physik, U. Giessen Classification of Nuclear Reactions > 1AGeV: Agenda: Nuclear Structure far off Stability: Continuum Dynamics New Modes of

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SLIDE 1

Investigating Exotic Nuclei by Nuclear Reactions

  • H. Lenske

Institut für Theoretische Physik, U. Giessen

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SLIDE 2

Classification of Nuclear Reactions > 1AGeV:

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SLIDE 3

Agenda:

  • Nuclear Structure far off Stability: Continuum

Dynamics

  • New Modes of Excitations
  • Antiprotons for Nuclear Structure Research
  • New Territory: Nucleon Resonances in Exotic Nuclei
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SLIDE 4
  • I. Continuum Spectroscopy
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SLIDE 5

The Softness of Exotic Nuclei

HFB & QRPA Calculations Polarizability Coefficients from Sum Rules: Pl = S-1(l)/S0(l) Sn(l) = Sc |Mc(l)|2 En

c

…reduced Separation Energies: Sn~8 MeV  ~100 keV

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SLIDE 6

Mean-Field and Correlation Dynamics: 19C

The s.p. shell model picture: Prevalence of a static potential The DCP picture: Binding by Core Polarization Potential

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SLIDE 7

Core Polarization: 1/2+ QRPA Strength Functions in 14C Hole strength function Particle strength function

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SLIDE 8

Correlation Dynamics in an Open Quantum System: Fano-Resonances in 15C

G~60…140keV

Sonja Orrigo, H.L., Phys.Lett. B633 (2006) ; exp. proposal at TRIUMF

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SLIDE 9

Fano-Dynamics at the Dripline: Bound States embedded into the Continuum (BSEC) in

17,19C

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SLIDE 10

7Be(3/2-,0.0 ) p3/2: 62% 7Be(3/2-,0.0 ) p1/2: 11% 7Be(3/2-,0.0 ) f 7/2: 10% 7Be(3/2-,0.0 ) f 5/2: 4% 7Be(1/2-,0.420) p3/2: 13%

  • Relativistic eikonal theory
  • NN T-Matrix
  • 3-body kinematics
  • dynamical correlations

G(the.): 75 MeV/c G(exp.): 91 ± 5 MeV/c s(-1p,the.): 104 mb s(-1p,exp.): 98 ± 6 mb

A text book example: 8B(2+) 7Be+p removal reaction

Eikonal Reaction Theory and microscopic folding Uopt

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SLIDE 11

Low-energy Structure Physics by high- energy RIB: 1n-Removal @900 AMeV

  • C. Nociforo et
  • al. PRC 85

(2012) Theory: HFB/QRPA/SM and Eikonal- Description

33...36 32...35

Al n Al  

34 33

Al n Al  

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SLIDE 12
  • II. (g,g‘)-Scattering and New Modes of

Excitation at the Particle Threshold

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SLIDE 13

Electric Dipole Response of Exotic Nuclei

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SLIDE 14

The Giessen Approach:

Density Functional Theory and Multi-Phonon QRPA Theory

 

 

 

 

q q q q q qq' q q' q p,n q,q' p,n

E( , ) E( , ) T U f ...

 

                

 

 

q qq' q' q' q'' q'q'' q' q'q'' q q

1 1 U V V ( ) V 2 2            

 

   

2 qq' qq' q'' q'q'' k' k'' k'k'' q'' k'k'' q q q'

1 f V ( ) 2 V V 2              

 

1 2 1 1 2 2 1 2 3 1 1 2 2 3 3 1 2 1 2 3

† † † † † † n nJ n n n J n J n n n n J n J n J J J n n n n n n

E J z z z

  

 

                      

  

Excited States:

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SLIDE 15

Sn Isotopes: DFT-HFB Results

(N. Tsoneva, HL, PRC77 (2008))

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SLIDE 16

3-Phonon PDR Results (QPM)

  • N. Tsoneva, H. Lenske, PRC 77:024321 (2008)

Data: P. von Neumann-Cosel et al.

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SLIDE 17

Low Energy Dipole Response: Parity Assignment

PRL 104, 072501 (2010)

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SLIDE 18
  • III. Other Manifestations of the Nuclear

Skin

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SLIDE 19

Evolution of Single Neutron Continuum Strength

Level Density in the Continuum  Speed plot

1 ( )

j j

d S E dE   

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SLIDE 20

The „PQR“: Low-Energy Quadrupole Response- B(E2) Transition Strength

  • N. Tsoneva, H. Lenske, Phys. Lett. B695, 174180 (2011).
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SLIDE 21

QRPA 1- and 2+ Multipole-Response

128Sn

Microscopic DD-QRPA

1 2

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SLIDE 22

QRPA Spectral Distribution normalized to EWSR B(E2) 32Mg/34Mg: B(E2) 33Al/35Al:

2 2 2

( ) ( ) ( ) R S R     

  

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SLIDE 23
  • 1+ Data: HIgS facility@Duke
  • Theory: DFT-QRPA plus multi-phonon

configurations

  • 1-phonon states with J≤6
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…true “Alleinstellungsmerkmal“ (uniqueness) of NUSTAR@FAIR: …access to antiprotons/antimatter!

  • S. Lourenco,
  • S. Wycech

H.L.

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  • IV. Antiproton Physics on Exotic Nuclei:

The AIC-Proposal

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SLIDE 26

…dedicated to Paul Kienle

* 11. August 1931; † 29. Januar 2013

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SLIDE 27

Measuring Neutron Skins on Isotopic Chains (Ni,Sn…): p + A Absorption@FAIR: the AIC Proposal

  • P. Kienle, NMB 214 (2004)

and AIC@FAIR Proposal (2005) H.L., P. Kienle, Phys.Lett. B647 (2007) 82-87

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SLIDE 28

Measuring Neutron Skins on Isotopic Chains (Ni,Sn…): p + A Absorption on protons and neutrons

H.L., P. Kienle, Phys.Lett. B647 (2007) 82-87

 

 

2 2 2 2 2 abs pp p pn p p p n

g h(E ,Z) r g h(E ,N) r E ,N,Z r s    

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SLIDE 29

In-situ Annihilation: In-flight Annihilation:

Meson Production by Antinucleon Annihilation on Nuclei

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SLIDE 30
  • V. Heavy Ion Fragmentation Reactions
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SLIDE 31

Scenario of a fragmentation reaction Transport theory (GiBUU) and Statistical Multi- Fragmentation Model (SMM)

  • Phys. Lett. B 675, 297 (2009)
  • Phys. Lett. B 663, 197 (2008)

NPA 881:240 (2012)

(Tlab>2AGeV)

NPA (2013) in print

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SLIDE 32

L Production X-section (GiBUU) Fragment Production X-section (SMM)

Formation of a Hypernucleus by capturing a L to a pre-formed Fragment F:

Coalescence

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SLIDE 33

Production of Light Nuclei by GiBUU+SMM (FOPI data)

  • Th. Gaitanos, HL et al., Phys. Lett. B 675:297 (2009), NPA 881:240 (2012)
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SLIDE 34

Production of Hypernuclei in 12C+12C@2AGeV ( HypHI-Experiment) p

  • Th. Gaitanos, HL et al., NPA 881:240 (2012), NPA 2013 (in print)
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SLIDE 35

Production of Hypernuclei in HI-Collisions: where do the hyperons come from?

  • primary (resonance) production: N+NN+N*N+Y+K
  • secondary (mesonic) production: +NN*Y+K

Th. Gaitanos, HL,et al., Phys.

  • Lett. B

675, 297 (2009))

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SLIDE 36

Results for 89Y,K89YL: Gießen resonance model and microscopic nuclear structure

(KEK data: Hotchi et al.)

  • S. Bender, R. Shyam, HL, Nucl.Phys.A839:51,2010
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SLIDE 37
  • V. Nucleon Resonances in Exotic Nuclei
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SLIDE 38

Reaction at large 4-momentum transfer: Quasi-free (e,e‘p)/(p,pp‘) Scattering Longitudinal (RPA) Response Functions

  • A. Fedoseew, H.L., in progress
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SLIDE 39

Resonance Excitation at the FRS:

(H. Geissel)

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SLIDE 40

Resonance excitation in Sn-isotopes: RPA results for Ta=t- charge exchange: (N,Z)(N-1,Z+1) transitions - ASn ASb

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SLIDE 41

Neutrino-Nucleus Cross Sections and Response Functions

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  • V. Summary
  • Nuclear Dynamics around the Particle Threshold
  • Dynamics of the Nuclear Skin
  • Antiprotons for Exotic Nuclei
  • Hypernuclei from HI-fragmentation
  • Resonances in Exotic Nuclear Matter

…with contributions by Urnaa Badarch, Andreas Fedoseew, Theo Gaitanos, Stefanie Lourenco, Anika Obermann, Sonja Orrigo, Vladimir Ponomarev (TUD), Nadia Tsoneva, Slawomir Wycech (Warschau)

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"The best way to predict the future is to create it."

Peter Drucker (*1909-+2005) Austrian-American economist and „management-guru“