R.Krücken

NUSTAR plans at FAIR

Reiner Krückenfor the NUSTAR collaboration

Physik Department E12Technische Universität München

&Maier-Leibnitz-Laboratoriumfür Kern- und Teilchenphysik

R.Krücken

Long Standing Questions of Nuclear Structure Physics

• What are the limits for existence of nuclei?– Where are the proton and neutron drip lines

situated? – Where does Mendeleyev’s table end?

• How does the nuclear force depend on varying proton-to-neutron ratios?– What is the isospin dependence of the spin-orbit

force?– How does shell structure change far away from

stability?

• How to explain collective phenomena from individual motion?– What are the relevant degrees of freedom and

symmetries of the many-body system?

• How are complex nuclei built from their basic constituents?– What is the effective nucleon-nucleon interaction?– How does it connect to QCD?

• What are the nuclei relevant for astrophysical processes and what are their properties?

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Superheavy elementsNuclear Structure at the extremes

Halos

New shell gaps through residual interaction

Neutron skins

Soft collective modes

Shell quenching bydiffuse surface

New shell gaps through residual interaction

132SnP. Ring, TUM

ele

ctri

c dip

ole

str

eng

th

harmonic oscillator+ spin-orbit+centrifugal

diffuse surfaceneutron rich+ spin-orbit

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Lack of predictive power of mean-field models

from RIA Whitepaper

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FAIR: Facility for Antiproton and Ion Research

Primary Beams

• 1012/s; 1.5-2 GeV/u; 238U28+

• Factor 100-1000 over present in intensity• 2(4)x1013/s 30 GeV protons• 1010/s 238U73+ up to 35 GeV/u • up to 90 GeV protons

Secondary Beams

•Broad range of radioactive beams up to 1.5 - 2 GeV/u; up to factor 10 000 in

intensity over present •Antiprotons 3 - 30 GeV

Storage and Cooler Rings

UNILACSIS

FRS

ESR

SIS 100/300

HESRSuperFRS

NESR

CR

RESR FLAIR •Radioactive beams

•e- - A and Antiproton-A collider

•1011 stored and cooled 0.8 - 14.5 GeV antiprotons

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UNILACSIS

FRS

ESR

HESRSuperFRS

NESR

CR

RESR

NUSTAR facility(NUclear-STructure, -Astrophysics, and -

Reactions)

NUSTAR collaboration(ca. 450 scientists) chair / deputy:

W.B. Gelletly / R. Krücken

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SUPERconducting FRagment Separator

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Super-FRS – Low Energy Branch

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Low Energy Branch

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The AGATA project(Advanced GAmma-ray Tracking Array)

4-array based on 180 36-fold segmented Ge detectors

AGATA will give major improvements compared to current Ge detector arrays in detection efficiency, angular resolution and rate capabilities

Technology• highly segmented Ge detectors • fast digital electronics • pulse shape analysis and tracking

• determination of each interaction point, full

tracking

• position resolution < 5mm

• angular resolution < 1º

• FWHM (1 MeV, =0.5) < 5keV > 40keV

• efficiency (M=1,30) 50% / 27% 20% / 5%

• data rate (M=1,30) 3 / 0.3 MHz <1/0.05

MHz

Features:

today

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Decay spectroscopy (DESPEC)

• Decay properties of nuclei along the r-process

– -decay half-lives, -delayed neutron emission

• Test of the stability of shell closures and search for shell-quenching

• Decay-spectroscopy of isomeric states

• Measurement of nuclear moments and lifetimes using gamma-ray spectroscopy following -decay or isomeric decays

Spokesperson: B. Rubio

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High Energy Branch

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High Energy BranchReactions with Relativistic Radioactive Beams

(R3B)

• total absorption cross section

• knock-out reactions

• quasi-free scattering

• electromagnetic excitations

• charge-exchange reactions

• fission and spalation

• projectile fragmentation

Magnet partly financed through EU constructionproposal

Spokesperson: T. Aumann

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Ring Branch

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Mass measurements in the storage ring (ILIMA)

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Schottky Frequency Spectrum

Yu.A. Litvinov et al.

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Reach of ILIMA mass measurements

Spokesperson: Y. Novikov

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Exotic nuclei studied in light-ion reactions at the NESR storage ring (EXL)

Reactions at low momentum transfer:

• Elastic Proton-Scattering • Quasi-free scattering• Transfer Reactions• Charge-exchange reactions• etc.

Spokesperson: M. Chartier

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Electron-Ion scattering in a Storage Ring (eA collider) (ELISe)

• charge densities from elastic electron scattering• collective modes via inelastic electron scattering • single-particle structure from (e,e’N) reactions

5 %

0.15 fm

132Sn(e,e)

Simulation for 1 week

Spokesperson: H. Simon

point-like probe + clean interaction precision studies in exotic nuclei

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Antiproton Ion Collider (AIC )Spokesperson: R. Krücken Project Manager: P. Kienle

P. Kienle, Nucl. Instr. Meth. B 214 (2004) 193

A A-1

p132Sn 131In132Sn 131Sn

z

-0.0

075

0.0

128

132Sn

Acceptancelimit of NESR

• annihilation of single nucleon in quasi-free process

• detection of A-1 products via Schottky Method or particle detectors

• measure• total absorption cross-section • absorption on neutrons and protons separately

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Radii and cross sections

AIC goal:rnp on the order of <10%

Determine proton and neutron radii independently in the same experiment

H. Lenske, P. Kienle, nucl-th/0502065

theoryfrom Cwith

2

2

2

ppR

nnR

pntotalR

rA

ZC

rA

NC

rC

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Summary and Outlook

• The FAIR facility is the central future project for the European Nuclear and Hadron Physics Communities

• The NUSTAR Facility with the Super-FRS covers a wide range of topics concerning the investigation of exotic nuclei in the areas of: Nuclear Structure, Nuclear Astrophysics, Nuclear Reactions

• NUSTAR will address fundamental questions concerning:

– the Structure und Dynamics of the many-body system atomic nucleus

– the Nature of the effective nucleon-nucleon interaction• relevant components, isospin dependence, correlations

– Nuclear Astrophysics and the Origin of the Elements

• The Super-FRS is part of the first stage of FAIR construction

• There will be a continuous transition from the current FRS program to the future activities at FAIR

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11 NUSTAR Technical Proposals

NUclear-STructure, -Astrophysics, and -Reactions Collaboration(includes ongoing GSI program at FRS, ESR, SHIP, and a strong theory community)

1.) Low Energy Branch (LEB) coord.: C.Scheidenberger GSI

High-resolution In-Flight Spectroscopy (HISPEC) Zs. Podolyak Surrey

Decay Spectroscopy with Implanted Ion Beams (DESPEC) B. Rubio Valencia

Precision Measurements of very short-lived Nuclei using an

Advanced Trapping System for highly-charged Ions (MATS) K.Blaum Uni. Mainz

LASER Spectroscopy for the Study of Nuclear Properties (LASPEC) P. Campbell Manchester

Neutron Capture Measurements (NCAP) M.Heil FZ Karlsruhe

Antiprotonic Radioactive Nuclides (Exo+pbar) M. Wada RIKEN

2.) High Energy Branch (R3B)

A Universal Setup for Kinematical Complete Measurements of

Reactions with Relativistic Radioactive Beams (R3B) T. Aumann GSI

3.) Ring Branch (STORIB)

Study of Isomeric Beams, Lifetimes and Masses (ILIMA) Y. Novikov St. Petersburg

Exotic Nuclei Studied in Light-Ion Induced Reactions

at the NESR Storage Ring (EXL) M. Chartier Liverpool

Electron-Ion Scattering in a Storage Ring (e-A Collider) (ELISe) H. Simon GSI

Antiproton-Ion Collider: A Tool for the Measurement of Neutron and

Proton rms radii of Stable and Radioactive Nuclei (AIC) R. Krücken TU Munich

>450 people