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The high-resolution in-flight spectroscopy (HISPEC) project at FAIR

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Presentation on theme: "The high-resolution in-flight spectroscopy (HISPEC) project at FAIR"— Presentation transcript:

1 The high-resolution in-flight spectroscopy (HISPEC) project at FAIR
Zsolt Podolyák, University of Surrey GANIL, 4-6 October 2005

2 High-resolution in-flight spectroscopy (HISPEC collaboration)
49 institutions, 20 countries

3 FAIR (Facility for Antiproton and Ion Research) (Darmstadt, Germany)
fragmentation based radioactive beam facility 350m ~1GeV/u ~1012 ion/s fragmentation/fission fragment separator low-energy cave 0-100 MeV/u starts to operate ~2011

4 Low-energy branch: Mono-energetic energy buncher: (~500 MeV/u => 0-100 MeV/u)
Principle: Very fast (ns) cooling Layout: Conceptional design by 2006: C.Brandau, Univ. of Surrey

5 in-flight and decay spectroscopy beam energy buncher

6 - high resolution gamma-ray spectroscopy + +
Features isotopes of all elements; 3 MeV/u < E <100 MeV/u ions with short lifetimes (>100 ns) beam cocktail or mono isotopic beams isomeric beams - high resolution gamma-ray spectroscopy + + - high resolution particle spectroscopy + + - beams at Coulomb barrier energies - intermediate energy beams: MeV/u HISPEC

7 Physics goals and observables
Table 1: Experimental opportunities for high-resolution spectroscopy at the low-energy branch. Research field Experimental method (beam-energy range) Physics goals and observables Beam int. (particle/s) Nuclear structure, reactions and astrophysics Intermediate energy Coulomb excitation, In-beam spectroscopy of fragmentation products (E/A ~ 100 MeV) Multiple Coulomb excitation, direct and deep-inelastic, fusion evaporation reactions (E/A ~ 5 MeV; Coulomb barrier) Decay spectroscopy (E/A = 0 MeV) Medium spin structure, Evolution of shell structure and nuclear shapes, transition probabilities, moments, high spin structure, single particle structure, dynamical properties, transition probabilities, moments, half-lives, spins, nuclear moments, GT strength, isomer decay, beta-decay, beta-delayed neutron emission, exotic decays such as two proton, two neutron. HISPEC DESPEC

8 Beam intensities High primary beam intensity ~1012 ion/s for 238U
High transmission (SuperFRS)

9 Characteristics of the beam after the energy buncher
Energy and angular spread of the beam: 300 MeV/u: sE ~ 0.3 MeV/u sa ~ 5 mrad 5 MeV/u: sE ~ 3 MeV/u sa ~ 20 mrad Characteristics of the beam after the energy buncher Courtesy of H. Weick

10 CDR p.65. Some physics questions with radioactive beam

11 Physics Example: the Zr isotopes (Z=40)
90Zr Zr Zr Zr82 spherical deformed (β=0.45) spherical ? Coulomb excitation decay Lifetime: >1 s s <1 s T.R. Werner, J. Dobaczewski, W. Nazarewicz, Z. Phys. A358 (1997) 169

12 HISPEC – Low energy cave (3-100 MeV/u)
Particle tracking (Z,pos.,E) Identification (spectrometer) Charged particle det. γ-ray det.

13 RISING HISPEC …

14 Coulomb excitation at ~100 MeV/u
54Cr 56Cr counts 835keV counts 1006keV Eg Eg spectra are efficiency corrected Doppler corrected counts 880keV 58Cr B(E2) from double ratio (peak area/particles)/54Cr efficiency from 60Co source + Lorentz-boost Ng, Npro => s => B(E2)-Bestimmung möglich aber: relativ zu 54Cr ist es genauer B(E2) values: 54Cr ± 0.6 W.u. (normalisation) 56Cr ± 3.0 W.u. 58Cr ± 4.2 W.u. Eg A.Bürger et al., Phys. Lett. B (2005).

15 Secondary fragmentation at ~100 MeV/u
dE-E Si-CsI dE CATE E 2+ -> 0+ 4+ -> 2+ 6+ -> 4+ 8+ -> 6+ 50Cr 8+->6+ 6+ -> 4+ 4+ -> 2+ 2+ -> 0+ 46Ti M.Bentley et al.

16 HISPEC – Low energy cave (3-100 MeV/u)
Particle tracking (Z,pos.,E) Identification (spectrometer) Charged particle det. γ-ray det.

17 Beam tracking and identifying detectors
Most promising: Diamond CVD detectors (E/A= MeV) Carbon foil (electron emission) + multichannel plates (E/A=5 MeV)

18 Ideal for high velocity beams
Advanced GAmma Tracking Array High photo-peak efficiency Good angular resolution <1degree FWHM=10 keV at β=50% = 5 keV at β=20% Ideal for high velocity beams see G.Duchene’s talk

19 Electromagnetic transition strength measurements (lifetimes)
(plungers and fast scintillators) Plungers: Not stopper foil, but degrader foil has to work connected to gamma and charged particle detectors identification after reaction (to clean spectra from background) see C.Fransen’s talk

20 Particle identification after the target
dE-E detectors, good Z resolution, bad A resolution (β spread) TOF + dE-E huge detector size needed Bρ + TOF + dE-E reduced transmission initially existing ALADIN magnet Later: dedicated magnetic spectrometer for E/A=3-100 MeV Meeting: Paris, 3 Oct. 2005

21 Letter of intent: physics
HISPEC/DESPEC collaboration structure Management Board Spokesperson(HISPEC) Zsolt Podolyák / Wolfram Korten Spokesperson(DESPEC) Berta Rubio Deputy (HISPEC) Jan Jolie Deputy (DESPEC) Phil Woods Project manager (HISPEC) Juergen Gerl Project manager (DESPEC) Magda Gorska Technical Board member affiliation beam tracking and identification detectors J.M. Quesada University Sevilla, Spain AGATA J. Simpson CCLRC Daresbury,UK HYDE charged particle detectors for reaction studies I. Martel Huelva University, Spain Charged particle detectors for structure studies D. Rudolph Lund University, Sweden Plunger A. Dewald Koln University, Germany Magnetic spectrometer D. Ackermann GSI Darmstadt, Germany DSSD implantation and decay detector P.J. Woods Edinburgh University, UK DESPEC high resolution gamma detectors A. Jungclaus Universidad Autonoma de Madrid, Spain Neutron detectors D. Cano-Ott CIEMAT Madrid, Spain Total absorption spectrometer L. Batist PNPI Gatchina, Russia Fast timing with BaF2 H. Mach Uppsala University, Sweden Isomeric moments D. Balabanski Camerino University, Italy Electronics and Data acquisition J. Nyberg Collaboration Board The members are the signatories of the Memorandum of Understanding. 32 institutions, 15 countries Letter of intent: physics Technical Proposal evaluated by PAC

22 Summary HISPEC: high-resolution in-flight spectroscopy
low-energy cave (0-100 MeV/u) Intermediate energy secondary fragmentation Coulomb excitation RISING Coulomb barrier energy experience needed (beam tracking …)

23 HISPEC – SPIRAL2 (GANIL) common points
Physics AGATA + ancillary detectors Detector development + electronics + data acquisiton Tracking detectors Si detectors (HISPEC/DESPEC, R3B, EXL…) Electronics: ASIC Neutron detectors (DESPEC) …

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