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  • Catalina Catalina CurceanuCurceanu ((PetrascuPetrascu))LNF LNF INFN, INFN, FrascatiFrascati

    On behalf of SIDDHARTA Collaboration

    IX International Conference onHypernuclear and Strange Particle Physics

    10-14 October 2006, Johannes Gutenberg-Universitt Mainz

  • ContentsContents

    1. Introduction2. Kaonic atoms: the SIDDHARTA scientific program3. Present situation (DEAR results)4. From DEAR to SIDDHARTA5. SDD tests, SIDDHARTA setup and Monte Carlo

    simulations6. Conclusions and further perspectives

  • SIDDHARTA Collaboration:SIDDHARTA Collaboration:

    LNF- INFN, Frascati, Italy

    IMEP- AW, Vienna, Austria

    IFIN HH, Bucharest, Romania

    Politecnico, Milano, Italy

    MPE, Garching, Germany

    PNSensors, Munich, Germany

    RIKEN, Japan

    Victoria Univ., Canada

    SISIliconlicon DDrift rift DDetector for etector for HHadronicadronic AAtom tom RResearch by esearch by TTiming iming AApplicationspplications

  • The scientific aim

    the determination of the isospin dependent KN scattering lengths through a

    ~ ~ eVeV measurement of the shiftmeasurement of the shiftand of the width

    of the K line of kaonic hydrogen

    and

    the first (similar) measurementfirst (similar) measurement of kaonic deuterium

  • Kaonic cascade and the strong interaction

    s p d f

    K 6.3 keV= E2p1s

    E1s}

    E2p

    n

    43

    2

    1

    K

  • AntikaonAntikaon--nucleon scattering lengthsnucleon scattering lengths

    Once the shift and widthshift and width of the 1s level for kaonic hydrogen anddeuterium are measured, with the Deser formulae (neglectingisospin breaking corrections):

    + i /2 = 412 aK-p eV fm-1

    + i /2 = 602 aK-d eV fm-1one can obtain the isospin dependent antikaon-nucleon

    scattering lengths

    aK-p = (a0 + a1)/2aK-n = a1

  • SIDDHARTA Scientific programSIDDHARTA Scientific programMeasuring the KN scattering lengths with the precision of a few percent will drastically change the present status of low-energy KN phenomenology and also provide a clear assessment of the SU(3) chiraleffective Lagrangian approach to low energy hadron interactions.

    1. Breakthrough in the low-energy KN phenomenology;

    2. Threshold amplitude in QCD

    3. Determination of the KN sigma terms, which give the degree of chiral symmetry breaking;

    4. Determination of the strangeness content of the nucleonfrom the KN sigma terms

    5. Information on (1405)

  • APD Cryo Cooler

    Varian Turbo Molecular Pump

    CryoTiger, CCD Cooling

    CCD Electronics

    Vacuum Chamber

    Hydrogen Target Cell

    CCD Pre-Amplifier Boards

    Cooling Lines

    CCD55-Chip (total of 16 chips)

    DEAR DEAR (DA(DANE NE Exotic Atom Exotic Atom

    Research) Research) 2002 2002 Cryogenic setupCryogenic setup

    Kaons from DANE

  • DADANE at LNF NE at LNF

  • DADANENE

  • DEAR on DADEAR on DANE (2002)NE (2002)

  • October December 2002 DAQset of good quality data

    Collected data:

    -Kaonic Nitrogen:6 28 October (about 17 pb-1 10 pb-1 in stable conditions);

    -Kaonic Hydrogen:30 October 16 December: about 60 pb-1

    -Background data (no collisions) for KH:16 23 December

  • Resulting K-p Spectrum(all background fit-components subtracted)

  • DEAR Results on the Shift and Width

    Shift: 1s = - 193 37 (stat.) 6 (syst.) eV

    Width: 1s = 249 111 (stat.) 30 (syst.) eV

    (published in Phys.Rev.Lett. 94, 212302 (2005))

    2 independent analyses starting from the raw datagiving consistant results

  • DEAR Results on kaonic hydrogenw

    idth

    1s

    [eV

    ]

    KpX

    -500 50000

    200

    400

    600

    800

    1000

    shift 1s [eV]

    Dav

    ies e

    t al,

    1979

    Izyc

    kiet

    al,

    1980

    Bird

    et a

    l, 19

    83

    Repulsive-type attractiveKpX (KEK)M. Iwasaki et al, 1997

    =

    -323

    63

    11

    eV

    =

    407

    20

    8

    100

    eV

    DEAR

  • Many interesting discussion in the dedicatedWorkshop:

    Exotic hadronic atoms, deeply bound nuclear states and antihydrogen: present results and future

    held at ECT* (Trento), on June 19-24, 2006

    Organizers: Catalina Curceanu (Petrascu) LNF INFN, Frascati (Italy) coordinator

    Eberhard Widmann , Stefan Meyer Institut fr subatomarePhysik - Austrian Academy of Sciences, Vienna (Austria)

    Akaki Rusetsky, Univ. Bonn, Germany

  • W. Weise at Exotic hadronic atoms, deeply boundkaonic nuclear states and antihydrogen:

    present results, future challenges, ECT* Trento, 19-24 June 2006

    B. Borasoy, R. Nissler andB. Borasoy, R. Nissler and

    J. A. Oller, J. Prades and M. VerbJ. A. Oller, J. Prades and M. Verb

    W. Weise, Phys. Rev. Lett. 94 (2005) 213401; W. Weise, Phys. Rev. Lett. 96 (2006) 199201.

    eni, Phys. Rev. Lett. 95 (2005) 172502;eni, Phys. Rev. Lett. 96 (2006) 199202.

    J. Mares, E. Friedman and A. Gal, Nucl. Phys. A770 (2006);J. Mares, E. Friedman and A. Gal, Phys. Lett. B606 (2005) 295.

  • W. Weise at Exotic hadronic atoms, deeply boundkaonic nuclear states and antihydrogen:

    present results, future challenges, ECT* Trento, 19-24 June 2006

  • KH present statusKH present status

    The obtained DEAR result:represents indeed the best measurement performed on Kaonic Hydrogen up to now

    BUT

    what we are aiming for is =>

  • SIDDHARTAs aim

    # few eV precision measurement of kaonickaonichydrogenhydrogen 1s level shift;

    # first measurement of kaonic deuteriumkaonic deuterium

    in order to determine the in order to determine the isospinisospin dependent dependent antikaonantikaon

    nucleon scattering lengths at percent level nucleon scattering lengths at percent level precisionprecision

  • Use instead of the CCD detectors of DEARnew X-ray triggerable device

    Choice of the detector based on criteria:

    -preserve good features of CCDs (efficiency, resolution);

    -offer a timing ~ 1 s trigger

    Large Area Silicon Drift Detector

    (JRA10 HadronPhysics, FP6)

  • 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1100

    200

    300

    400

    500

    600

    700

    800

    A (cm-2)

    FWH

    M (e

    V)

    SDD PIN Si(Li) 150 K 5.9 keV line

    PIN Tsh=20us

    Si(Li) Tsh=20us

    SDD Tsh=1us

    Spectroscopic resolution and timing : detector comparison

  • The Silicon Drift Detector with on-chip JFET

    JFET integrated on the detector capacitive matching: Cgate = Cdetector minimization of the parasitic capacitances reduction of the microphonic noise simple solution for the connection detector-electronics in monolithic arraysof several units

  • Background reduction with triggered acquisitionby Monte Carlo

    starting from DEAR results (S/B = 1/70):

    S/B = 4/1

  • SDD layout readout side

    sensitive area

    3 x 100 mm

    chip size: 34 x 14 mm

    integrated temperature sensors

  • The final SDD moduleThe final SDD module

  • SDDSDD--subunitsubunit

    2 array of 3 cm2 SDD

    18 cm2 SDD unit

  • SDDSDD--subunit subunit

  • PIXE of Al and Al2O3

  • Spectroscopy test SIDDHARTA SDDs T = -60 C, = 1 sec

    w4

    0/

    s01

    w4

    5/

    s03

    w4

    9/

    s01

  • SIDDHARTA setup

    Beam Pipe

    side view

    K+

    K-

    e+ e-

    Kaon Trigger Set up

    top view

  • The SIDDHARTA Setup The SIDDHARTA Setup

  • The SIDDHARTA Setup The SIDDHARTA Setup

  • The Cryogenic Target Cell The Cryogenic Target Cell

    APD 2-stage cryo coolerwith 8 watt @ 20K

    Cryogenic target cell75 m Kapton within a pure aluminum gridPmax. ~ 5 bar

  • The Cryogenic Target Cell The Cryogenic Target Cell

  • Target Cell and SDDTarget Cell and SDD--subunitsubunit

  • The VLSI readout electronics

  • (New) SDD Charge Preamplifier configuration

    CgdRd

    detector chip

    Cdtransimpedance amplifier

    Out

    VssVdet

    Vs

    Vg

    Iref

    gatecurrentleakage

    current

    -A

    A1R1C1

    Cf

    Low frequencyloop

    Low frequencyloop

    *

    * World first applicationIntegrated feedback

    capacitor

  • Spectroscopic Measurements

  • The Kaon trigger

  • Study for PMs supporting

  • SIDDHARTA Trigger Scheme

    PM1PM6

    PM1PM6

    SPLIT C.F.

    in1

    in6

    in1

    in6

    Electronicin1

    inn

    in1

    inm

    tdc1

    tdc6

    tdc1

    tdc6

    STOP

    adc1

    adc6

    adc1

    adc6

    Fast Discr.

    GateRF/4

    COMMON START

    GATE

    The tdcs and adcs information of PMs and the output of SIDDHARDA SDDsmust be recorded simultaneously for any trigger in order to allow selection of true kaon or background (mip) events.

    Triggerto SIDDHARTA

    Upper

    Lower

    MT

    MT

    OR

    OR

    In1In2In3

    In1In2In3

    Coincidence

    PM: Hamamatsu R4998Scint: BC420Dim.: 160 x 35 x 1.5 mm

    Typical NIM signal whosewidth can be adjusted from7 ns up to what needed

    -V

    TDC

    ADC

    scaler

    Inhibit from DAQ ?

  • The setup on DAFNE

  • The SIDDHARTA setup in DAThe SIDDHARTA setup in DANENE

    Beam pipe and trigger system

    side view

    K+

    K-

    e+ e-