The HypHI project at GSI Hypernuclear spectroscopy with heavy ion beams

The HypHI project at GSIThe HypHI project at GSI

Hypernuclear spectroscopy Hypernuclear spectroscopy with heavy ion beamswith heavy ion beams

Take R. Saito, for the HypHI collaborationTake R. Saito, for the HypHI collaboration

GSI-DarmstadtGSI-DarmstadtHelmholtz Center for Heavy Ion Reserach Helmholtz Center for Heavy Ion Reserach

and and Johannes Gutenberg-Universität MainzJohannes Gutenberg-Universität Mainz

The HypHI project, T.R. Saito, HYP2006 MainzThe HypHI project, T.R. Saito, HYP2006 Mainz

How much can we extend this How much can we extend this landscape?landscape?

Around the Around the -stability line-stability line((++,K,K++), (K), (K--,,--), (e,e’K), (e,e’K++))BNL, KEK, J-PARC, CEBAF, FINUDA, MAMI CBNL, KEK, J-PARC, CEBAF, FINUDA, MAMI C

Neutron rich hypernucleiNeutron rich hypernuclei(K(K--,,))J-PARC, FINUDAJ-PARC, FINUDA

Toward hypernuclei at necleon drip-lines: Hypernuclei at Toward hypernuclei at necleon drip-lines: Hypernuclei at extreme isospinsextreme isospins

Heavy ion collisionHeavy ion collisionJINR, HypHI JINR, HypHI

-hypernuclear chart


Heavy Ion Beams: Heavy Ion Beams: Powerful Tools for Hypernuclear Powerful Tools for Hypernuclear

SpectroscopySpectroscopyRelativistic hypernuclei: projectile fragment → hypernuclei


How much can we extend this How much can we extend this landscape?landscape?

Around the Around the -stability line-stability line((++,K,K++), (K), (K--,,--), (e,e’K), (e,e’K++))BNL, KEK, J-PARC, CEBAF, FINUDA, MAMI CBNL, KEK, J-PARC, CEBAF, FINUDA, MAMI C

Neutron rich hypernucleiNeutron rich hypernuclei(K(K--,,))J-PARC, FINUDAJ-PARC, FINUDA

Toward hypernuclei at necleon drip-lines: Hypernuclei at Toward hypernuclei at necleon drip-lines: Hypernuclei at extreme isospinsextreme isospins

Heavy ion collisionHeavy ion collisionJINR, HypHI JINR, HypHI

-hypernuclear chart


Hypernuclear magnetic momentsHypernuclear magnetic moments

With meson and electron beam induced hypernuclear With meson and electron beam induced hypernuclear productionproduction

Very small recoil momentum of produced hypernucleiVery small recoil momentum of produced hypernuclei

Almost impossible to perform direct measurements of Almost impossible to perform direct measurements of hypernuclear magnetic momentshypernuclear magnetic moments

B(M1) measurements with B(M1) measurements with -ray spectroscopy-ray spectroscopy

Hyperball-J at J-PARCHyperball-J at J-PARC

Contributions from nuclear collective motion have to be Contributions from nuclear collective motion have to be subtractedsubtracted

With heavy ion collisionsWith heavy ion collisionsHypernuclei at projectile rapidity Hypernuclei at projectile rapidity →→ relativistic hypernuclei relativistic hypernuclei

Hypernuclei can be separated by a magnetic spectrometerHypernuclei can be separated by a magnetic spectrometer

Precession of hypernuclear spin alignment in magnetic fieldPrecession of hypernuclear spin alignment in magnetic field

Perturbed Perturbed -- asymmetry asymmetry →→ magnetic moments magnetic moments

Can be performed only at FAIR in near futureCan be performed only at FAIR in near future


The HypHI projectThe HypHI projectHypernuclear spectroscopy Hypernuclear spectroscopy with heavy ion beams at with heavy ion beams at GSI/FAIRGSI/FAIR

LOI: submitted to the GSI PAC LOI: submitted to the GSI PAC in March 2005in March 2005

Approved by Helmholtz Approved by Helmholtz Association as Helmholtz-Association as Helmholtz-University Young University Young Investigators group at GSI Investigators group at GSI with Mainz Universitywith Mainz University

A proposal of the Phase 0 A proposal of the Phase 0 experimentexperiment

Submitted to the GSI PACSubmitted to the GSI PACTo be discussed on October To be discussed on October 2323rdrd

Giessen University, GermanyGiessen University, GermanyGSI (DVEE, KP2, KP3), GermanyGSI (DVEE, KP2, KP3), GermanyJINR, Dubna, RussiaJINR, Dubna, RussiaJohannes Gutenberg University Johannes Gutenberg University Mainz, GermanyMainz, GermanyKEK, JapanKEK, JapanMoscow State University, RussiaMoscow State University, RussiaNara Women’s University, JapanNara Women’s University, JapanNiels Bohr Institute, DenmarkNiels Bohr Institute, DenmarkOsaka Electro-Communication Osaka Electro-Communication University, Japan University, Japan Osaka University, JapanOsaka University, JapanPeking University, ChinaPeking University, ChinaRIKEN, JapanRIKEN, JapanSoltan Institute for Nuclear Soltan Institute for Nuclear Studies, PolandStudies, PolandTokyo University, JapanTokyo University, JapanTokyo University of Science, JapanTokyo University of Science, JapanTohoku University, JapanTohoku University, JapanTRIUMF, CanadaTRIUMF, Canada

Still expanding …… Still expanding ……

Spokesperson : Take R. Saito, GSISpokesperson : Take R. Saito, GSI


Hypernuclei with Heavy Ion Hypernuclei with Heavy Ion Beams: Beams:

The HypHI projectThe HypHI projectHeavy ion induced reaction at Heavy ion induced reaction at relativistic energies (heavy-ion relativistic energies (heavy-ion collision)collision)

NN -> NN -> KN : Energy threshold ~ 1.6 KN : Energy threshold ~ 1.6 GeVGeVHeavy ion beams with E > 1.6 GeV/u Heavy ion beams with E > 1.6 GeV/u neededneededStable heavy ion beam at GSIStable heavy ion beam at GSIStable heavy ion beam at FAIRStable heavy ion beam at FAIRRI-beam from FRS and super-FRSRI-beam from FRS and super-FRS

Large Lorentz factor Large Lorentz factor Effective lifetime : Longer by the Effective lifetime : Longer by the Lorentz factorLorentz factor

200 ps -> 600 ps with 200 ps -> 600 ps with =3=3200 ps -> 4 ns with 200 ps -> 4 ns with =20 =20

Only a few light hypernuclei so Only a few light hypernuclei so far identified with heavy ion far identified with heavy ion beams at Dubna (beams at Dubna (33

H and H and 44H, ~ H, ~

0.2 0.2 b, with b, with 44He and He and 77Li beams)Li beams)


Heavy Ion Beams: Heavy Ion Beams: Powerful Tools for Hypernuclear Powerful Tools for Hypernuclear

SpectroscopySpectroscopyFRS Super-FRSE > 1.7 A GeV

I > 105/s


Hypernuclei with Heavy Ion Hypernuclei with Heavy Ion Beams: Beams:

The HypHI projectThe HypHI projectHeavy ion induced reaction at Heavy ion induced reaction at relativistic energies (heavy-ion relativistic energies (heavy-ion collision)collision)

NN -> NN -> KN : Energy threshold ~ 1.6 KN : Energy threshold ~ 1.6 GeVGeVHeavy ion beams with E > 1.6 GeV/u Heavy ion beams with E > 1.6 GeV/u neededneededStable heavy ion beam at GSIStable heavy ion beam at GSIStable heavy ion beam at FAIRStable heavy ion beam at FAIRRI-beam from FRS and super-FRSRI-beam from FRS and super-FRS

Large Lorentz factor Large Lorentz factor Effective lifetime : Longer by the Effective lifetime : Longer by the Lorentz factorLorentz factor

200 ps -> 600 ps with 200 ps -> 600 ps with =3=3200 ps -> 4 ns with 200 ps -> 4 ns with =20 =20

Only a few light hypernuclei so Only a few light hypernuclei so far identified with heavy ion far identified with heavy ion beams at Dubna (beams at Dubna (33

H and H and 44H, ~ H, ~

0.2 0.2 b, with b, with 44He and He and 77Li beams)Li beams)


HypHI at GSI/FAIR: Concept of ExperimentsHypHI at GSI/FAIR: Concept of Experiments

Produced hypernucleus at the similar velocity of Produced hypernucleus at the similar velocity of projectilesprojectiles

Large Lorents factor Large Lorents factor > 3 > 3

200ps -> 600ps (200ps -> 600ps (=3), hypernuclear decay in flight=3), hypernuclear decay in flight

Example : Example : 1212C + C + 1212C -> C -> AAZ + KZ + K+,0+,0 + X + X

Scintillators + diamondTrackersN-detectorK+ counter

Magnet

n

Residues

p,

K

-Hypernucleustarget

Mesonic weak decay• -> - + p

Non-mesonic weak-decay• p -> np


Goals of the HypHI projectGoals of the HypHI projectHypernuclear magnetic momentsHypernuclear magnetic moments

Quark bulding blockesQuark bulding blockes

Quark Pauli blocking effectQuark Pauli blocking effect

// coupling as functions of isospins coupling as functions of isospins

Kaon currents in the nuclear matterKaon currents in the nuclear matter

Hypernuclei at extreme isospinsHypernuclei at extreme isospinsCold neutron matterCold neutron matter

// coupling coupling


Accelerator facility at GSIAccelerator facility at GSI


Accelerator facility at GSIAccelerator facility at GSI

FRS


Phase 0 of HypHIPhase 0 of HypHIThe goal of the Phase 0 experimentsThe goal of the Phase 0 experiments

To confirm Dubna’s hypernuclear production at 2 A GeV To confirm Dubna’s hypernuclear production at 2 A GeV with with 66Li primary beams : Mesonic decay Li primary beams : Mesonic decay -> -> -- + p + p

33H H ->-> -- ++ 33HeHe

44H H ->-> -- ++ 44HeHe

55He He ->-> -- ++ 44HeHe ++ pp


ALADiN magnetALADiN magnet


TOF detectorsTOF detectors

TOF-start (new development)TOF-start (new development)Polycrystalline diamond detectorPolycrystalline diamond detector

High rate: 10High rate: 1088 /s /s

Excellent time resolution: < 15 psExcellent time resolution: < 15 ps

ALADiN TOF wall (existing)ALADiN TOF wall (existing)Plastic scintillator barsPlastic scintillator bars

For negative charged particles (mainly For negative charged particles (mainly --))

Horizontal(x)-vertical(y) trackingHorizontal(x)-vertical(y) tracking

TOF+ (new development)TOF+ (new development)Plastic scintillator barsPlastic scintillator bars

For positive charged particlesFor positive charged particles

xy trackingxy tracking

GSIGSI


Scintillating fiber arraysScintillating fiber arrays

TR0TR0x and y planesx and y planes

Energy and time readoutEnergy and time readout

TR1 and TR2TR1 and TR2x, y and d planesx, y and d planes

Time readoutTime readout

Used for tracking triggersUsed for tracking triggers

Osaka Electro-communication Osaka Electro-communication University, Osaka Univ., Mainz Univ., University, Osaka Univ., Mainz Univ., GSIGSI


Trigger designTrigger designTracking trigger (KTracking trigger (K++ and K and K00 channel)channel)

Two types of verticesTwo types of vertices

One vertex in the targetOne vertex in the targetMeson productionMeson production

FragmentationFragmentation

Vertex out of the targetVertex out of the targetHypernuclear decayHypernuclear decay

Free-Free- decay decay

FPGA/DSP based trigger moduleFPGA/DSP based trigger module

Efficiency to Efficiency to 44H events : ~ 14 %H events : ~ 14 %

GSI, Mainz Univ.GSI, Mainz Univ.

target

TR1

TR2

→ HypHI poster, S. Minami et al


-- trigger (hypernuclear decay) trigger (hypernuclear decay)-- from the target from the target

Low momentumLow momentum

Hitting to the side yoke of the ALADiN magnetHitting to the side yoke of the ALADiN magnet

-- from hypernuclei and free- from hypernuclei and free- at projectile rapidity at projectile rapidity regionregion

Lorentz boosted at Lorentz boosted at ~3~3

Larger momentumLarger momentum

Observed by the ALADiN TOFObserved by the ALADiN TOF

EfficiencyEfficiency28 % for 28 % for 44

H eventsH events→ HypHI poster, S. Minami et al


Z=2 trigger by TOF+Z=2 trigger by TOF+Z=2 particles from the hypernuclear decayZ=2 particles from the hypernuclear decay

33H -> H -> 33HeHe + + --

44H -> H -> 44HeHe + + --

55He -> He -> 44HeHe + p + + p + --

By TOF+By TOF+

EfficiencyEfficiency95 % for 95 % for 44

H eventsH events→ HypHI poster, S. Minami et al


EstimatesEstimates

Beam: Beam: 66Li, 10Li, 107 7 /s, 2 A GeV/s, 2 A GeVTarget: Target: 1212C, 8 g/cmC, 8 g/cm22

Trigger efficiency with tracking + Trigger efficiency with tracking + - - + Z=2: 7 %+ Z=2: 7 %Trigger rate: ~ 340 HzTrigger rate: ~ 340 Hz

Additional detectors consideredAdditional detectors consideredKK++ detector: Osaka Univ. detector: Osaka Univ. Drift chambers: GSI, KEKDrift chambers: GSI, KEK

Proposal: submitted to the GSI PACProposal: submitted to the GSI PACExperiment: beginning of 2008Experiment: beginning of 2008

What to be measured: What to be measured: Cross sectionCross sectionLifetimeLifetimePolarizationPolarizationForward correlation between Forward correlation between and other charged particles and other charged particles

4H

→ HypHI poster, S. Minami et al


HypHI Project at GSI/FAIRHypHI Project at GSI/FAIR

HypHI project startedHypHI project startedLOI and progress report to the LOI and progress report to the GSI PAC, Design studyGSI PAC, Design study

Design study, preparation for Design study, preparation for the phase 0 experimentthe phase 0 experiment

Phase 0: experiment with Phase 0: experiment with 33H, H,

44H and H and 55

HeHe

Design study for the setup for Design study for the setup for hypenuclear non-mesonic hypenuclear non-mesonic weak decay measurementsweak decay measurementsPhase 1: Experiments for Phase 1: Experiments for proton-rich hypernucleiproton-rich hypernuclei

Phase 2: Experiment for Phase 2: Experiment for neutron- rich hypernuclei at neutron- rich hypernuclei at R3B/NuSTAR/FAIRR3B/NuSTAR/FAIR

Phase 3: Hypernuclear Phase 3: Hypernuclear separator separator

Hypernuclear magnetic Hypernuclear magnetic momentsmomentsHypernuclear drip-linesHypernuclear drip-lines

2004

2005

2006

2007

2008

2009

~2011

2010






44H and H and 55

HeHe



Phase 3: Hypernuclear Phase 3: Hypernuclear separatorseparator


2004

2005

2006

2007

2008

2009

~2011

2010

Phase 0

> 103 /week > 104 /week






44H and H and 55

HeHe





2004

2005

2006

2007

2008

2009

~2011

2010

Phase 0

Phase 1

> 103 /week > 104 /week






44H and H and 55

HeHe





2004

2005

2006

2007

2008

2009

~2011

2010

Phase 0

Phase 1

> 103 /week > 104 /week

Phase 2






44H and H and 55

HeHe





2004

2005

2006

2007

2008

2009

~2011

2010

Phase 0

Phase 1

> 103 /week > 104 /week

Phase 3


International Hypernuclear NetworkInternational Hypernuclear NetworkPANDA at FAIR• 2012~• Anti-proton beam• Double -hypernuclei• -ray spectroscopy

MAMI C• 2007~• Electro-production• Single -hypernuclei• -wavefunctionJLab

• 2006~• Electro-production• Single -hypernuclei• -wavefunction

FINUDA at DANE• e+e- collider• Stopped-K- reaction• Single -hypernuclei• -ray spectroscopy (2012~)

J-PARC• 2009~• Intense K- beam• Single and double -hypernuclei• -ray spectroscopy for single

HypHI at GSI/FAIR• Heavy ion beams• Single -hypernuclei at extreme isospins• Magnetic moments

SPHERE at JINR• Heavy ion beams• Single -hypernuclei



Backup slidesBackup slides


Trigger designTrigger design

Tracking trigger (KTracking trigger (K++ and K and K00 channel) channel)Two types of verticesTwo types of vertices

One vertex in the targetOne vertex in the targetMeson productionMeson production

FragmentationFragmentation

Vertex out of the targetVertex out of the targetHypernuclear decayHypernuclear decay

Free-Free- decay decay

FPGA/DSP based trigger moduleFPGA/DSP based trigger module

Efficiency to Efficiency to 44H events : ~ 14 %H events : ~ 14 %

target

TR1

TR2


Tracking triggerTracking triggerMade with scinitillating fiber trackersMade with scinitillating fiber trackers

Secondary vertex behind the targetSecondary vertex behind the target

Hypernuclear/Hypernuclear/ decay decay

PMTDiscriminator cardwith GSI chip-3

VME Logic module with FPGA and DSP

LVDS



500 MHzT to VME bus

Tracking trigger

HAMAMATSU32 pixels From Mainz/KaoS collaboration

New development at GSI


Phase 0 of HypHIPhase 0 of HypHIThe goal of the Phase 0 experimentsThe goal of the Phase 0 experiments

To confirm Dubna’s hypernuclear production at 2 A GeV To confirm Dubna’s hypernuclear production at 2 A GeV with with 66Li primary beams : Mesonic decay Li primary beams : Mesonic decay -> -> -- + p + p

33H H ->-> -- ++ 33HeHe

44H H ->-> -- ++ 44HeHe

55He He ->-> -- ++ 44HeHe ++ pp


Improved setup for phase 0Improved setup for phase 0

Positive charged particlesp, d, t, 3He, 4He, 6Li

Negative charged particles -


Expanding fieldExpanding fieldFINUDA at Frascati J-PARC

PANDA at FAIR/GSI Kaos at MAMI C CEBAF

-> De Mori->Noumi, Tamura, Fukuda, Nakazawa, Hiyama,

->Motoba, Garialdi, Tedeschi, Tang, Tang, Hahimoto, Song


Expanding fieldExpanding fieldFINUDA at Frascati J-PARC

PANDA at FAIR/GSI Kaos at MAMI C CEBAF

Difficulties on these experiments

• Direct measurements on hypernuclear magnetic moments• Quark bulding blocks (Qurak Pauli effect and so on)• / coupling• Kaon currents in nuclei

•Hypernuclei away from the -stability line (at extreme isospins), especiaaly for heavy hypernuclei

• Isospin dependence on the hyperon wavefunction• N interactions• Very neutron rich hypernuclei (cold neutron matter)• Very proton rich hypernuclei

Heavy ion induced hypernuclear spectroscopy


Why hypernucleiWhy hypernuclei

nn

(udd)(udd)pp

(uud(uud))

(ud(uds)s)

(uds(uds

))

nn N.R.N.R. N.R.N.R. S.H.S.H. S.H.S.H.

pp N.R.N.R. S.H.S.H. S.H.S.H.

D.HD.H..

D.H.D.H.

D.H.D.H.N.N. : Nuclear reactionS.H. : Single-s HypernucleiD.H. : Double-s Hypernuclei

Baryon-baryon interaction

~ 10-10 s

Baryons in the core Baryons in the core of neutron starsof neutron stars


Hypernuclear landscapeHypernuclear landscape

Essential to study baryon-baryon interaction under SU(3)Essential to study baryon-baryon interaction under SU(3)ff

40/64 vertices can be studied with hypernuclei40/64 vertices can be studied with hypernuclei


S=-1 sectorS=-1 sectorOnly 37 Only 37 -hypernuclei identified-hypernuclei identified


New VME logic moduleNew VME logic module

Purely VME basedPurely VME based

256 channels I/O256 channels I/OLVDSLVDS

Fast logic calculations with a Fast logic calculations with a large FPGA at 500 MHzlarge FPGA at 500 MHz

Slow complicated calculations by Slow complicated calculations by DSPDSP

Data transfer to the VME busData transfer to the VME bus

Modules will also be used by the Modules will also be used by the MAMI C KaoS experimentsMAMI C KaoS experiments


FAIR: a future facility of GSIFAIR: a future facility of GSI

Current facility

NUSTAR

China is an associated member of FAIR!!


Hypernuclear separator (Phase 3)Hypernuclear separator (Phase 3)Hypernuclear production at 20 A GeV at the FAIR Hypernuclear production at 20 A GeV at the FAIR facilityfacility

Hypernuclei separated by a superconducting magnetHypernuclei separated by a superconducting magnet

1m

superconducting magnet

scintillator barrel

target

collimator

sweeping magnet

detector for x,y,E

TR1TR2

TP-MUSIC

Sci1

Sci2

to beam dump

ALADiN

• Hypernuclear magnetic moments• Hypernuclei toward the nucleon drip-lines




1m


scintillator barrel

target

collimator

sweeping magnet

detector for x,y,E

TR1TR2

TP-MUSIC

Sci1

Sci2

to beam dump

ALADiN

Hypernuclear production at 20 A GeV. Carbon or diamond target, 12g/cm2.




1m


scintillator barrel

target

collimator

sweeping magnet

detector for x,y,E

TR1TR2

TP-MUSIC

Sci1

Sci2

to beam dump

ALADiN

4m long superconducting magnet. Separation of hypernuclei with the collimator.


Hypernuclear separator (Phase 3)Hypernuclear separator (Phase 3)Separation by the 4m 5T magnetSeparation by the 4m 5T magnet

66Li + Li + 1212C at 20 A GeVC at 20 A GeV

10 20 30 40 [cm]

6Li, 4He, 4He

4H 3

H, 3H

5He

3He, 3He




1m


scintillator barrel

target

collimator

sweeping magnet

detector for x,y,E

TR1TR2

TP-MUSIC

Sci1

Sci2

to beam dump

ALADiN

Removing light hadrons from the hypernuclear decay before the sweeping magnet.




1m


scintillator barrel

target

collimator

sweeping magnet

detector for x,y,E

TR1TR2

TP-MUSIC

Sci1

Sci2

to beam dump

ALADiN

Hypernuclear events reconstruction tagged by mesonic and non-mesonic weak decay




1m


scintillator barrel

target

collimator

sweeping magnet

detector for x,y,E

TR1TR2

TP-MUSIC

Sci1

Sci2

to beam dump

ALADiN

Precession of the spin distribution of hypernuclei. Precession angle :

• 225 degrees with free- magnetic moment• 205 degrees with 8.8% reduction due to the kaon exchanging current




1m


scintillator barrel

target

collimator

sweeping magnet

detector for x,y,E

TR1TR2

TP-MUSIC

Sci1

Sci2

to beam dump

ALADiN

Precession of the spin distribution of hypernuclei. Precession angle :

• 225 degrees with free- magnetic moment• 205 degrees with 8.8% reduction due to the kaon exchanging current

Asymmetric pionic hypernuclear decayAlmost 4 sr solid angle


Rate estimate Rate estimate with the hypernuclear separator (Phase with the hypernuclear separator (Phase

3)3)Beam intensity : 10Beam intensity : 101010/s at 20 A GeV/s at 20 A GeV

Target : Target : 1212C, 12 g/cmC, 12 g/cm22

Reconstruction efficiency in the decay region : 10 %Reconstruction efficiency in the decay region : 10 %

Documents

The HypHI project at GSI Hypernuclear spectroscopy with heavy ion beams