1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

Hypernuclear Spectroscopy

Joerg ReinholdFlorida International University

for theJefferson Lab Collaborations E97-

104, E01-011, E05-115

1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

Aspects of Hypernuclear Physics

• Free from Pauli blocking• Deeply bound states• ~100keV intrinsic width• mixing (CSB, 3BF)• Baryon structure in the nuclear medium• Central and spin dependent N intercations• Unified view of baryon-baryon interactions in SU(3)• Astrophysical aspects: hyperon matter, strange neutron

stars, …

1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

Hypernuclear Spectroscopy

1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

Hypernuclear Chart

1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

spectroscopy (KEK)

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7Li

1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

JLab Hall A (E94-107)

KEK

Jlab:E~650 keVCore excited states12C strength well reproduced16O strength off by factor of 2

Theoretical interpretation and publication in progress.

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12B

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16N

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12C

1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

Jlab Hall C (HKS)

Also 7Li, 12C targets (51V & 89Y for rate studies)

KEK

1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

Heavy -Hypernucleiin the reaction

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89Y

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139La

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208Pb

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AZ(π + ,K + )ΛAZ

KEK E140a: T. Hasegawa, et al., PRC53(1996)1210.E~0.5 MeV; FWHM ~ 2.2 MeV

Single particle motion over the full spectral range-> describe with mean field dynamics

1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

Sensitivity to coupling constantsT. Hasegawa, et al., PRC53(1996)

Hotchi, et al., PRC64(2001)

2.2 MeV FWHM

E=1.65 MeV FWHM

Substantial SU(3) symmetry breaking

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Rω = gΛω

gNω= 0.553

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Rω = gΛω

gNω= 0.25

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RωQC = gΛω

gNω= 2

3

DDRH: H.Lenske et al.Link free to in-medium coupling constantsFree N, hypernuclear, nuclear matter in the same framework

1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

BHF approach for hypernuclear matter (Hans-Joseph Schulze

INFN Catania)

Absolute energy scale in(e,e’K): E ~ 100 keV

1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

Past Successes

Reaction spectroscopy• ,K) reaction spectroscopy

established(BNL&KEK); single particle levels up to A=208; hits ceiling at E~1.7 MeV.

• (e,e’K) established in 2000; E<1MeV (HNSS)

• (e,e’K) refined; E94-107 (Hall A) & E01-011 (HKS); E~650keV

spectroscopy• hyperball at BNL & KEK• Data on• LS in 13C• The incredible shrinking nucleus:

BE(2) in 7Li

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7Li, Λ

9Be, Λ10B, Λ

11B, Λ15N, Λ

16O

1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

Future ProgramComplementary efforts at JLab & JPARC

Jlab: reaction spectr.• Light mirror nuclei (CSB)• Medium to heavy nuclei• Thin targets (isotopic enriched)• Neutron-rich

• E05-115 approved: A~50 (V, Cr)• Substantial $ from Japan (Tohoku

University): HKS spectrometer for 2005, HES in 2007

• JLab proposal: angular distributions

• Substantial $ from Italy (septa, RICH)

JPARC: -spectrosc.( )

• Light nuclei• LS-splitting• High precision

• Day-1 experiments E05 & E13 at JPARC hadron facility

• US collaborators: FIU, HU, … (no contributions yet; several < $100k items identified.)

Other world wide efforts: FAIR GSI, FINUDA@DANE, MAMIC@Mainz

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16O(e,e'K + )Λ16N

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AZ(e,e'K + )ΛA (Z −1)

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AZ(K −,π −)ΛAZ

All major $$$ equipment on hand or funded. Support needed for small components, equipment maintenance, and running & manpower.

1/12/2007 DNP Town Meeting, Joerg Reinhold (FIU)

JLab & JPARC Hypernuclear Community