Hypernuclear Spectroscopy

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Hypernuclear Spectroscopy

• Joerg Reinhold
• Florida International University
• for the
• Jefferson Lab Collaborations E97-104, E01-011,
  E05-115

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Aspects of Hypernuclear Physics

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

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L Hypernuclear Spectroscopy
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L Hypernuclear Chart
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g spectroscopy (KEK)
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JLab Hall A (E94-107)
KEK
Jlab DE650 keV Core excited states 12C strength
well reproduced 16O strength off by factor of 2
Theoretical interpretation and publication in
progress.
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Jlab Hall C (HKS)
KEK
Also 7Li, 12C targets (51V 89Y for rate studies)
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Heavy L-Hypernucleiin the
reaction
KEK E140a T. Hasegawa, et al., PRC53(1996)1210.
DE0.5 MeV FWHM 2.2 MeV
Single particle motion over the full spectral
range -gt describe with mean field dynamics
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Sensitivity to coupling constants
DE1.65 MeV FWHM
T. Hasegawa, et al., PRC53(1996)
2.2 MeV FWHM
Hotchi, et al., PRC64(2001)
DDRH H.Lenske et al. Link free to in-medium
coupling constants Free LN, hypernuclear, nuclear
matter in the same framework
Substantial SU(3) symmetry breaking
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BHF approach for hypernuclear matter
(Hans-Joseph Schulze INFN Catania)
Absolute energy scale in (e,eK) DE 100 keV
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Past Successes

• Reaction spectroscopy
• (p,K) reaction spectroscopy established(BNLKEK)
  L single particle levels up to A208 hits
  ceiling at DE1.7 MeV.
• (e,eK) established in 2000 DElt1MeV (HNSS)
• (e,eK) refined E94-107 (Hall A) E01-011
  (HKS) DE650keV

• g spectroscopy
• hyperball at BNL KEK
• Data on
• LS in 13C
• The incredible shrinking nucleus BE(2) in 7LLi

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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 A50 (V, Cr)
• Substantial from Japan (Tohoku University) HKS
  spectrometer for 2005, HES in 2007
• JLab proposal angular distributions
• Substantial from Italy (septa, RICH)

• JPARC g-spectrosc.( )
• Light nuclei
• LS-splitting
• High precision
• Day-1 experiments E05 E13 at JPARC hadron
  facility
• US collaborators FIU, HU, (no contributions
  yet several lt 100k items identified.)

All major equipment on hand or funded.
Support needed for small components, equipment
maintenance, and running manpower.
Other world wide efforts FAIR GSI, FINUDA_at_DAFNE,
MAMIC_at_Mainz
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JLab JPARC Hypernuclear Community