1. S.N.Nakamura, Tohoku Univ. JLab HallC Meeting 22/Jan/2010, JLab

2. AZAZ p A  (Z-1)

3. Hypernuclei in wide mass rangeHypernuclei in wide mass range Medium - Heavy hypernuclei Neutron/Hyperon star Light Hypernuclei (s,p shell) A 1205020010 57 Elementary Process Strangeness electro-production Fine structure Baryon-baryon interaction in SU(3)  coupling in large isospin hypernuclei Cluster structure Hyperonization  Softening of EOS ? Superfluidity Single-particle potential Distinguishability of a  hyperon U 0 (r), m  *(r), V  NN,... E89-009 12 C E01-011 7 Li 12 C 28 Si Neutron/Hyperon star, Strangeness matter E94-107 9 Be 12 C 16 O Shell model Bare  N Int. Few body calc. Mean Field Theory Cluster calc.

4. 12 C (e,e’K) 12  B Calibration and Reference spectrum Preliminary JLAB – HKS s  (2 - /1 - ) p       C.E. #1 (1 - ) C.E. #2(2 - /1 - ) Accidentals B  (MeV) Count s / 0.15 MeV gs resolution: 465 keV (FWHM) KEK E369 (2001) 12 C ( ,K) 12  C FWHM ~1.5 MeV JLab E94-107 (2004) Hall A 12  B Excitation Energy(MeV) Counts /0.2 MeV FWHM~ 670keV

5. 7 Li target : Physics of (A = 7,T=1) E. Hiyama et al. PRC80,054321(2009) -5.40 (EXP) -3.79 (EXP) Possible Charge Sym. Breaking? NO Reliable DATA -4.42 (T=1) -6.39 -5.40 B Λ =-5.58 7  Li 7  He 7  Be α Λ n n α Λ n p α Λ p p M.Jurič et al., NP B52(1973) 1

6. 7 Li(e,e’K + ) 7  He JJ -B  [MeV] Cross section [nb/sr] SLAC4KMAID 1/2 + -5.3713.216.29.7 Theoretical calculation Binding energy: Hiyama w/o CSB Cross section: Sotona et.al. (1.3 < E  < 1.6 GeV, 1 < q K < 13 deg.) Preliminary result ID-B  [MeV] Cross section [nb/sr] #1-5.7±0.2 (stat.) ±0.2 (sys.) 15±3 (stat.) ±3 (sys.) #1 Resolution : ~510 keV (FWHM) for g.s. Data taking : ~30 hours w/ 30  A

7. 7 Li target :Physics of (A = 7,T=1) E. Hiyama et al. PRC80,054321(2009) 7 Li(e,e’K + ) -5.40 (EXP) -3.79 (EXP) Possible Charge Sym. Breaking? -4.42 (T=1) -6.39 -5.40 -6.7  0.2  0.2 (E01-011 Preliminary)

8. 7  He α n n Λ α  Unbound neutron halo Bound states Direct Observation of  ’s glue-like role n n NO DATA Another Physics of HKS-HES (E05-115)

9. 28 Si(e,e’K + ) 28  Al – First Spectroscopy of 28  Al Preliminary SS pp dd Counts / 0.15 MeVB  - Binding Energy (MeV) JLAB – HKS Accidentals g.s. resolution ~420 keV KEK E140a (1995) 28  Si Gateway Gateway to hypernuclear spectroscopy in the medium-heavy mass region Enriched 28 Si target 100 mg/cm 2 30  A electron beam Natural Si target 2000 mg/cm 2 10 6 /sec  + beam 28  Al

10. 28 Si(e,e’K + ) 28  Al – First Spectroscopy of 28  Al Preliminary SS pp dd Counts / 0.15 MeVB  - Binding Energy (MeV) JLAB – HKS Accidentals g.s. resolution ~420 keV Gateway Gateway to hypernuclear spectroscopy in the medium-heavy mass region Enriched 28 Si target 0.1 g/cm 2 30  A electron beam 28  Al Motoba et al. Full shell model calc. [s 4 p 12 (sd) 12 ] space

11. E05-115 HKS-HES the 3 rd generation (e,e ’ K + ) hypernuclear spectroscopy Aug. ~ Oct. 2009  Medium - heavy hypernuclear spectroscopy 52 Cr(e,e’K + ) 52  V   hyperon bound in the mean field  quark picture vs. conventional picture  Light  hypernuclear spectroscopy   N interaction, ls coupling, Charge Symmetry Breaking  p shell hypernuclei 7 Li, 9 Be, 10 B, 12 C, 16 O targets  Calibration and study of the elementary process  proton : H 2 O and CH 2 Introduction of newly developed HES (High-resolution Electron Spectrometer)

12. PreChicane-SPL-(HKS+HES) Configuration

14. SPL : One entrance, Four exits!

16. Hypernuclei in wide mass rangeHypernuclei in wide mass range Neutron/Hyperon star, Strangeness matter Light Hypernuclei (s,p shell) A 1205020010 57 Elementary Process Strangeness electro-production Fine structure Baryon-baryon interaction in SU(3)  coupling in large isospin hypernuclei Cluster structure Hyperonization  Softening of EOS ? Superfluidity E05-115 1 H 7 Li 9 Be 10 B 12 C 52 Cr Single-particle potential Distinguishability of a  hyperon U 0 (r), m  *(r), V  NN,... Medium - Heavy hypernuclei 3 rd Gen. Exp. Bare  N Int. Few body calc. Mean Field Theory Cluster calc. Shell model

17. 10 B target Millener’s parameterization(V,D,S N,S ,T) Hyperball’s  data αα n Λ 10 Be Λ αα p Λ 10 B Λ Imperfect treatment of Tensor force? Bad wavefunction of the core nucleus? predicts >200keV 1 - 2 - separation 10 B(e,e’K) Cluster Calc. based on the same framework

18. Calibration Run M x -M  [MeV] Count [/MeV] Missing Mass spectrum HKS-HES coin time spectrum ns count True+Acc. Acc   HES mom [GeV/c ] HKS mom [GeV/c]   Width of  ~4MeV (FWHM) Good Coincidence!

19. 12 C Target Data (w/ untuned matrices) -B  [MeV] Count [/MeV] g.s? P-shell?

20. TargetNumber of Quasi-Free  (observed) Quasi-Free  Cross Section (assumed) Hypernuclei (g.s) Cross Section (assumed) Expected number of g.s 7 Li6.4 x10 4 1.0  b/sr 21 nb/sr1300 9 Be4.5 x10 4 1.2  b/sr 4 nb/sr150 10 B4.8 x10 4 1.3  b/sr 21 nb/sr780 12 C3.4 x10 4 1.5  b/sr 112 nb/sr2500 52 Cr1.4 x10 4 4.7  b/sr 69 nb/sr210 Cross section of QF  is assumed as 0.2*A 0.8 [b/sr] # of g.s is calculated as (# of )*(g.s cross section)/(QF  cross section) Cross Section of 9 Be is derived by Progress of Theoretical Physics Supplement No.117 (1994) pp. 151-175 (M. Sotona and S. Frullani) and other cross sections are summarized in E05-115 experiment proposal (JLab PAC 28 and 33).

21. Summary  With a high quality electron beam from CEBAF, (e,e’K) hypernuclear spectroscopy was established  The second gen. exp. E01-011 (HKS) achieved <500keV (FWHM) resolution 12  B : s  width problem solved 7  He : first reliable observation of g.s., CSB 28  Al : first observation, doorway to mid-heavy HY  The third gen. exp. E05-115 (HKS-HES) successfully finished  Calibration, Elementary Process 7  He : CSB,  glue-like role 9  Li : p-shell Hy 10  Be : CSB, Tensor force, Sheds light on 10  B problem 12  B : Reference data & core excited states 52  V : First mid-heavy HY data, core-config. mixing, ls-force Final Check of Analysis Preparing for publication Preparing mass production of 1 st condensed data set