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Spectroscopy of Light to Medium Mass Lambda Hypernuclei Jefferson Lab Experiment E01-011

Spectroscopy of Light to Medium Mass Lambda Hypernuclei Jefferson Lab Experiment E01-011. Joerg Reinhold Florida International University presented at PANIC05 October 24, 2005. Hypernuclear Spectroscopy. Hypernucleus: one or more nucleons replaced by a hyperon, L , S or X.

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Spectroscopy of Light to Medium Mass Lambda Hypernuclei Jefferson Lab Experiment E01-011

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  1. Spectroscopy of Light to Medium Mass Lambda Hypernuclei Jefferson Lab Experiment E01-011 Joerg Reinhold Florida International University presented at PANIC05 October 24, 2005

  2. Hypernuclear Spectroscopy Hypernucleus: one or more nucleons replaced by a hyperon, L , SorX • Characteristics • No Pauli blocking ==> probing deep inside the nucleus • Narrow intrinsic width (~100 keV) • L single particle energies in excitation range of more than 20 MeV • Spin dependent L-N interactions (s.s. & s.o.) much weaker than N-N case • What to learn • Hyperon nucleon interaction, i.e. at low momentum • Spin dependent interactions • L effective mass and potential depth in the nuclear medium • Identity of L as function of A H. Hotchi, et al., Phys. Rev. C64, 044302 (2001)

  3. Previous L Hypernuclear Spectroscopyestablished major shell structure 12C(p+,K+)L12C KEK DE = 2 MeV (FWHM) BNL DE = 3 MeV (FWHM) P.H. Pile, et al., Phys. Rev. Lett. 66, 2585 (1991) T. Hasegawa, et al., Phys. Rev. C53, 1210 (1996)

  4. Experimental Considerations High resolution spectrometers at low momentum

  5. E89-009 Results T. Miyoshi, et al., PRL90, 232502 (2003) Theoretical line is a superposition(not a fit) with strength from [19] and positions from[20].

  6. New Jlab E01-011 ExperimentSpectroscopic study of L hypernuclei up to the medium heavy mass region by the (e,e’K+) reaction • North Carolina A&T U. • Minnesota University • Louisiana Tech. U. • Yerevan Physics Institute • University of Zagreb • University of Bucharest • University of Sao Paulo Tohoku University Yamagata University KEK Osaka EC University Hampton University Florida International U. Houston University TJNAF

  7. Experimental Setup

  8. Tilt method for ENGE to reduce the accidental rate • Scattered electrons • (0.2 to 0.4 GeV/c) • (1) Bremsstrahlung • (2) Møller scattering • (3) Virtual photons Locate ENGE with 7.74 degree. to avoid (1) and (2) processes.

  9. Optimization of the tilt angle Accept region. Side view

  10. Tilted ENGE (e-) Spectrometer

  11. HKS + ENGE + Splitter HKS ENGE Splitter

  12. Expected Energy Resolution ~400 keV

  13. Trigger condition • HKS (Kaon trigger) --- 12 kHz - 1X & 1Y & 2X & AC & WC AC -pion rejection, WC -proton rejection ( 1X - 2X -1.1 MHz ) • ENGE --- 1.2 MHz Hodoscope 1layer & 2layer • Coincidence trigger ~500 Hz DAQ dead time ~5% *Rates are with carbon target (100 mg) , 26 mA 1X 1Y AC 2X WC K+ HKS arm

  14. Calibration: CH2(e,eK) HNSS 2000 HKS 2005 210 lambdas 1390 lambdas

  15. 12C(e,eK)12LBwith imperfect on-line reconstruction On-line Preliminary Do not quote! ~1000 counts in g.s. (full set ~ 2500 in g.s.

  16. 28Si(e,e’K)tracking algorithm and reconstruction matrix NOT optimized On-line Preliminary Do not quote!

  17. Summary • 12C 12LB (>1000 counts in g.s.) • Precision analysis of core excited states • p-orbit states splitting ? • comparison with the mirror hypernucleus, 12LC • 28Si  12LAl (expected up to 1000 counts in g.s.) • The first precision spectroscopy beyond the p-shell • ls splitting in the p, d orbits ? • Other targets (6Li, 9Be, 10B, 51V, 89Y) • Rate study for heavier targets, new experiment for 51V approved • p-shell spectroscopy • Target mass dependence --- quasifree K+ electroproduction

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