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(F.Cusanno, M.Iodice et al,Phys. Rev. Lett.103 202501 (2009). 670 keV FWHM M. Iodice,F.Cusanno et al. Phys.Rev.Lett. 99,052501 (2007) 12 C ( e,e’K ) 12 B 16 O(e,e’K) 16 N WATERFALL The WATERFALL target: reactions on 16 O and 1 H nuclei High Resolution Hypernuclear Spectroscopy at Jefferson Lab Hall A
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Radiative corrected experimental excitation energy vs theoretical data (thin curve). Thick curve: three gaussian fits of the radiative corrected data Experimental excitation energy vs Monte Carlo Data (red curve) and vs Monte Carlo data with radiative Effects “turned off” (blue curve) Radiative corrections do not depend on the hypothesis on the peak structure producing the experimental data 9 Be(e,e’K) 9 Li (g. M Urciuoli, F. Cusanno, S. Marrone et al) to be submitted to Phys. Rev.
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hadron arm septum magnets RICH Detector electron arm aerogel first generation aerogel second generation To be added to do the experiment Hall A deector setup
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HRS – HKS: (e, e’K + ) experiments for mass spectroscopy HKS – Enge or HKS – HES: New decay - spectroscopy experiment Unified collaboration from the previous Hall A and C collaborations Enge ( ) HES ( ) HKS (K) HRS (e’) Septum Combine the features of previous Hall A and C experiments, create an optimized future program w/ the CEBAF CW beam Future Project: Super Hypernuclear Physics at Jlab Future Project: Super Hypernuclear Physics at JlabA Study with High Precision on the Electro-production of the and -Hypernuclei in the Full Mass Range
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1. Elementary 2. Few-body N interaction 2 D (e,e’K + ) [ N ] Exotic bound state, N interaction N, Charge Symmetry Breaking( CSB) 4 He ( e,e’K + ) 4 H N, Charge Symmetry Breaking( CSB) e,e’ reaction spectroscopy 4. Heavy in heaviest nucleus 208 Pb(e,e’K + ) 208 Tl in heaviest nucleus 3.Medium-heavy 40,44,48 Ca ( e,e’K + ) 40,44,48 K 27 Al ( e,e’K + ) 27 Mg 48 Ti(e,e’K + ) 48 Sc - Reliable data from 1 H(e,e’K + ) S 0 at low Q 2 - Dynamis, f.f.,… - N, A dependence of B - Mean field approximation - Single particle nature of - The role of three body forces - Neuron stars structure and dynamics 5
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Decay Pion Spectroscopy to Study -Hypernuclei Direct Production p e’ e 12 C K +K + Example: Low lying Hypernuclear States 12 B g.s. E.M. 12 C - Weak mesonic two body decay (~10 - 10 s) ** Fragmentation Process p e 12 C ** s 12 B * e’ K +K + Highly Excited Hypernuclear States 4H4H Fragmentation (<10 - 16 s) 4 H g.s. 4 He -
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High resolution, high yield, and systematic study is essential using electromagnetic probe and BNL 3 MeV Improving energy resolution KEK336 2 MeV ~ 1.5 MeV - Energy resolution - Spin flip 635 KeV 670 KeV hadron probe vs e.m. probe 7
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H.Hotchi et al. PRC 64 (2001)044302 51 V P.H.Pile et al. PRL 66 (1991) 2585 A = 40A ~ 50 40 Ca = (Z=20, N=20) : 40 K = one proton hole +
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Be windows H 2 O “foil” WATERFALL The WATERFALL target: reactions on 16 O and 1 H nuclei
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1 H (e,e’K) 16 O(e,e’K) 16 N 1 H (e,e’K) L S Energy Calibration Run Results on the WATERFALL target - 16 O and 1 H Water thickness from elastic cross section on H Precise determination of the particle momenta and beam energy using the and peak reconstruction (energy scale calibration)
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