Post on 31-Dec-2015
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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)
12C(e,e’K)12BL
16O(e,e’K)16NL
The WATERFALL target: reactions on 16O and 1H nuclei
High Resolution Hypernuclear Spectroscopy at Jefferson Lab Hall A
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
9Be(e,e’K)9Li L (g. M Urciuoli, F. Cusanno, S. Marrone et al) to be submitted to Phys. Rev.
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
HRS – HKS: (e, e’K+) experiments for mass spectroscopyHKS – 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
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 JlabA Study with High Precision on the Electro-production of the and -Hypernuclei
in the Full Mass Range
5
1.Elementary , L S0
2.Few-body 2D(e,e’K+) [LN] - Exotic bound state, LN interaction 4He(e,e’K+)4LH - LN, Charge Symmetry Breaking( CSB)
e,e’ reaction spectroscopy
4. Heavy208Pb(e,e’K+) 208
LTl L in heaviest nucleus
3.Medium-heavy
40,44,48Ca(e,e’K+) 40,44,48LK
27Al(e,e’K+) 27LMg
48Ti(e,e’K+) 48LSc
- LN, L’s S.E., iso-spin, A dependence of BL
- Mean field approximation- Single particle nature of L- Tri-axial deformation-,Level inversion due to L
- Reliable data from 1H(e,e’K+) ,L S0 at low Q2
- Dynamis, f.f.,…
- LN, A dependence of BL - Mean field approximation- Single particle nature of L- The role of three body forces- Neuron stars structure and dynamics
Decay Pion Spectroscopy to Study -Hypernuclei
Direct Production
p
e’
e12C K
+
Example:
Low lying Hypernuclear States
12Bg.s.
E.M.
12C
-
Weak mesonic two body decay (~10-10s)
*
Fragmentation Process
pe
12C
*
s12B*
e’ K +
Highly Excited Hypernuclear States
4H
Fragmentation (<10-16s)
4Hg.s.
4He
-
7
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 KeV670 KeV
hadron probe vs e.m. probe
H.Hotchi et al. PRC 64 (2001)044302
51LV
P.H.Pile et al. PRL 66 (1991) 2585
A = 40 A ~ 50
40Ca = (Z=20, N=20) : 40
LK = one proton hole + L
Be windows H2O “foil”
H2O “foil”
The WATERFALL target: reactions on 16O and 1H nuclei
1H (e,e’K)L
16O(e,e’K)16NL
1H (e,e’K) ,L S
L
SEnergy Calibration Run
Results on the WATERFALL target - 16O and 1H
Water thickness from elastic cross section on H Precise determination of the particle momenta and beam energy using the L and S peak reconstruction (energy scale calibration)