Spectroscopic Investigation of hypernuclei in the wide mass region using the (e,e’K + ) reaction (Extension request of the currently running E01-011 exp eriment) Osamu Hashimoto Department of Physics, Tohoku University representing the HKS collaboration JLab PAC28 August 24, 2005 P05-115
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Spectroscopic Investigation of hypernuclei in the wide mass region using the (e,e’K + ) reaction (Extension request of the currently running E01-011.
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Spectroscopic Investigation of hypernuclei in the wide mass region
using the (e,e’K+) reaction(Extension request of the currently running E01-011 experiment)
Osamu Hashimoto Department of Physics, Tohoku University
representing the HKS collaboration
JLab PAC28 August 24, 2005
P05-115
Hyper Collaboration• O. Hashimoto (Spokesperson), S.N. Nakamura (Spokesperson), Y. Fujii, M. Kaneta, M. S
umihama, H. Tamura,K. Maeda, H. Kanda, Y. Okayasu, K. Tsukada, A. Matsumura, K.~Nonaka, D. Kawama, N. Maruyama, Y. Miyagi (Tohoku U)
• S. Kato (Yamagata U)• T. Takahashi, Y. Sato, H. Noumi (KEK)• T. Motoba (Osaka EC)• L. Tang (Spokesperson), O.K. Baker, M. Christy, L. Cole, P. Gueye, C. Keppel, L. Yuan (H
ampton U)• J. Reinhold (Spokesperson), P. Markowitz, B. Beckford, S. Gullon, C. Vega (FlU)• Ed.V. Hungerford, K. Lan, N. Elhayari, N. Klantrains, Y. Li,S. Radeniya (Houston)• R. Carlini, R. Ent, H. Fenker, D. Mack, G. Smith, W. Vulcan, S.A. Wood, C. Yan (JLab)• N. Simicevic, S. Wells (Louisiana Tech)• L. Gan (North Carolina, Wilmington)• A. Ahmidouch, S. Danagoulian, A. Gasparian (North Carolina A&T)• D. Dehnhard (Minnesota)• M. Elaasar(New Orleans)• R. Asaturyan, H. Mkrtchyan, A. Margaryan, S. Stepanyan, V. Tadevosyan (Yerevan)• D. Androic, T. Petkovic, M. Planinic, M. Furic (Zagreb)• T. Angelescu (Bucharest)• V.P. Likhachev (Sao Paulo)• M. Ahmed (Duke)
Outline of the talk
1. Significance of hypernuclear spectroscopy and
goals of the proposed experiment
2. (e,e’K+) spectroscopy and the current status
of E01-011 experiment
3. Setup & conditions of the proposed experiment
4. Summary with prospect
Significance of hypernuclear spectroscopy
andthe goals of the proposed experiment
3D Nuclear Chart with the strangeness degree of freedom
Single-particle nature of hypernuclei
• New degree of freedom free from Pauli blocking• Deeply bound nuclear states• Baryon structure in nuclear medium
• Unique structure of hadronic many-body system• Nucleus with a new quantum number• Core excited states• Glue role of a hyperon
• N interaction• Unified view of baryon-baryon interaction in SU(3)• Central and spin-dependentN interaction
Singly charged atomCore Nucleus +
Core excitation,
A hyperon in the mean field
Nucleon single particle orbits
e e’
p
Single-particle nature of hypernuclei
• New degree of freedom free from Pauli blocking• Deeply bound nuclear states• Baryon structure in nuclear medium
• Unique structure of hadronic many-body system• Nucleus with a new quantum number• Core excited states• Glue role of a hyperon
• N interaction• Unified view of baryon-baryon interaction in SU(3)• Central and spin-dependentN interaction
Singly charged atomCore Nucleus +
Core excitation,
A hyperon in the mean field
YN, YY Interactions and Hypernuclear Structure
Free YN, YY interactionConstructed from limited hyperon scattering data
(Meson exchange model: Nijmegen, Julich)
YN, YY effective interaction in finite nuclei(YN G potential)
HKS as a “strangeness tagger”HES as a “virtual photon tagger”
Complimentary to spectroscopy with hadronic beams at J-PARC
Requested beam timeTarget Hypernucleus # of days # of hours
Spectrometer commissioning &
calibration4(8) 96(192)
Data taking
6,7Li,10,11B
6,7He, 10,11
Be 5 120
51V 51Ti 14 336
89Y 89Sr 5 120
Subtotal for data taking 24 576
Grand total 28(32) 672(768)
Summary
• Precision hypernuclear spectroscopy by the (e,e’K+) reaction plays an essential role in the investigation of hadronic may-body systems that contain “strangeness”.
• Physics goal of the proposed experiment is two-fold; spectroscopy of heavier hypernuclei (51V target) and light hypernuclei(6,7Li or10,1
1B targets).
• A high resolution electron spectrometer (HES) is under construction at TOHOKU as a part of the HKS-HES hypernuclear spectrometer system. It will be shipped to JLab at the end of 2006.
• The HKS-HES spectrometer system allows us to conduct the proposed 3rd generation (e,e’K+) hypernuclear spectroscopy even with 6 GeV and 12 GeV operation.