STUDY of Light -Hypernuclei by Spectroscopy of Two Body Weak Decay Pions Liguang Tang Department of Physics, Hampton University Jefferson National Laboratory (JLAB) PR10-001 @ PAC35, January 25, 2010, JLAB Mesonic Decay inside Nucleus Free: p + - 2-B: A Z A (Z + 1) + -
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STUDY of Light - Hypernuclei by Spectroscopy of Two Body Weak Decay Pions
STUDY of Light - Hypernuclei by Spectroscopy of Two Body Weak Decay Pions. Mesonic Decay inside Nucleus Free: p + - 2-B: A Z A (Z + 1) + -. Liguang Tang Department of Physics, Hampton University Jefferson National Laboratory (JLAB). - PowerPoint PPT Presentation
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STUDY of Light -Hypernuclei by Spectroscopy of Two Body Weak
Decay Pions
Liguang TangDepartment of Physics, Hampton University
Jefferson National Laboratory (JLAB)
PR10-001 @ PAC35, January 25, 2010, JLAB
Mesonic Decay inside Nucleus
Free: p +
-
2-B: AZ A(Z + 1) +
-
Electro-production of Hypernuclei and Hyperfragments from the Continuum
e e’
* K+
p
A (A-1)
Quasi-free production (Continuum)
e e’
* K+
p
A Y(A-1)
Production of Hyperfragment (Continuum)
N
e e’
* K+
p
Aa (Aa-1)
Production of Hyperfragment (Continuum)
Ab
N
Y(Ab-1)
e e’
* K+
p
A YA
Direct production of Hypernuclei
Background
A rich source of a variety of light hypernuclei for new findings and discoveries2B decay pion is used as
the tool
Decay Pion Spectroscopy for Studyof Light -Hypernuclei
p
e’
e12C
K+
12Bg.s.
12Cg.s. -
Weak mesonic two body decay
1- 0.02- ~150 keV
Ground state doublet of 12
BB and
Direct Production
Example:
Decay Pion Spectroscopy for Light and Exotic -Hypernuclei
p
e’
e
12C
12B*
K+
4He
-
Weak mesonic two body decay (~10-10s)
Access to variety of light and exotic
hypernuclei, some of which cannot be
produced or measured precisely
by other means
4H
Fragmentation (<10-16s)
Fragmentation Process
Example:
Examples from FINUDA7Li(K-
stop, -) 7Li
7Be spectroscopy from: 7
Li 7Be + - Spin/parity: 1/2+
12C(K-stop, -) 12
C 12
C(p) 11B +
p S
P
11C spectroscopy from: 11
B 11C + -
Spin/parity: 5/2+?
High precision on ground state light hypernuclei Resolution: ~130 keV FWHM; mass precision : < ±30 keV Precise binding energy Charge symmetry breaking
Linkage between structures of hypernuclei and nuclei Determining ground state spin/parity
Search for Isomeric low lying states (Isomerism) Study the drip line limit on -hypernuclei, such
as heavy hyper-hydrogen: 6H, 7
H, and 8H
Medium modification of baryon property – B(M1) from lifetime of ground and low lying isomeric states of hypernuclei
Decay Pion Spectroscopy for StudyLight -Hypernuclei
These are rich and the most fundamental but so far
unobtainable information needed for building the correct models for
YN and Y-Nucleus interactions
Top View of the Experimental Layout
Figure 6. Schematic top view of the experimental configuration for the JLAB hypernuclear decay pion spectroscopy experiment (Hall A).
Proposal to JLAB PAC35Study of Light Hypernuclei by Pionic Decay at JLab M. Christy, C. Keppel, M. Kohl, Liguang Tang (spokesperson), L. Yuan (spokesperson), L. Zhu, Hampton University, USAN. Grigoryan, S. Knyazyan, A. Margaryan (spokesperson), L. Parlakyan, S. Zhamkochyan, H. Vardanyan, Yerevan Physics Institute, ArmeniaO. Hashimoto, S.N. Nakamura (spokesperson), Tohoku University , JapanP. Baturin, W. Boeglin, P. Markowitz, J. Reinhold (spokesperson), Florida International University, USAP. Bosted, K. de Jager, R. Ent, H. Fenker, D. Gaskell, T. Horn, M. Jones, J. LeRose (spokesperson), G. Smith, W. Vulcan, S.A. Wood, JLAB, USAE. Cisbani, F. Cusanno, S. Frullani, F. Garibaldi (spokesperson), M.L. Magliozzi, Istituto Nazionale di Fisica Nucleare, Sezione di Roma, ItalyEd.V. Hungerford, Department of Physics, University of Houston, USAL. Majling, Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Czech RepublicB. Gibson, Los Alamos National Laboratory, USAT. Motoba, Laboratory of Physics, Osaka Electro-Comm. University, JapanB. Hu, J. Shen, W. Wang, X. Zhang, Y. Zhang, Nuclear Physics Institute, Lanzhou University, ChinaD. Androic, M. Furic, T. Petkovic, T. Seva, University of Zagreb, CroatiaA. Ahmidouch, S. Danagoulian, A. Gasparian, North Carolina A&T State University, USAG. Niculescu, I. Niculescu, James Madison University, USAM. Iodice, Istituto Nazionale di Fisica Nucleare, ItalyG.M. Urciuoli, Istituto Nazionale di Fisica Nucleare, Sezione di Roma1, ItalyR. De Leo, L. Lagamba, S. Marrone, Istituto Nazionale di Fisica Nucleare, ItalyH.J.Schulze, Istituto Nazionale di Fisica Nucleare, ItalyJ. Feng, Y. Fu, J. Zhou, S. Zhou, China Institute of Atomic Energy, ChinaY. Jiang, H. Lu, X. Yan, Y. Ye, P. Zhu, University of Science & Technology of China, China.
Summary High quality and high intensity CW CEBAF
beam at JLAB made possible for high precision hypernuclear programs, among which the decay pion program is unique.
The decay pion spectroscopy program will provide precise and fundamental information needed to significantly improve our understanding on YN and Y-Nucleus interactions.
A test run in the 6GeV period is important for the development of this program for the 12GeV period.
Unlike the mass spectroscopy program, this program does not request precision and stability on beam energy.