Hypernuclear photoproduction and test of elementary amplitudes
JLab Hypernuclear Workshop 27 th May 2014
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Transcript of JLab Hypernuclear Workshop 27 th May 2014
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JLab Hypernuclear Workshop27th May 2014
Satoshi N Nakamura, Tohoku University
Perspectives at Jefferson LabMedium mass hypernuclei
HKSHES
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Study of hypernuclei
High quality medium heavy hypernuclear spectroscopy
Single particle nature of L in nuclear mediumA dependence of L potential
ls force vs. core-config. MixingInputs for mean-field theories
Collective motion of core nucleus
Tri-axial deformation of core nucleus
Modify nature of core Energy level inversion Glue like role of L
L in nuclear medium
L as an impurityL as a probe
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Objectives --- Hypernuclear Physics
Medium - Heavy hypernuclei
Light Hypernuclei (s,p shell)
A 1 20 50 200 1057
Elementary ProcessStrangeness electro-production
CSB, LS coupling in large isospin hypernuclei
Hyperonization Softening of EOS ?
Single-particle potentialDistinguishability of a L hyperon
U0(r), mL*(r), VLNN, ...
Neutron/Hyperon star,Strangeness matter
Extend Nuclear Force to Baryon Interaction
Use L as a probe to see deep inside of nucleus
Medium Heavy
Hypernuclei
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Precise spectroscopy of HYSingle Particle Model is OK to some extent
Hadron keeps its identities
Baryon Constitute Quark Model
HypernucleiSingle Particle Model
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Precise spectroscopy of HY
NucleonValence quarks
QCD vacuumSea quarks, gluons
HypernucleiLambda particle
Nuclear mediumCore’s properties, density
Light HypernucleiBaryon InteractionModification of core
Heavy Hypernuclei Lambda’s behavior in nucleus
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Proposed Programs1. Elementary L, S0
Reliable data 1H(e,e’K+)L, S0 in low Q2
2. Few-body 2D(e,e’K+) [LN] Exotic bound state, LN int. 4He(e,e’K+)4
LH LN CSB 3. Medium-heavy
40,44,48Ca(e,e’K+) 40,44,48LK L’s S.E., iso-spin
27Al(e,e’K+) 27LMg Tri-axial deformation
48Ti(e,e’K+) 48LSc Level inv. due to L
4. Heavy208Pb(e,e’K+) 208
LTl L in heaviest nucleus 5. Decay p
Weak decay of light hyper-fragments
6,7Li(e,e’K)6LHe, 7
LHe
3t(e,e’K)[nnL]19F(e,e’K)19
LO
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Hypernuclear Chart
K40L K44
L K48L
K40L
[LN]
L
Tl208L
H4L
MgL27
B12L
OL19
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1. Ca (e,e’K+) LK
Missing in (e,e’K) dataComplete A dependence of L S.P.Energy
Doubly LS closed 40Ca target
Clean Spectrum
isotope effect of core nuclei: 40Ca, 44Ca , 48Ca targets
P.Bydzovsky et al. NPA881 (2012)199.
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2. 27Al (e,e’K+) 27LMg
Tri-axially deformed 26Mg core + L in p-shell
9LBe = a + a + L
Genuine hypernuclear state
Totally new method to search shape of nucleus with L!
M.Isaka Yesterday’s talk
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3. 19F target : simplest sd-shell
A’s: p1/2-hole series, B’s: p3/2-hole series
T. Motoba, C2C WS Barcelona (2012)
Study of core-dynamics
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Measured hypernuclei & expected A dependence
E05-115L40K
L27Mg
89Y139La 208Pb
L19O
InteractionCharacteristics of Core
L in medium
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Few-body physics with strangeness1. 6Li (e,e’K+) 6
LHe
α
Λ
n
r.m.s α-Λ 2.8 fm α-n 5.0 fm
Larger than 6He
Three-layer structure
E.Hiyama : Yesterday’s talk
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2. 7Li (e,e’K+) 7LHe
0+
2+
α+n+n0 MeV
6He
-0.98
1.797 MeV
Γ=113 ±20 keV
(2+,1-,0+)?
Γ= 12.1 ±1.1 MeV
Exp.1/2+
3/2+5/2+
5He+n+nΛ
α+Λ+n+n0 MeV
-6.19 MeV
-4.57
neutronhalo states
-3.12
-1.88 Γ=0.7 MeV5/2+
3/2+ -2.04, Γ=0.5 MeV
7HeΛ
2+
Λ
E.Hiyama : Yesterday’s talk
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Few-body physics with strangeness
Established lightest hypernyclei = 3LH
Hyp-HI experiment at GSI a structure in d + p- , t + p- invariant mass
T.R.Saito, NUFRA2011
2d(e,e’K+)[nL]Indication of a nL , nnL bound state ?
3. Search of [nL] bound state and study of n-L interaction through FSI.
Direct method to search or set upper limit on this exotic system.
3t(e,e’K+)[nnL]
C.R
appo
ld e
t al.
PR
C88
, 041
001(
R) (
2013
)
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Few-body physics with strangeness
2d(e,e’K+) nL
2. Study of n-L interaction through FSI.
2d(e,e’K+) provides also information of n-L interaction through FSI.
R.A.Adelseck & L.E.wrightPRC 39(1989) 580.
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Few-body physics with strangeness4. Charge Symmetry Breaking of LN interaction
A=4,iso-doublet hypernuclei
A=7,iso-triplet hypernuclei
JLab E01-011 (HKS)
Recently measured at JLab Hall-C
Phenomenological CSB potential
Introduced to explain A=4.
NOT becessary for A=7.
Re-check of A=4 system
Decay p
4He(e,e’K+) 4LH
E13 @ J-PARC
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SummaryMedium heavy hypernuclear study
Ca targets : 40Ca doubly closed, clean, 44Ca 27Al target : 27
LMg tri-axial deformed19F targets: simplest sd-target, excited-core
Other targets : SPE of L with <100 keV accuracy
Few-body hypernuclear study6Li target : 6
LHe n-halo hypernucleus7Li target : 7
LHe unbound states of 6He d target : Exotic nL state, FSI nL study
CTn target : Exotic nnL state
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Subtraction of 12C effects and Accidental BG
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Expected Yields
>5 times more yield than E94-107Much better S/N than E05-115
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Expected Mass Resolution
Calibration for independent K, e’ spectrometers.Established in E94-107.
Absolute missing mass calibration with L,S0 massesEstablished in E05-115.