Spectroscopic Study of Lambda Hypernuclei at JLab...Hyperon naturally appear at high density...
Transcript of Spectroscopic Study of Lambda Hypernuclei at JLab...Hyperon naturally appear at high density...
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Satoshi N. Nakamura
Tohoku University
Spectroscopic Study of Lambda Hypernuclei at JLab
26th September 2019
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10−15 m 104 m
Baryon(Hyper)Nucleus
Neutron Star
Baryon Interaction
Nuclear ForceNN scattering data
Hyperon ForceLimited YN scattering data
SUf(3) Symmetry
Hypernuclei
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Reliable 2BF potential
Precise Spectroscopy Light hypernuclei
Reliable Experiments on Hypernuclei
Shell ModelQuantum MCHyper AMDRel. MF …
Lattice QCD
HyperonScattering
Precise Spectroscopy Medium – Heavy hypernuclei
Cluster Calc.FaddeevNCSM
NS EOSSolution of Hyperon Puzzle
Various 3BF models
Baryonic Interaction Potentials
Meson BeamsElectron BeamsRI Beamsg spectroscopyDecay piEmulsion
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10−15 m 104 mA=3 A~1057
Λ3𝑛 Puzzle
CSB of L Hypernuclei Hyperon PuzzleHypertriton Puzzle
pn
Λ
Λn
nΛ
np
LL
?p
n
p
n
Shallow boundshort lifetime
Bound?Resonance?Not Exist?
Why massive NS exists?
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(e,e’K+)
Excellent mass resolution (~ 0.5 MeV)
Absolute energy calibrationp(e,e’K+) L, S0
(K-, p-)
(p+, K+)
1-2 MeV resolutionNormalized to 12
LC mass
Thin target (isotopically enriched)
eg. 40,48Ca, 3H
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0.5 MeV (FWHM)
1.45 MeV (FWHM)
12C(𝜋+,K+)12ΛC
KEK-PSE369
Absolute MM calibration
12LCgs energy from emulsion
0.7 MeV (FWHM)
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1.45 MeV (FWHM)
12C(𝜋+,K+)12ΛC
KEK-PSE369
Absolute MM calibration
12LCgs energy from emulsion
0.7 MeV (FWHM)
12C(e,e’K+)12ΛB
0.5 MeV (FWHM)
Λ12C (emulsion):= 10.76 ± 0.19MeV
Nucl. Phys. A (1988) 520.
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Two solar mass neutron stars
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Hyperon PuzzleBased on our knowledge on Baryonic Force:
Hyperon naturally appear at high density (r=2~3r0)
2𝑀⨀ Neutron Stars
Too Soft EOS
Contradictto
observation
Additional Force to make EOS stiff
AFDMC by Lonardoni
AFDMC by Lonardoni et al. PRL114 (2015) 092301, updated (2016)
ESC08c + 3B/4B RF : G-Matrix Calc. by Yamamoto et al., PRC 90 (2014) 045805.Variational Meth. + AV18+UIX by Togashi et al., PRC 93 (2016) 035808
J0740+6620 (2019/9/16 2.17 𝑀⨀sol, Green Bank Obs.)
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E12-15-003 accepted with GRADE A.
40Ca(e ,e′K+)40LK and , 48Ca(e, e′K+)48
LK
CT :Parameter to gaugeLnn contribution
in LNN potential
D.Lonardoni
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E12-15-008 (ready for beam, 2021)
New Pair Charge Sep. Mag. Ca targets holder
under construction
PCSM
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nn
Λ
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𝜦𝟑𝒏 ?
C. Rappold et al. (HypHI Collaboration),
Phys. Rev. C 88, 041001(R) (2013).
Resonance nnΛ may exist:
I.R.Afnan, B.F.Gibson, PRC 92, 054608 (2015)
H. Kamada et al., EPJ Web Conf. 113, 07004 (2016)
E. Hiyama et al., Phys. Rev. C 89, 061302(R) (2014)
A. Gal et al., Phys. Lett. B 736, 93–97 (2014)
Bound 𝜦𝟑𝒏 cannot be reproduced:
t + π decay with 𝜏 = 190−35+47ps
−𝐵Λ (𝑀𝑒𝑉)
Γ/2
(𝑀𝑒𝑉)
Res
on
ance
Bound State
I.R.Afnan, B.F.Gibson., PRC 92, 054608 (2015)
Additional binding energy from 3BF?
Lack of knowledge on Ln 2BF?
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𝜦𝟑𝒏, 𝒏𝒏𝚲 ?
𝛾∗
3H
n
p
Λn
n
n
K+
𝟑𝐇 𝐞, 𝐞′𝐊+ 𝒏𝒏𝚲
E12-17-003; Data taking successfully finished!
Detect
Detect
Missing Mass Spectroscopy
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Cell material:
Al alloy (ASTM B209 AL 7075-T651)
40 TBq (0.1 g, 0.082 g/cm2)
1.4 MPa at 295K
(0.3 MPa at 40K) 34 cc
Φ 12.7mm
Dave Meekins (JLab, 2015).
From Savannah River Lab.
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Cell material:Al alloy (ASTM B209 AL 7075-T651)
40 TBq (0.1 g, 0.082 g/cm2)
1.4 MPa at 295K (0.3 MPa at 40K)
⸗ 34 cc
𝜑 = 12.7 mm
Dave Meekins (JLab, 2015).
10 September : Refreshed T2 target arrived (T1/2 = 12.3 y)Beamtime 25Oct. - 25 Nov. (3He decay 0.7% - 1.2%, H2 contamination ~ 2% , Al wall)
Solid target t < 1mm
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New Analysis procedures are necessary.
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3𝑇 e, e′K+ nnΛ
SimulationAssum: BL = -0.5 MeVΓ = 0.5 MeV
E12-17-003 :
Analysis in progress
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Final MM spectrum
Acceptance Correction
Peak in bound region?
Obtain Re[E]
Peak in resonance region?
Obtain Re[E] and Im[E]
Deconv. Res. Func.
QF shape analysis
I.R.Afnan & B.F.Gibson, PRC (2015)
yes
yes
no
no
−𝐵Λ (𝑀𝑒𝑉)
Γ/2
(𝑀𝑒𝑉)
Res
on
anceBound State
Simulation
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Established (e,e’K+) spectroscopy of L hypernuclei at JLab
Study isospin dependence of L hypernuclei(approved, will be ready in 2021)
New magnets are under construction.
Study wide A (light:C2 approval; heavy: working)
Search for bound/resonance state of nnL
Analysis is in progress.
JLab hypernuclear programs are complimentary to HIHR programs in J-PARC HD Ex.