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Strangeness Nuclear Physics
Tohoku University
Japan Atomic Energy Agency
H. Tamura
2018.11.13
QNP2018
J-PARC
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J-PARC
Contents
1. Introduction
2. g-ray spectroscopy L hypernuclei at J-PARC
3. Charge symmetry breaking (J-PARC+MAMI+JLab+DAFNE)
4. S = -2 systems at J-PARC
X and LL hypernuclei, X atomic X-rays
5. Future plans – Challenge to the hyperon puzzle
6. Summary
Not covered: New K-pp data from J-PARC
X-p, LL correlation at ALICE
3LH lifetime puzzle, nnL bound state?
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1. Introduction
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How are nuclei formed from hadrons?
Origin of “Matter” ― Problems in low energy QCD
Nuclei
Hadrons
Neutron stars
QCD
Quarks/gluons
How are hadrons formed
from quarks and gluons?
How does nuclear matter
change at higher density?
=> can be answered with
strangeness as a probe
How the hadron-hadron
interactions (incl. nuclear force)
should be understood?
Do hadron properties and
structure change in nuclear
matter?
Key questions to bridge
hadrons and nuclei to QCD
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How are nuclei formed from hadrons?
Origin of “Matter” ― Problems in low energy QCD
Nuclei
Hadrons
Neutron stars
QCD
Quarks/gluons
How are hadrons formed
from quarks and gluons?
How does nuclear matter
change at higher density?
=> can be answered with
strangeness as a probe
How the hadron-hadron
interactions (incl. nuclear force)
should be understood?
Do hadron properties and
structure change in nuclear
matter?
Key questions to bridge
hadrons and nuclei to QCD
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Baryon Baryon interaction with strangeness
Strong repulsive core
+p (S=1, T=3/2)
quark Pauli effect
NN force
(27)
(10*)
(8s)
(10)
(8a)
(1)
8〇8 =x
BB forces
Lattice QCD, T. Inoue et al.Prog. Theor. Phys. 124 (2010) 4
Attractive CoreFlavor singlet (H-Channel)
color magnetic
interaction
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np
L
X
Hyperons (L at least) should appear at r ~ 2-3 r0
EOS’s with hyperons too soft to support massive NS’s (~2.0 Msun)
M
NS radius (km)
NS
mass
Strong repulsion in three-body
force including hyperons,
NNN, YNN, YYN, YYY ?
Phase transition to quark matter ?
(quark star or hybrid star)
Quark matter
+Hyperons
“Hyperon puzzle” in neutron stars
PSR J0348-0432 (2013) 2.01±0.04 Msun
PSR J1614-2230 (2010) 1.97±0.04 Msun
We need to understand YN, YY, KbarN interactions
both in free space and in nuclear medium
Ignore hyperons
??n
=> Unknown repulsion at high r ? -- No experimental info.
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2. g-ray spectroscopy of
L hypernuclei at J-PARC
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Hypernuclear g-ray data (2015)
Hyperball:1998~
Hyperball2: 2004~
6.0501-
2-3/2-
M1
PTEP (2015) 081D01
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Hypernuclear g-ray data (2015)
Hyperball:1998~
Hyperball2: 2004~
6.0501-
2-3/2-
M1
PTEP (2015) 081D01
LN spin-dependent interaction strengths determined:
D = 0.33 (A>10), 0.42 (A<10), SL = -0.01, SN = -0.4, T =0.03 MeV
• Almost all p-shell levels are reproduced within a few 10 keV
by this parameter set. (D.J. Millener)
• Feedback to BB interaction models. Nijmegen ESC08 model is
almost OK for LN.
LN-N force is not well studied yet. => s-shell hypernuclei
LN interaction in nuclear matter? => heavier hypernuclei
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K-
*Z),(Z AA
L
-- K
Detect g-rays from hypernuclei
Tag production of hypernuclei
K1.8 Beamline
Spectrormeter
J-PARC E13 Setup
g LZA-
(2.5 T)
Pion
spectrometer“
SksMinus”
Ge array“Hyperball-J”
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4LHe Result
Missing mass of 4He(K-,-)
4LHe (0+ + 1+)
g-ray energy (keV)
Doppler shift correction
4He(K-,-) missing mass
A peak observed at
1406±2±2 keV
4LHe
K-
-
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Bedjidian et al.
PLB 83 (1979) 252
etc.
Energy levels of A=4 mirror hypernuclei
4LH
p n
L
4LHe
T.O. Yamamoto et al.,
PRL 115 (2015) 222501
A large Charge Symmetry Breaking effect is confirmed!
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Mass-gated g-ray spectra
19LF (sL) region
Doppler broadened => M1 (or E1)
Not Doppler broadened => E2
Not Doppler broadened
19LF result:
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Level scheme of 19LF
*
A. Umeya and T. Motoba, Nucl. Phys. A954 (2016) 242.
Shell model calculation with NSC97f interaction*
E1
E2
46.9 ps
19.1 ps
This E1 is very slow
1.77 fsfast
fast
fast
slow slow
slow
Assigned from the peak width (Doppler broadening or not) and the expected yield.
slow: No Doppler broadening ( > 1 ps )
fast: Doppler broadening ( < 1 ps )
S. Yang et al., PRL 120 (2018) 132505
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Comparison with theoretical calculations
16O core
n
p
Lsd orbit
16O core
n
pL
sd orbit
g.s. doublet (3/2+,1/2+) spacing
LN interaction
Millener 305 keV Effective spin-spin interaction strength from p-shell hypernuclear data (D=0.33 MeV)
Umeya 346 keV [NSC97e] + [NSC97f], the ratio adjusted to reproduce 7LLi (3/2+,1/2+) spacing
( 245 keV [NSC97e], 419 keV [NSC97f] )
Exp. 316 keV
=> The level energy is reproduced very well, suggesting that
the theoretical framework and inputs (LN interaction) are good even for heavier hypernuclei.
-> We can extract LNN force effect from heavier hypernuclear data.
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A-dependence of
LN interaction strength
sLsN
sLpN
sLdN
Sensitive to wavefunction overlap and
interaction range
0.315 MeV
1.406 MeV
PRL 115 (2015) 222501
PRL 84 (2000) 5963
PRL120 (2018) 132505
r (sL-dN) > r (sL-pN) > r (sL-sN)
New!
New!Consistently understood.
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3. Charge symmetry breaking
in L hypernuclei
(J-PARC+MAMI+JLab+DAFNE)
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Bedjidian et al.
PLB 83 (1979) 252
etc.
4LH
p
n
L4
LHe
T.O. Yamamoto et al.,
PRL 115 (2015) 222501
Lp ≠ Ln: challenge to our understanding of BB interactions
-
Measured at Maniz
Old emulsion dataM. Juric et al. NPB 52 (1973) 1
DE(4LHe) - DE(4
LH) = 320 keV >> B(3H)-B(3He) ~70 keV
Energy levels of A=4 mirror hypernuclei
How to confirm?
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Decay-pion spectroscopy at Mainz
decays of quasi-free
produced hyperonaccidental background
A. Esser et al., PRL 114 (2015) 12501
Slide by P. Achenbach
Present data
New method of precise mass measurement developed.
Emulsion data in
binding energy scale
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Decay-pion spectroscopy at Mainz
decays of quasi-free
produced hyperonaccidental background
A. Esser et al., PRL 114 (2015) 12501
Slide by P. Achenbach
Present data
New method of precise mass measurement developed.
Emulsion data in
binding energy scale
=> BL [ 4LH ] = 2.12±0.01±0.09 MeV
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DBL(1+) : 0.03±0.05 MeV0.11±0.09 MeV
DBL(0+) : 0.35±0.05 MeV 0.26±0.09 MeV
T.O. Yamamoto et al.,
PRL 115 (2015) 222501
BL [ 4LH(0+) ] is confirmed, suggesting the emulsion 4LHe(0+) data also reliable.
Large spin dependence in CSB found.
Combined Results
A. Esser et al.,
PRL 114 (2015) 12501
Recent theories: This CSB effect is sensitive to LN-N coupling.
A. Gal, PLB 744 (2015) 352
D. Gazda and A. Gal, PRL 116 (2016) 122501L
L
0
N
N
L coupling
CSB
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High resolution (e,e’K+)
spectroscopy at JLab
Jlab E05-115
T. Gogami et al., PRC 93 (2016) 034314
L. Tang et al.,
PRC90 (2014) 034320
DE = 0.5 MeV (FWHM) achieved
T. Gogami et al., PRC 94 (2016) 21302(R)
12L B
7L He 10
L Be Accuracy of
absolute energy
in (e,e’K+)
~ 100 keV
c.f. (+,K+), (K-,- )
~ 1 MeV
Jlab Hall C
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DAFNE (K-stop,-), JLab (e,e’K+), and emulsion data
E. Botta et al., Nucl.Phys. A960 (2017) 165.
Suggesting small (~100 keV) CSB effect in p-shell hypernuclei Consistent with L- effects in p-shell << s-shell (Gal, Millener,..) Need more precise data
CSB effect in s- and p-shell hypernucleiSlide by E. Botta
Phys. Lett. B 725, 445 (2013).
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4. S=-2 systems at J-PARC
X and LL hypernucleiX atomic X-rays
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Emulsion Results (KEK E373)
a
X-N is attractive !
DBLL= 0.67±0.17 MeV
H. Takahashi et al., PRL 87 (2001) 212502
6LLHe -> 5
LHe + p + -
p L
nNagara event
L-L is weakly attractive
K. Nakazawa et al. PTEP 2015, 033D02
=-
p8Li
8Be
a
a
p d
e
Kiso event
The first clear X hypernucleus
X- + 14N -> X15C -> L
10Be + L5He
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More S=-2 events with emulsion J-PARC E07K. Nakazawa et al.
K-
K+
TOF wall
KURAMA spectrometer
Emulsion
SSD
Emulsion Sheets
K+
X-
Target
K-
1.8GeV/c
Ge detector
X-ray
Ge arrayL
X-
L
LL hypernucleus
twin L hypernuclei
X-atomic X-rays
Collect ~102 LL hypernuclear events from ~104 X-stop
Confirm LL int. and extract LL-XN effect
More X-nuclear events -> X-N interaction
Measure X- -atomic X-rays for the first time Shift and width of X-rays -> X-nuclear potential
Drastically reduce the background using emulsion image
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More S=-2 events with emulsion J-PARC E07K. Nakazawa et al.
K-
K+
TOF wall
KURAMA spectrometer
Emulsion
SSD
Emulsion Sheets
K+
X-
Target
K-
1.8GeV/c
Ge detector
X-ray
Ge arrayL
X-
L
LL hypernucleus
twin L hypernuclei
X-atomic X-rays
Collect ~102 LL hypernuclear events from ~104 X-stop
Confirm LL int. and extract LL-XN effect
More X-nuclear events -> X-N interaction
Measure X- -atomic X-rays for the first time Shift and width of X-rays -> X-nuclear potential
Drastically reduce the background using emulsion image
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KEK-PS E373 E07 (current)
X- stop with nuclear fragment 430 920Double + twin 7+2 8+6
So far, 30% of the total emulsion sheets has been scanned. More than twice of KEK E373
8 LL hypernuclear events
6 twin L hypernuclear events
E07 emulsion under analysis
X- + 14N -> X15C -> L
10Be + L5He
(Same as KISO event)
For some events, hypernuclides are identified.-> To be published.
First-round scan will be finished next spring
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Preliminary X-ray spectrum
Analyzed by M. Fujita
s and r-stop events selected
(1500 X stop)
Simulation after full emulsion analysisbased on the real background level
X-ray spectrum after selecting X- absorptionevents from emulsion image
In-beam energy calibration of Ge detectors successfully done within ±100 eV accuracy using LSO scintillator (167Lu) and 22Na source
Ag373
Ag255
Br206
Br317
real data
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5. Future plans
Challenge to the hyperon puzzle
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2. L binding energy in neutron matter (T=1 Lnn force) 40Ca, 48Ca (e,e’K+) 40
LK, 48LK at JLab Hall A ― will run in ~2020
How to approach the hyperon puzzle?
1 . YN, YY scattering/correlation data=> ・Separate between 2-body force in free space and
many-body force in nuclear matter・Input to chiral EFT force -> ab-initio calc.
±p scattering at J-PARC (E40) ― started runningLp scattering at JLab CLAS ― under analysisYN, YY correlation at ALICE ― 100 times statistics in the next run
3. Density dep. of L binding energy (LNN repulsion)Precise BL values for wide A via (e,e’K+) or (+,K+)
― Need a new beam line at J-PARC
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Effect of LNN force on L binding energies
Hypernuclear L binding energy data provide information on LNN force
Precise BL data for wide A
=> density dependence
MPa
sL
pL
dLfLgL
-BL
[MeV
]
ECS08 only(no 3B force)
+ 3B/4B repulsion in NNN +YNN etc.
D. Lonardoni et al.
40LK
48LK
CT : Lnn (T=1) strength
L binding energy in SNM ≠ in PNM ??Yamamoto, Furumoto, Rijken et al.PRC88 (2013) 2, 022801, PRC90 (2014) 045805
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Effect of LNN force on L binding energies
Hypernuclear L binding energy data provide information on LNN force
Precise BL data for wide A
=> density dependence
MPa
sL
pL
dLfLgL
-BL
[MeV
]
ECS08 only(no 3B force)
+ 3B/4B repulsion in NNN +YNN etc.
D. Lonardoni et al.
40LK
48LK
CT : Lnn (T=1) strength
L binding energy in SNM ≠ in PNM ??Yamamoto, Furumoto, Rijken et al.PRC88 (2013) 2, 022801, PRC90 (2014) 045805
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Extension Plans of J-PARC Hadron Hall
• < 2.0 GeV/c
• ~106 K-/spill
Muon
• 30 GeV proton
• <31 GeV/c unseparated
2ndary beams (mostly pions),
~107/spill
• < 1.1 GeV/c
• ~105 K-/spill
• < 1.2 GeV/c
• ~106 K-/spill
• <10 GeV/c separated
pion, kaon, pbar
• ~107/spill K-
• 5 deg extraction
• ~5.2 GeV/c K0
• Good n/K
• < 2.0 GeV/c
• 1.8x108 pion/spill
• x10 better Dp/p
105 m
High precision
L hypernuclear spectroscopy
g-ray spectroscopy
weak decays
LN scattering
LL, X hypernuclei
H dibaryon
S= -1 Systems
S= -2 Systems
Requesting a budget…
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Extension Plans of J-PARC Hadron Hall
• < 2.0 GeV/c
• ~106 K-/spill
Muon
• 30 GeV proton
• <31 GeV/c unseparated
2ndary beams (mostly pions),
~107/spill
• < 1.1 GeV/c
• ~105 K-/spill
• < 1.2 GeV/c
• ~106 K-/spill
• <10 GeV/c separated
pion, kaon, pbar
• ~107/spill K-
• 5 deg extraction
• ~5.2 GeV/c K0
• Good n/K
• < 2.0 GeV/c
• 1.8x108 pion/spill
• x10 better Dp/p
105 m
High precision
L hypernuclear spectroscopy
g-ray spectroscopy
weak decays
LN scattering
LL, X hypernuclei
H dibaryon
S= -1 Systems
S= -2 Systems
Requesting a budget…
(+,K+) at HIHR @J-PARC
DE = 0.3 MeV (FWHM)
expected
DE = 1.6 MeV (FWHM)
PRC64 (2001) 044302
(+,K+) @KEK
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g-ray measurement for 4LHe(0+->1+), and decay-pion measurement
for 4LH-> 4LHe - confirmed a large CSB effect in A=4 hypernuclei.
g-ray data of 19LF provided its level scheme, which is well reproduced
by theoretical calc’s with our knowledge of LN interaction.
(e,e’K+) data at JLab and (K-stop,-) data at DAFNE suggest little CSB
effects in p-shell hypernuclei
X-nucleus bound system (X-14N) was observed in emulsion.
A new emulsion experiment for more LL and X hypernuclei +
X-atomic X-rays has been performed. Many S=-2 events are found.
We will challenge the “hyperon puzzle” at JLab and at the extended
Hadron Hall at J-PARC.
6. Summary