[PPT] - Experimental Progress in Strangeness Nuclear Physics Report from PowerPoint Presentation

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Experimental Progress in Strangeness Nuclear Physics — Report from Group A01&A02 —

T.Takahashi on behalf of Group A01 & A02 (KEK IPNS/J‐PARC Center) at NSMAT2016 (2016 Nov. 21)

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Introduction

2016/11/21 NSMAT2016 3

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r

Joint project between experiments, observations, theories

⇒ properties of neutron matter Theories

High Int. proto acc.

J-PARC

⇒ n-star radius

Unstable beam factory

RIBF Strangeness nuclear physics

Ｘ-ray observatory

ASTRO-H

Understand structure of n-star “Science of Matter based

n quarks”

Cold atoms n-rich nuclei

⇒ Interaction of hyperons

X-ray astronomy

World-best two accelerators and X-ray satellite

Nuclear matter EOS

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Expected 12

C spectrum

5 6 Λ Λ He 4He

t

Ξ-

p

π-

Λ He

10μ m 5 10 5

6 He hypernucleus

 hypernuclear spetrocopy

(Unique in the world)

nuclei from emulsion

(Unique in the world, 10 times improved)

N int.

→ EOS of high density matter

A01: Interactions of multi‐strangeness systems

Determine hyperon mixing in the inner core（> 30）

E05

Baryon fraction

fraction

Nakazawa、 Sumihama H.takahashi Takahashi, Naruki Sato, Imai, Takahashi, Naruki

 int.

Peak in  invariant mass

co correl elat ation

(Unique in the world)



 （density）

?

N→int. 

n

H dibaryon？

Hyperon spectrometer

TPC, S.C.magnet

E07 E42

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 coherent coupling n n  n n  

(1)

1) +p s p scattering（unique） Mi

Miwa, Ta Tamura

‐> n ( p) p) in int. t.

=> =>  exists in n‐star or not

(2a) (2a)  spectroscopy of  hypernuclei pernuclei

(Unique method ) Ko Koike, Ta Tamura

‐> Det Details ils of

f N,

N, NN NN in int.

(2b) (2b) n‐rich rich hypernuclei pernuclei

(Unique method) Sak

Sakagu guch chi, i, Aj Ajim imur ura, a, Fuk Fukuda uda

‐> nn nn int.

t. in

in n‐rich rich en envir vironmen ent

=> => Fr Fractio tion of

f  in n‐star

(3) (3) K‐ nuclear nuclear bound bound state states

Outa,, Suzuki

‐> Kbar

barN in

int.

t. in

in mat matter

=> => K co condensation in in n sta star?

A02: Strangeness in n-rich matter

E10 E15, E27

Determine hyperon mixing in =2~30 region where hyperons begin to appear

E40 E13

fraction

ρ n p 

n attractive n repulsive

?



   p  p/n

LH2 targ Fiber tr Ca PiID co Forward calorimeter

Ultra-fast (x100) Tracking detector Using MPPC

Sattered proton detector

K-

p p

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Hyperon Potential & Interactions knowledge in 2012 (at Kick-off sympo.)

: U = 30 MeV in normal (NZ) matter at 0 U ? in neutron‐rich matter  (, , ) : N int. is repulsive but how much?  ( , ) :  nucleus is not well established U = 14 MeV ? (12

Be)

B = 2.6 MeV ? (+14Ntwin ‐nucleus)  interaction: B = 0.67 ± 0.17 MeV from NAGARA event systematic data (A‐dependence) YY: N: Group‐A02 (S=1) Group‐A01 (S=2) to be established

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Progress of SNP (2012 - present)

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Progress (1) Discovery of Ξ nucleus

In the test application of Overall Scanning Method, which is under R&D for incoming E07 Experiment, to the emulsion sample irradiated before, we found the event in which  is deeply bound in 14N. This is the first evidence of ‐nucleus In the test application of Overall Scanning Method, which is under R&D for incoming E07 Experiment, to the emulsion sample irradiated before, we found the event in which  is deeply bound in 14N. This is the first evidence of ‐nucleus

 + 14N → 10

Be(#1) + 5 He(#2)



Newspaper （2015/1/19） Binding energy of  > 1.03±0.18 MeV c.f. 0.17 MeV（atomic orbit） 3.87±0.21 MeV if 10

Be is in ground state.

In E07, ~100 double‐strangeness events will be observed. ⇒ detailed information on S=‐2 interaction

In the R&D of E07 Discovery of ‐Nucleus for the first time – KISO Event –

Attractive N interaction has been established. PTEP 033D02 (2015)

⇒ K.Nakazawa

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Start of E07 (Emulsion exp.) at K1.8

KURAMA (260msr) installed at K1.8

momentum [GeV/c] K K

Beam was exposed to the 18/118 emulsion stacks in June 2016.

⇒ K.Nakazawa ⇒ S.Hayakawa & M.Fujita (poster)

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Progress (2): 12C(K-,K+) Pilot data

(K,K+) Missing mass spectroscopy using SKS M 6 MeV (FWHM)

Missing Mass (GeV)

1.3 1.3051.311.3151.321.3251.331.3351.341.3451.35

Counts /0.5 MeV

100 200 300 400 500

) at 1.8 GeV/c

+

, K

Missing mass p(K

) at 1.8 GeV/c

+

, K

Missing mass p(K

 previous data at BNL‐AGS M 14 MeV(FWHM)

P.Khaustov et al., PRC61 (2000)054603

⇒ S.Kanatsuki

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Progress (3): Neutron-rich Λ nuclei — No observation of 6

ΛH (J-PARCE10) —

t + 2n + 

0.0

4 H + 2n

‐2.04

5H + 

Glue like role of   coherent coupling

6 H Y.Akaishi et al. Phys.Rev.Lett.84(2000)3539

‐2.31 FINUDA

M.Agnello et al., FINUDA Collaboration PRL 108 (2012) 042501

6Li (  , K+ ) X

H.Sugimura et al. PLB729(2014)39

No peak structure in bound/resonance region U.L. 1.2nb/sr (90%C.L.)

⇒ R.Honda

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Progress (4) Charge Symmetry Breaking in ΛN interaction

‐ray spectroscopy at J‐PARC E13 counts/8 keV E [MeV]

4He(K,)

2015 Apr.‐May June

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Progress (4) Charge Symmetry Breaking in ΛN interaction

Large CSB of 1+‐0+ level spacing
spin‐dependent CSB
1+ : small/no
0+ : large
effect of N‐N mixing ?

T.O.Yamamoto et al. PRL115 (2015) 22501

decay  spectroscopy at MANI‐C 2.12±0.01stat.±0.09syst.

A.Esser et al. PRL114(2015)232501

Importance of Three‐Body Force

⇒ T.O.Yamamoto & S.Nagao ⇒ S.Yang , M.Nakagawa ( other E13 results )

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Progress (5) Observation of “K-pp”

J‐PARC E27 @K1.8 1405) doorway production at p=1.69 GeV/c d → K+X X → p → p → pp

Mx Y.Ichikawa et al. PTEP 2015 21D01

B = 95 (stat.) (syst.) MeV = 162 (stat.) (syst.) MeV

+18 17 +30 21 +87 45 +66 78

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Progress (5) Observation of “K-pp”

J‐PARC E15 @K1.8BR K 3He → X n at pK = 1.0 GeV/c X → p E151st E152nd

Y.Sada et al. PTEP (2016) 051D01

⇒ H.Outa

M[K+p+p] M[++N]

Two structures around M[K+p+p]!?

2013 May 2015 Nov.‐Dec.

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Large-Acceptance Hyperon Spectrometer for H-dibaryon Search (E42)

K C (diamond) → K+ H X H →  / p / p  → p

KURAMA K1.8BS Hyperon Spectrometer

large acceptance
high‐rate tolerance

(K) beam 1MHz

good invariant mass

resolution 1MeV Hyperon Spectrometer (HS)

S.C. Helmholtz magnet

1.0 T

TPC with 3 GEM layers

GET readout system

TOF hodoscopes
....
Target inside TPC

⇒ J.K.Ahn S.H.Kim (poster)

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Hyperon Spectrometer

S.C. Helmholtz magnet -

Max field: 1.5 T @ 99.9A Field region: 500mmφ×500mm Weight: 10 ton Conductive cooling by 2 GM cryocoolers All of necessary items (cryocoolers, monitors, power supply etc.) will be ready mid‐Dec. Then we will start cooling / excitation tests.

KEK‐Tsukuba Campus (ERL building)

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Hyperon Spectrometer - TPC -

Full set of TPC was fabricated and arrived at J‐PARC (Oct.2016)

Beam test at ELPH‐Tohoku, Nov.7‐10 The first cosmic‐ray event

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⇒ S.H.Kim (poster)

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CATCH for Σp Scattering Exp.

⇒ K.Miwa

() ()

p = n interaction

Liq.H2

Requirements

Large acceptance for scattered proton
High rate tolerance

 beam rate 10MHz

Kinematical identification of p scattering

energy and direction

Cylindrical Fiber Tracker (CFT) 4 layers for  & 4 layers for UV MPPC readout

BGO calorimeter shaping amplifier + flash ADC readout

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CATCH and its first application

p‐d elastic scattering and break‐up reaction experiment using CATCH will be performed at CYRIC‐Tohoku Jan.16‐17, 2017

⇒ Y.Akazawa

Cylindrical Fiber Tracker (CFT) BGO calorimeter

Construction of CATCH was just completed. 1st application to physics experiment

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Beam power & K- intensity (K1.8BL)

@38.6kW ( Nov. 2014 ) duration: 5.51 sec. spill length: 2.0‐2.1 sec. 4.43× 1013 ppp (optimal condition)

38.6kW (Nov. 2014) 41.5kW (Dec. 2014) (42kW) (June 2015)

53 kw x (s. f.) (next) limited by T1

24kW (Apr.2014) 33kW (June 2014)

Design of 80kW

target was finished

R & D of >100kW

target is underway

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Summary

 nuclei have been established.

KISO event (  14N )
12C(K‐,K+) missing mass spectrum with M6MeV

➡  potential / N interaction is attractive.

 in (neutron‐rich) nuclei

No observation of 6

H ↔ Prediction of Theory

Large C.S.B. in 4

He / 4 H system

➡ suggests importance of T.B.F. via N‐N mixing

 Kpp bound state exists ! New detectors have been developed / under

construction for near future experiments

Hyperon Spectrometer , CATCH

2016/11/21 NSMAT2016 23

Experimental Progress in Strangeness Nuclear Physics — Report from Group A01&A02 —

T.Takahashi on behalf of Group A01 & A02 (KEK IPNS/J‐PARC Center) at NSMAT2016 (2016 Nov. 21)

Contents

Introduction

Joint project between experiments, observations, theories

A01: Interactions of multi‐strangeness systems

?

(1)

A02: Strangeness in n-rich matter

?

Hyperon Potential & Interactions knowledge in 2012 (at Kick-off sympo.)

: U = 30 MeV in normal (NZ) matter at 0 U ? in neutron‐rich matter  (, , ) : N int. is repulsive but how much?  ( , ) :  nucleus is not well established U = 14 MeV ? (12

B = 2.6 MeV ? (+14Ntwin ‐nucleus)  interaction: B = 0.67 ± 0.17 MeV from NAGARA event systematic data (A‐dependence) YY: N: Group‐A02 (S=1) Group‐A01 (S=2) to be established

Progress of SNP (2012 - present)

Progress (1) Discovery of Ξ nucleus

In the R&D of E07 Discovery of ‐Nucleus for the first time – KISO Event –

⇒ K.Nakazawa

Start of E07 (Emulsion exp.) at K1.8

⇒ K.Nakazawa ⇒ S.Hayakawa & M.Fujita (poster)

Progress (2): 12C(K-,K+) Pilot data

(K,K+) Missing mass spectroscopy using SKS M 6 MeV (FWHM)

⇒ S.Kanatsuki

Progress (3): Neutron-rich Λ nuclei — No observation of 6

⇒ R.Honda

Progress (4) Charge Symmetry Breaking in ΛN interaction

‐ray spectroscopy at J‐PARC E13 counts/8 keV E [MeV]

Progress (4) Charge Symmetry Breaking in ΛN interaction

Importance of Three‐Body Force

Progress (5) Observation of “K-pp”

J‐PARC E27 @K1.8 1405) doorway production at p=1.69 GeV/c d → K+X X → p → p → pp

B = 95 (stat.) (syst.) MeV = 162 (stat.) (syst.) MeV

Progress (5) Observation of “K-pp”

J‐PARC E15 @K1.8BR K 3He → X n at pK = 1.0 GeV/c X → p E151st E152nd

⇒ H.Outa

Two structures around M[K+p+p]!?

Large-Acceptance Hyperon Spectrometer for H-dibaryon Search (E42)

K C (diamond) → K+ H X H →  / p / p  → p

(K) beam 1MHz

resolution 1MeV Hyperon Spectrometer (HS)

1.0 T

GET readout system

⇒ J.K.Ahn S.H.Kim (poster)

Hyperon Spectrometer

Max field: 1.5 T @ 99.9A Field region: 500mmφ×500mm Weight: 10 ton Conductive cooling by 2 GM cryocoolers All of necessary items (cryocoolers, monitors, power supply etc.) will be ready mid‐Dec. Then we will start cooling / excitation tests.

Hyperon Spectrometer - TPC -

Beam test at ELPH‐Tohoku, Nov.7‐10 The first cosmic‐ray event

⇒ S.H.Kim (poster)

CATCH for Σp Scattering Exp.

⇒ K.Miwa

p = n interaction

CATCH and its first application

⇒ Y.Akazawa

Construction of CATCH was just completed. 1st application to physics experiment

Beam power & K- intensity (K1.8BL)

Summary

➡  potential / N interaction is attractive.

➡ suggests importance of T.B.F. via N‐N mixing

construction for near future experiments