Study of threenucleon force with a new experiment of a - - PowerPoint PPT Presentation

▶
study of three nucleon force with a new experiment of
SMART_READER_LITE
LIVE PREVIEW

Study of threenucleon force with a new experiment of a - - PowerPoint PPT Presentation

Jan 08, 2023 329 likes •501 views

NSMAT2016 Study of threenucleon force with a new experiment of a protondeuteron breakup reaction Yuya Akazawa , M. Fujita, R. Honda 1 , M. Ikeda, H. Kanauchi, K. Kobayashi 1 , T.Koike, K. Miki, K. Miwa, Y. Nakada 1 , S. Ozawa, Y. Sasaki,

slide-1
SLIDE 1

Study of three‐nucleon force with a new experiment of a proton‐deuteron break‐up reaction

Yuya Akazawa,

  • M. Fujita, R. Honda1, M. Ikeda, H. Kanauchi, K. Kobayashi1, T.Koike,
  • K. Miki, K. Miwa, Y. Nakada1, S. Ozawa, Y. Sasaki,
  • K. Sekiguchi, H. Tamura

Department of Physics, Tohoku University, Sendai , Japan

1Department of Physics, Osaka University, Osaka, Japan

NSMAT2016

slide-2
SLIDE 2

Contents

  • Introduction
  • 3NF study ← p‐d break-up reaction
  • Detector system “CATCH”
  • p‐d reaction experiment @ CYRIC
  • Experimental condition
  • Simulated result
  • Preparation status
  • Summary
slide-3
SLIDE 3

3NF and Neutron star

  • Importance of Three-Nucleon Force (3NF) for NS

Model dependent

  • A. Akmal, et al., PRC58, 1804 (1998)

neutron matter

2NF : realistic nuclear potential ⇐ 3000~4000 NN scattering experimental data

⇒ more experimental data needed for 3NF, YN, YY

ρ0

slide-4
SLIDE 4

Study of 3NF by a p‐d break‐up reaction

『p-d break-up reaction』

  • J. Kuros´-Z˙ołnierczuk et al., PHYSICAL

REVIEW C66, 024003 (2002)

S MeV

[mb/(sr2・MeV)] 2NN

One of the probes to reveal the nature of three-nucleon force (3NF).

p1 p2 n Φ12 p beam p1 p2 n

(E1,θ1) (E2,θ2)

beam

p+d→p+p+n

d target

θ1 θ2

2NF+3NF

Ebeam = 65 MeV

From side From back S : correlation between E1 and E2

slide-5
SLIDE 5

S (MeV)

Study of 3NF by a p‐d break-up reaction

Some observables ・Energy correlation dependence ・Reaction angular dependence (θ1,θ2) ・Φ12 dependence

(θ1,θ2) dependence Φ12 dependence

Detector with a large angle acceptance for multi-particles is required

(θ1,θ2)=(15°,15°) Φ12=180°

(25°,15°) (30°,15°) (25°,20°) (30°,20°)

※ θ±1°, Φ±5°

Φ12=40° Φ12=60° Φ12=120° Φ12=140°

  • S. Kistryn et al., Phys. Lett. B641, 23 (2006).

S (MeV)

  • S. Kistryn et al., Phys. Rev. C68, 054004 (2003).

2NF 2NF+3NF 2NF 2NF+3NF

Experimental data at 130 MeV d beam

slide-6
SLIDE 6

As the first step, we will take data with an 80 MeV p beam.

Current experimental data of p‐d reactions

⇒ new data points with our new detector system

80 MeV

MeV/nucleon beam

80 MeV 関口さん Courtesy of K. Sekiguchi

[1] K. Bodek et al., Few Body Syst. 30, 65 65 (2001) [2] St. Kistryn, et al., Phys. Rev. C 68, 054004 (2003) [3] H. Mardanpour, et al., Nucl. Phys. A 790 (2007), p. 426c etc.

RIKEN, RCNP, KVI, IUCF

next page

slide-7
SLIDE 7

“CATCH”

We will use this detector system for the p-d experiment. Advantages ・Large acceptance (∵surrounding the target) ・Many sets of (θ1,θ2,Φ12) in one experimental setup ・Multiple particle detection ・Particle ID (p/d/μ・π)

Cylindrical Fiber Tracker ・surrounding a target ・8 layers of scintillation fibers ・three dimensional tracking ⇒ measure the scattering angle (σ=1°) and the energy deposit (σ=20%@1MeV) BGO calorimeter ・surrounding the CFT ・24 BGO crystals (30×25×400mm3) are used ⇒ measure the kinetic energy (σ=1%@80MeV)

Cylindrical Active Tracker and Calorimeter system for Hyperon-proton scattering

Production finished soon

slide-8
SLIDE 8

“CATCH”

We will use this detector system for the p-d experiment. Advantages ・Large acceptance (∵surrounding the target) ・Many sets of (θ1,θ2,Φ12) in one experimental setup ・Multiple particle detection ・Particle ID (p/d/μ・π)

Cylindrical Active Tracker and Calorimeter system for Hyperon-proton scattering

Production finished soon d p

E(BGO) [MeV]

ΔE(Fiber) [MeV]

Cosmic ray

Prototype results

  • f pp, pC scattering

experiment

slide-9
SLIDE 9

p-d experiment @ CYRIC

  • Experimental condition
  • Simulated result
  • Preparation status
slide-10
SLIDE 10

p‐d reaction experiment with CATCH

Measurement of dσ/dΩ of the p-d elastic scattering and break-up reaction ⇒ new data for 3NF

Purpose Experimental setup

To be performed at CYRIC, Tohoku Univ. in January 2017 Elastic scattering p beam 80 MeV d’ p’ CFT BGO calorimeter D2 gas target 300 mm(t)

Commissioning of the CATCH system

p beam 80 MeV p p n Break-up reaction Event identification for elastic scattering and break-up reaction Simulation

slide-11
SLIDE 11

θ [deg.] E(CFT+BGO) [MeV] Simulated result (pd elastic) Ed’(θ) Kinematically calculated Ep’(θ)

Simulation

pd散乱も80 MeVのデータは 未測定⇒②-3

シミュレーション結 果(pd break-up)

beam

Event generation: p-d elastic scattering kinematics. Detector: CATCH configuration

※Energy resolution is taken into account. Event ID  p and d are clearly separated.

Simulated result (pd elastic) Total E [MeV] CFT ΔE [MeV] p d

Particle ID

Simulation: p‐d elastic scattering

 Identification of elastic scattering events using the kinematically calculated energy. p’ d’

slide-12
SLIDE 12

pd散乱も80 MeVのデータは 未測定⇒②-3

シミュレーション結 果(pd break-up)

beam dσ/dΩ can be obtained as a function of S for various combinations

  • f (θ1,θ2,Φ12)

Simulated result Missing Mass reconstructed from the two protons

 break-up reaction can be identified using Missing Mass of n

Ep1 vs Ep2

Simulated result (pd break-up)

Missing Mass (Event ID)

S axis

Ep1 [MeV] Ep2 [MeV]

Uniquely determined correlation

p_{low E} can’t be tracked.

※threshold can be decreased

Selecting (θ1,θ2,Φ12)

θ1=55±2.5° θ2=60±2.5° Φ=180±10°

Event generation: p-d break-up reaction

for several combinations of (θ ,θ ,E ,E p p n pd→ppX MassX

S MeV

Simulation: p‐d break-up reaction

 Energy acceptance：higher than 20 MeV for both Ep1 & Ep2

slide-13
SLIDE 13

Status of CATCH

BGO

Completed an assembly of CFT last week !!

BGO calorimeter is ready Half part (14 crystals)

400mm 400mm

4 straight + 4 spiral layers

CFT Angular resolution σθ≃1°(prototype) Efficiency ≃ 98% (3rd straight layer) ≃ 96%(3rd spiral layer) Energy resolution σE ≃ 1% for 80 MeV p Satisfactory performance

Two systems will be combined into CATCH next month

slide-14
SLIDE 14

p p n

400 mm beam p’

CATCH the new horizon

To be studied after commissioning of CATCH

Λp scattering 3NF

e same method as ∑p scattering except for

p-d, p-3He, etc… elastic scattering & break-up

Baryon-Baryon interaction Σp scattering

3NF (T=3/2)

Originally designed to be used for this experiment in J-PARC

p-d reaction experiments with CATCH is just a starting point

CATCH + spectrometers

Cylindrically Active Tracker and Calorimeter system for Hyperon-proton scattering experiment

slide-15
SLIDE 15
  • 3NF study for neutron star
  • p-d elastic scattering and break-up reaction are one of the probes.
  • dσ/dΩ of p-d reaction at 80 MeV beam will be new data.
  • New detector system CATCH
  • Suitable for this experiment because of its large acceptance
  • Consisting of a Cylindrical Fiber Tracker and BGO calorimeters
  • The first operation and application
  • Simulation
  • p/d are clearly discriminated.
  • p-d elastic scattering & break-up reaction are identified from the

kinematics and missing mass

  • Preparation
  • CATCH will be all constructed next month.

⇒ The experiment will be performed in Jan. 2017

Summary

slide-16
SLIDE 16
  • CATCH specification
  • z acceptance = 400 [mm]
  • Energy acceptance 5 ~ 180 [MeV]

※exchanging or adding crystals ⇒ maximum can be increased

  • Energy resolution σE(BGO) = 1% for 80 MeV

σE(CFT) = 20 % for 1MeV

  • Angular resolution σθ ≃ 1°
  • Time resolution(CFT) σtime ≃ 1 [ns]
  • Particle ID : p/d/μ,e,π

※depends on particle energy

If you have ideas or interests, please contact us.