Japanese Activities in Nuclear Data Measurement Masayuki IGASHIRA - - PowerPoint PPT Presentation

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Japanese Activities in Nuclear Data Measurement Masayuki IGASHIRA - - PowerPoint PPT Presentation

Oct 26, 2022 375 likes •612 views

Japanese Activities in Nuclear Data Measurement Masayuki IGASHIRA Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology Nuclear Data Projects in Japan Previous Project (2002.12-2007.3) Measurement, Evaluation, Utilization

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SLIDE 1

Japanese Activities in Nuclear Data Measurement

Masayuki IGASHIRA

Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology

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SLIDE 2

Nuclear Data Projects in Japan

◎Previous Project (2002.12-2007.3)

Measurement, Evaluation, Utilization System

・Capture Measurement at KURRI Tokyo Tech (TIT), JAEA (JAERI, JNC), KURRI ・Fission Measurement at KURRI & Tohoku Tohoku, KURRI

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SLIDE 3

Nuclear Data Projects in Japan

◎Current Project (2005.12-2010.3)

Measurement, Evaluation, Sensitivity Analysis System, Benchmark Calculation

・Capture Measurement at J-PARC, etc. Hokkaido, Tokyo Tech, JAEA, KURRI ・Fission Measurement at KURRI & Tohoku Tohoku, KURRI ・Photo Nuclear Reaction Measurement at AIST JAEA, Konan, AIST ・Decay Data Measurement at JAEA & KURRI Nagoya, JAEA

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Nuclear Data Projects in Japan

◎Previous Project (2002.12-2007.3) ・Capture: Np-237, Am-241, 243 ・Fission: Np-237, Am-241, 242m, 243 ◎Current Project (2005.12-2010.3) ・Capture: Cm-244, 246, LLFP ・Photo Nuclear Reaction: Se-80, etc. ・Fission: Cm isotopes, etc. ・Decay Data: U-238, etc.

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SLIDE 5

Construction of a Beam Line at J-PARC MLF

  • Neutron-Nucleus Reaction Instrument (NNRI)
  • NNRI has been completed, and spectrometers

will be placed in August and November.

  • The first proton beam impinged the Hg target
  • n May 30, 2008. (single pulse: 0.4 T protons)
  • Beam line tests are scheduled in

June, September, and October.

  • Capture measurement will start in December.

Cm-244, 246, LLFP

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SLIDE 6

Capture & Photo Nuclear Reaction

  • 1. JAEA, Konan, AIST
  • 2. Kyushu & KURRI
  • 3. KURRI, JAEA, Tokyo Tech
  • 4. Tokyo Tech
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SLIDE 7

Examples of recent results

Measurements of neutron capture cross sections of MA and LLFP

Thermal neutron region Recent results by activation method:

237,238Np, 241,243Am, 80Se

Recent results by prompt γ method:

107Pd, 91,93Zr

Resonance region Recent results by TOF method using 4pGe spectrometer and 4p BGO spectrometer at Kyoto linac:

237Np, 241Am

Fast neutron region R&D is going on using Yayoi’s fast neutrons by activation method:237Np under analyses R&D is going on using proton induced neutrons, e.g. 7Li(p, n)7Be by TOF

Half life Previous us data JAEA data Refer erence ences

93 93Zr

Zr 1.53 1.53×10 106ｙ 1.3 < s0 < 4 4 b (Pomerance erance 1952) s0＝0.63 63±0.02 .02 b (Lower er Limit) JNST, 44, 21 (2007)

107 107Pd

Pd 6.5 6.5×10 106ｙ 1.8 1.8±0.2 0.2 b (Mughabgha habghab b 1981) s0＝9.16 16±0.27 .27 b (Lower er Limit) JNST, 44,103 (2007)

JAEA

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SLIDE 8

Measurements of photon induced cross sections using

Laser Compton scattering (LCS) photons and High-resolution High-energy photon Spectrometer, HHS, at AIST 1) Precise measurements of (g, n) cross sections: Recent results for 152Sm 2) High resolution measurements of (g, abs) cross sections: 28Si et al. 3) Precise measurements of photo- atomic cross sections: on going

Measurements of thermal neutron capture cross sections using

Multiple Prompt Gamma-ray Detector Apparatus, STELLA, at JAEA JRR-3 1) Nuclear level construction: Demonstration for 15N, 27Mg, etc. 2) Identification of ground-state transitions: 62Ni, etc. 3) Precise measurements of thermal neutron capture cross sections: on going

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SLIDE 9

Inclusive (g, X) Cross Sections

Kyushu Univ.& KURRI Difficult-to-measure nuclei: 129I, 3H, 14C, ... (b emitter) Change b emitter to g emitter Application to non-destructive assay of nuclear waste Kyoto Univ. Electron Linac Facility 30 MeV e- + Ta or Pt target Bremsstrahlung X ray (continuous energy) Sample:

129I, 99Tc, 238U, 88Y, 90Zr, 93Nb

Detector: Ge detector g ray spectrum for 129I(g, n)128I and 129I(n, g)130I

128I 130I

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SLIDE 10

Tokyo Tech

10 20 30 40 50 60 70 80 90 100 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Present JENDL-3.3 ENDFB/VII.0 ENDFB/VI-8.0 Capture Cross Section [b] Energy [keV] 10 100 1000 10

  • 2

10

  • 1

10 10

1

Present JENDL-3.3 ENDFB/VII.0 ENDFB/VI-8.0 Siddappa* (1972) Dillmann* (2006) Trofimov* (1986) Capture Cross Section [b] Energy [keV]

Se-77  Sn & Se Isotopes (Sn-126, Se-79) Cross Sections Gamma-Ray Spectra  Se-74

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SLIDE 11

2 4 6 8 10 12 10

  • 3

10

  • 2

10

  • 1

10 10

1

g-ray/Capture/MeV g-ray Energy [MeV]

2 4 6 8 10 10

  • 3

10

  • 2

10

  • 1

10 10

1

g-ray/Capture/MeV g-ray Energy [MeV]

Capture gamma-ray spectrum of Se-74 Capture gamma-ray spectrum of Se-77

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SLIDE 12

Fission

Tohoku University & KURRI

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SLIDE 13

Decay Data

Nagoya University & JAEA

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Beta-decay energy (Qb) measurements of fission products by development of total absorption detector

BGO

放射線源

100 mm

PMT

For Qb determination for new- isotopes, 3 types total absorption detectors have been developed.

Energy Counts per energy E1 Qb b

g 

b

E1 Qb b1 b2 g1

10 101 102 103 104 105 106 20 40 60 80 100 120 140 162Eu BG Subtracted Counts Energy

ISOMER 162Eu

In total absorption spectrum, the highest energy point indicates the Qb.

Objective:

Qb determination without decay scheme information of New isotopes!!

High efficiency, but energy resolution is ~60~100 keV

determination of Qb for fission products of

238U(p,f) with on-line mass separator

new isotopes !!

163-165Eu, 166Tb,

etc.

1st

st: Large volume BGO detectors

(12cmφ×10cmt×2)

E.Phys.J. A 34, (2007) 363-370.

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Others

  • 1. Kyushu University

(n,xn), (p,xp)

  • 2. Osaka University & JAEA

DDX of a-particle emission

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(n, xn) DDX @ LANSCE

Kyushu Univ.& LANL unfolding using moving source model 140 - 160 MeV, Fe(n,xn) LANSCE WNR: Spallation neutron source (< 800 MeV) Sample: Thin C, Al, Fe, In, Pb Thick Fe, Pb Detector: NE213, Phoswich type NaI(Tl) Incident neutron: TOF Outgoing neutron: Unfolding

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SLIDE 17

Experiments at RCNP and JINR (Russia)

  • Measurement of charged particle production cross sections at 300-

600MeV with crystal detectors

DDX of 208Pb(p,xp’) reaction

JINR RCNP NIRS Kyushu Univ.

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SLIDE 18

Experiments at HIMAC, NIRS

Flight path

Lead (5cm)

Continuous p, d, t, etc.

DE-E part

LYSO LYSO NE213 (DE) NE213 (Collimator) NE213

DE-E-TOF detector system MWPC

  • Development of innovative detector systems for medical application
  • Medical data measurement at 200-400 MeV/u

GEM

proton deuteron triton

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SLIDE 19

Recent activities of Osaka University group

  • I. Murata, H. Miyamaru, K. Kondo*

Division of Electric, Electronic and Information Engineering, Graduate School of Engineering, Osaka University under the collaboration with FNS group of JAEA

・Nuclear data measurements for fusion reactor development have been carried out with a pencil-beam DT neutron source

  • f FNS, JAEA.

・Precise α-particle emission double differential cross section (DDXα) for carbon has been measured. ・The branching ratio has been determined based on the kinematics analysis of the experimental results including the DDXn data by Takahashi et al.

* Post doctoral fellow of JAEA from 2008 April.

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Experimental arrangement for α emission DDX measurement

Energy: 14.2 MeV Flux: 6 ×105 n/s/cm2 Background flux is kept around several tens n/s/cm2 !

Ti-T target 200cm Pre-collimator Polyethylene Pb Fe D+ beam 350keV 20mA(max.)

Vacuum Chamber

Concrete Wall

2cm-f neutron beam qemission Sample

FNS facility of JAEA

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2 4 6 8 10 0.1 1 10 100 DDX [mb/sr/MeV]

a-particle energy [MeV]

Present expt. R.C.Haight et al.

20 deg.

GS 2.43 4.7

  • 1.0
  • 0.5

0.0 0.5 1.0 1 10 100

12C(n,n'+3a)

Ea1.0 MeV ADX [mb/sr] Emission angle in LAB system [cos unit]

Present expt. R.C.Haight et al.

2 4 6 8 10 0.1 1 10 100 DDX [mb/sr/MeV]

a-particle energy [MeV]

Present expt. R.C.Haight et al.

70 deg.

GS 2.43

1 2 3 4 5 6 7 8 9 10 10

  • 1

10 10

1

10

2

10

3

15deg. 20deg. 30deg. 40deg. 50deg. 70deg. 90deg. 110deg. 130deg. 150deg.

a

  • p

a r t i c l e e n e r g y [ M e V ] DDX [mb/sr/MeV]

a0

Obtained DDXα for carbon

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SLIDE 22

36% 4% 34% 13% 6% 6%

  • B. ratio

Reaction kinematics analysis with Monte Carlo technique for the 12C(n,n’+3a) reaction

  • Aim at experimental determination of the branching ratio

for inelastic scattering of 12C and 12C(n,a)9Be* reactions.

  • The branching ratio was determined by fitting measured

DDXa (Present) and DDXn (by Takahashi et al.).

Can contribute to nuclear data evaluation and nuclear model construction

30 deg. a-particles 30 deg. neutrons

2 4 6 10

  • 1

10 10

1

10

2

DDX [mb/sr/MeV]

a-particle energy [MeV]

Measurement SUM

9Be*(2.43) 9Be*(4.7)

9Be*(2.43) 9Be*(4.7)

2 4 6 10

  • 1

10 10

1

10

2

12C*(7.65) 12C*(9.64) 12C*(10.3) 12C*(10.84) 12C*(11.83)

Neutron energy [MeV]

12C*(9.64) 12C*(7.65)