Development of elemental analysisby muonic X-ray measurement in J-PARC

K. Ninomiya1, T. Nagatomo2, K. M. Kubo2, P. Strasser3, N. Kawamura3, K. Shimomura3, Y. Miyake3, T. Saito4 and W. Higemoto11 Japan Atomic Energy Agency2 International Christian University3 High Energy Accelerator Research Organization4 National Museum of Japan History

MUSE Elemental Analysis Group

It is expected that muon irradiation and muonic X-ray detection can be applied to non-destructive elemental analysis [1]. In this study, to develop the elemental analysis by muonic X-ray measurement and to investigate the molecular effects on the muonic atom formation, we constructed a new X-ray measuring system in J-PARC.We performed muon irradiation for Tenpo-koban (provided from National Museum of Japan History) for test experiment of elemental analysis. Some muonic lines originated from muon transition in muonic silver and gold were identified, and we determined the component of Tenpo-koban (Au:51%) by muonic X-ray intensities.

Abstract

Introduction

Experimental conditionJ-PARC, MUSE, port-D2sample: tenpo-koban (old Japanese coin)muon momentum: 40MeV/ca number of incident muon:

~10 muons/pulseirradiation time: ~ 4 h

Muonic atom is atom like system that contains negatively charged muon instead of an electron. The energies of muonic X-rays are very large (keV-MeV) because of the large mass of muon (207 times larger than that of an electron). Such high energy X-rays can pass long range without photo absorption, so muonic X-ray detection is expected as a new elemental analysis method for bulk sample without destruction. Figure: Formation and muon cascading process of muonic atom

electronmuon

nucleus

muonic X rayelectronic X ray

muon capture

muon cascade

Introduction

Experimental

Results Discussion

Figure: Experimental setup of this study

Tenpo-koban

From muonic X-ray spectra, Tenpo-koban is Ag-Au alloy

Atomic muon capture ratio for Ag-Au alloy: A(Au/Ag)

Results Discussion

References

Muonic X-ray emission provability per muon

Following information is required for quantitative elemental analysis

Calculated from cascade code[2]

The Z-low (A(Z1/Z2)=Z1/Z2 [3]) is not suitable for most of alloys.Following empirical equation well reproduce the atomic capture ratio for Nb-Ta alloy [4], so we use this equation.A(Z1/Z2)=0.66x(Z1/Z2)[5], for Ag-Au alloy A(Au/Ag)=1.11

Contents of tenpo-kobanOur result is well reproduced the result for general tenpo-koban (Au: 57%) and for the same tenpo-koban from prompt gamma-ray analysis by neutron irradiation on J-PARC NOBORU (Au:54%)[6].

Figure: Muonic X-ray spectrum from germanium detector-2

Table: Muonic X-ray peak analysis for germanium detector-1 and 2

germanium detector-1

germanium detector-2

Au: 51±8 %

[1] H. Daniel, Nucl. Instr. Meth. B3 65(1984)[2] V. R. Akylas and P. Vogel, Comput. Phys. Comm., 15, 291 (1978)[3] E. Fermi and E. Teller, Phys. Rev., 72, 399(1947)[4] H. Daniel et. al., Phys. Rev. A, 59, 3343(1999)[5] V. G. Zinov et. al., Sov. J. Nucl. Phys., 2, 613 (1966) [6] H. Matsue et. al., the 53rd Symposium on Radiochemistry, 3A01

Front side Back side (HV-side)

DetectorDetector holder

Connector(25 pin)

Connector(25 pin)

PCB

Detector(Pixel structure)

See questions (part 1) !

Krings, 21.02.2010

Detector unit:

Please note: This detector unit (detector holder, PCBs, mounted and tested detector) is subject of the purchase order!

γγγγ

Krings, 21.02.2010

γγγγ

Detector is irradiated from the front side (structured contact).

Detector is irradiated from the back side (not structured contact) through the cold plate.

Cryostat cap

Version 1 with closed cryostat cap:

河村_ASR2009_ninomiya.pdf河村_SEMIKON