Use of a newly developed compact 2D-ACAR spectrometer for the study of positronium in solids

T. Hyodo; Y. Nagai; H. Saito; Y. Nagashima; A. Vértes; K. Süvegh

doi:10.4028/www.scientific.net/msf.255-257.488

Use of a newly developed compact 2D-ACAR spectrometer for the study of positronium in solids

T. Hyodo, Y. Nagai, H. Saito, Y. Nagashima, A. Vértes, K. Süvegh

IMR - Materials Design Division

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

A new 2D-ACAR apparatus has been developed. A pair of compact position-sensitive γ-ray detectors are used, each of which consist of 2.2 × 2.2 × 15 mm³ BGO scintillator blocks bunched into a 25 × 21 array with 2.4 mm pich, and coupled to a position-sensitive photomultiplier tube. The new apparatus has been applied to study the wave functions of the delocalized positronium(Ps) in alkali halides and the localized Ps in complex salt [Zn(ptz)₆](BF₄)₂. It has been observed that all the Bloch Ps satellite peaks in KCl and KI, except for the [200] peaks, are extremely weak. The anisotropies of the Ps wave function in [Zn(ptz)₆](BF₄)₂ changes near the temperature where the Fe analogue of the complex salt exibits spin-crossover transition.

Original language	English
Pages (from-to)	488-490
Number of pages	3
Journal	Materials Science Forum
Volume	255-257
DOIs	https://doi.org/10.4028/www.scientific.net/msf.255-257.488
Publication status	Published - 1997

Keywords

2D-ACAR
Alkali Halide
Complex Salt
KCI
KI
Position Sensitive Detector
Positronium
Spin-Crossover
[Fe(ptz)](BF)
[zn(ptz)](BF)

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title = "Use of a newly developed compact 2D-ACAR spectrometer for the study of positronium in solids",

abstract = "A new 2D-ACAR apparatus has been developed. A pair of compact position-sensitive γ-ray detectors are used, each of which consist of 2.2 × 2.2 × 15 mm3 BGO scintillator blocks bunched into a 25 × 21 array with 2.4 mm pich, and coupled to a position-sensitive photomultiplier tube. The new apparatus has been applied to study the wave functions of the delocalized positronium(Ps) in alkali halides and the localized Ps in complex salt [Zn(ptz)6](BF4)2. It has been observed that all the Bloch Ps satellite peaks in KCl and KI, except for the [200] peaks, are extremely weak. The anisotropies of the Ps wave function in [Zn(ptz)6](BF4)2 changes near the temperature where the Fe analogue of the complex salt exibits spin-crossover transition.",

keywords = "2D-ACAR, Alkali Halide, Complex Salt, KCI, KI, Position Sensitive Detector, Positronium, Spin-Crossover, [Fe(ptz)](BF), [zn(ptz)](BF)",

author = "T. Hyodo and Y. Nagai and H. Saito and Y. Nagashima and A. V{\'e}rtes and K. S{\"u}vegh",

year = "1997",

doi = "10.4028/www.scientific.net/msf.255-257.488",

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T1 - Use of a newly developed compact 2D-ACAR spectrometer for the study of positronium in solids

AU - Hyodo, T.

AU - Nagai, Y.

AU - Saito, H.

AU - Nagashima, Y.

AU - Vértes, A.

AU - Süvegh, K.

PY - 1997

Y1 - 1997

N2 - A new 2D-ACAR apparatus has been developed. A pair of compact position-sensitive γ-ray detectors are used, each of which consist of 2.2 × 2.2 × 15 mm3 BGO scintillator blocks bunched into a 25 × 21 array with 2.4 mm pich, and coupled to a position-sensitive photomultiplier tube. The new apparatus has been applied to study the wave functions of the delocalized positronium(Ps) in alkali halides and the localized Ps in complex salt [Zn(ptz)6](BF4)2. It has been observed that all the Bloch Ps satellite peaks in KCl and KI, except for the [200] peaks, are extremely weak. The anisotropies of the Ps wave function in [Zn(ptz)6](BF4)2 changes near the temperature where the Fe analogue of the complex salt exibits spin-crossover transition.

AB - A new 2D-ACAR apparatus has been developed. A pair of compact position-sensitive γ-ray detectors are used, each of which consist of 2.2 × 2.2 × 15 mm3 BGO scintillator blocks bunched into a 25 × 21 array with 2.4 mm pich, and coupled to a position-sensitive photomultiplier tube. The new apparatus has been applied to study the wave functions of the delocalized positronium(Ps) in alkali halides and the localized Ps in complex salt [Zn(ptz)6](BF4)2. It has been observed that all the Bloch Ps satellite peaks in KCl and KI, except for the [200] peaks, are extremely weak. The anisotropies of the Ps wave function in [Zn(ptz)6](BF4)2 changes near the temperature where the Fe analogue of the complex salt exibits spin-crossover transition.

KW - 2D-ACAR

KW - Alkali Halide

KW - Complex Salt

KW - KCI

KW - KI

KW - Position Sensitive Detector

KW - Positronium

KW - Spin-Crossover

KW - [Fe(ptz)](BF)

KW - [zn(ptz)](BF)

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AN - SCOPUS:0031372741

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SP - 488

EP - 490

JO - Materials Science Forum

JF - Materials Science Forum

ER -

Use of a newly developed compact 2D-ACAR spectrometer for the study of positronium in solids

Abstract

Keywords

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