Delocalized positronium in BaF2

Koji Inoue; Naoki Suzuki; Toshio Hyodo; Yasuyoshi Nagai; Masayuki Hasegawa

doi:10.1143/JPSJ.80.054709

Delocalized positronium in BaF₂

Koji Inoue, Naoki Suzuki, Toshio Hyodo, Yasuyoshi Nagai, Masayuki Hasegawa

IMR - Materials Design Division

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

1 Citation (Scopus)

Abstract

The momentum distribution of positronium (Ps) in BaF₂ single crystal has been investigated in a temperature range from 10 to 297K. The existence of the delocalized and localized Ps has been confirmed. The momentum distribution of the delocalized Ps, a central peak at zero momentum and satellite peaks at the momenta corresponding to the reciprocal lattice vectors, has a large width even at 10K. The width is almost independent of temperature. The behavior is different from that of the delocalized Ps in other ionic crystals. This indicates that the delocalized Ps in BaF₂ is strongly coupled to the phonon field.

Original language	English
Article number	054709
Journal	Journal of the Physical Society of Japan
Volume	80
Issue number	5
DOIs	https://doi.org/10.1143/JPSJ.80.054709
Publication status	Published - 2011 May

Keywords

Angular correlation of positron annihilation radiation
BaF
Delocalized state
Momentum distribution
Positronium

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10.1143/JPSJ.80.054709

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title = "Delocalized positronium in BaF2",

abstract = "The momentum distribution of positronium (Ps) in BaF2 single crystal has been investigated in a temperature range from 10 to 297K. The existence of the delocalized and localized Ps has been confirmed. The momentum distribution of the delocalized Ps, a central peak at zero momentum and satellite peaks at the momenta corresponding to the reciprocal lattice vectors, has a large width even at 10K. The width is almost independent of temperature. The behavior is different from that of the delocalized Ps in other ionic crystals. This indicates that the delocalized Ps in BaF2 is strongly coupled to the phonon field.",

keywords = "Angular correlation of positron annihilation radiation, BaF, Delocalized state, Momentum distribution, Positronium",

author = "Koji Inoue and Naoki Suzuki and Toshio Hyodo and Yasuyoshi Nagai and Masayuki Hasegawa",

year = "2011",

month = may,

doi = "10.1143/JPSJ.80.054709",

language = "English",

volume = "80",

journal = "Journal of the Physical Society of Japan",

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T1 - Delocalized positronium in BaF2

AU - Inoue, Koji

AU - Suzuki, Naoki

AU - Hyodo, Toshio

AU - Nagai, Yasuyoshi

AU - Hasegawa, Masayuki

PY - 2011/5

Y1 - 2011/5

N2 - The momentum distribution of positronium (Ps) in BaF2 single crystal has been investigated in a temperature range from 10 to 297K. The existence of the delocalized and localized Ps has been confirmed. The momentum distribution of the delocalized Ps, a central peak at zero momentum and satellite peaks at the momenta corresponding to the reciprocal lattice vectors, has a large width even at 10K. The width is almost independent of temperature. The behavior is different from that of the delocalized Ps in other ionic crystals. This indicates that the delocalized Ps in BaF2 is strongly coupled to the phonon field.

AB - The momentum distribution of positronium (Ps) in BaF2 single crystal has been investigated in a temperature range from 10 to 297K. The existence of the delocalized and localized Ps has been confirmed. The momentum distribution of the delocalized Ps, a central peak at zero momentum and satellite peaks at the momenta corresponding to the reciprocal lattice vectors, has a large width even at 10K. The width is almost independent of temperature. The behavior is different from that of the delocalized Ps in other ionic crystals. This indicates that the delocalized Ps in BaF2 is strongly coupled to the phonon field.

KW - Angular correlation of positron annihilation radiation

KW - BaF

KW - Delocalized state

KW - Momentum distribution

KW - Positronium

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DO - 10.1143/JPSJ.80.054709

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JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

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ER -

Delocalized positronium in BaF₂

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Keywords

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