Publisher’s Note: Measurement of Cu<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>-Shell and Ag<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>L</mml:mi></mml:math>-Shell Ionization Cross Sections by Low-Energy Positron Impact [Phys. Rev. Lett.<b>92</b>, 223201 (2004)]

Nagashima, Yasuyuki; Saito, Fuminori; Itoh, Yoshiko; Gotō, Akira; Hyodo, Toshio

doi:10.1103/physrevlett.92.239902

Cited by 13 publications

(35 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The single ionization of inner-shell electrons by lepton impact is the fundamental atomic process of particular interest [1,2,3,4,5,6]. In the present paper, which is a further extension of our previous works [7,8], we deduce the universal scaling behavior of differential cross sections for the single K-shell ionization of hydrogen-like multicharged ions by electron or positron impact.…”

Section: Introductionsupporting

confidence: 54%

Doubly differential cross sections for K-shell ionization by electron and positron impact

Михайлов¹,

Nefiodov²,

Plunien³

2010

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

We have investigated the universal scaling behavior of differential cross sections for the single K-shell ionization by electron or positron impact. The study is performed within the framework of non-relativistic perturbation theory, taking into account the one-photon exchange diagrams. In the case of low-energy positron scattering, the doubly differential cross section exhibits prominent interference oscillations. The results obtained are valid for arbitrary atomic targets with moderate values of nuclear charge number Z.

show abstract

Section: Introductionsupporting

confidence: 54%

Doubly differential cross sections for K-shell ionization by electron and positron impact

Михайлов¹,

Nefiodov²,

Plunien³

2010

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

show abstract

“…7, may be observed in the near future. The threshold behavior of the inner shell ionization by positron impact is different from that of electron impact [143]. Recently, the total cross sections for Ps scattering with atoms and molecules are reported to be unexpectedly close to that of a bare electron moving at the same velocity [79].…”

Section: Summary and A Look To The Futurementioning

confidence: 96%

Experiments on positronium negative ions

Nagashima

2014

Physics Reports

Self Cite

View full text Add to dashboard Cite

“…The threshold behavior of the inner shell ionization by positron impact is different from that of electron impact [36]. Recently, the total cross sections for Ps scattering with atoms and molecules are reported to be unexpectedly close to that of a bare electrons moving at the same velocity [32].…”

Section: Production Of An Energy-tunable Positronium Beam Using the Pmentioning

confidence: 98%

The simplest three body system: Positronium negative ions

Nagashima¹,

Michishio

Terabe

2014

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

Positronium formation as a three-body reaction. II. The second-order nuclear amplitudes Positronium formation as a three-body reaction. I. The second-order positron-electron interaction amplitude Abstract. The positron, an anti-particle of the electron, can bind with an electron to form positronium. Another electron can also bind to the positronium weakly to form a positronium negative ion. In this paper, recent progresses in the experimental studies on this ion are reviewed. POSITRONIUMPositronium is a bound state of a positron and an electron. The orbital part of the wave function is the same as that of the hydrogen atom except for the binding energy of the ground state, which is half that of the hydrogen atom because the reduced mass is m e /2, where m e is the rest mass of the electron.The positron and the electron in Ps annihilate into γ-rays. The unique characteristics for the annihilation are mainly due to the spins of the positron and the electron. When the total spin of the positron and the electron is 0 (single state), the number of the emitted γ-rays is 2 and the lifetime of the ground state in vacuum is 125ps. The Ps of this state is called as parapositronium (p-Ps). When the total spin is 1 (triplet state), the number of emitted γ-rays is 3 and the lifetime is 142ns. The Ps of this state is called as orthopositronium (o-Ps).Ps is formed by collisions of positrons with gas molecules. It is also formed in insulators such as amorphous and crystalline SiO 2 [10] and several kinds of alkali halides [11]. Ps is not formed in metals but may be formed on metal surfaces. When low-energy positrons impinge on metal surfaces, they will penetrate into the bulk, lose their energy until thermalized, and some of them diffuse back the surface [12]. The positrons may be trapped in the surface potential well and annihilate there. If the positron work function φ + is negative, the positrons may be emitted with the characteristic energy |φ + |. The positrons may also be emitted as Ps with a maximum energy |φ + + φ − − 6.8eV|. The fraction of the slow positrons yielding Ps from metal surfaces is normally on the order of 10 %. In the case of alkali

show abstract

Publisher’s Note: Measurement of CuK-Shell and AgL-Shell Ionization Cross Sections by Low-Energy Positron Impact [Phys. Rev. Lett.92, 223201 (2004)]

Cited by 13 publications

References 0 publications

Doubly differential cross sections for K-shell ionization by electron and positron impact

Doubly differential cross sections for K-shell ionization by electron and positron impact

Experiments on positronium negative ions

The simplest three body system: Positronium negative ions

Contact Info

Product

Resources

About