What question did this study set out to answer?

To investigate positron trapping behavior and the formation of positronium-like states within helium bubbles in aluminum exposed to high-energy proton irradiation.

June 1, 1988Journal of Physics F Metal PhysicsOpen Access

Positronium-like positron states in He bubbles in 600 MeV proton-irradiated Al

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Authors

KJK O JensenUniversity of Essex MEM. EldrupTechnical University of Denmark BSB.N. SinghRoskilde University

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Implication

Spectroscopic study reveals positronium-like states at helium bubble surfaces in proton-irradiated aluminum, suggesting impurity atoms influence defect interactions.

Key Points

To investigate positron trapping behavior and the formation of positronium-like states within helium bubbles in aluminum exposed to high-energy proton irradiation.
Irradiated aluminum samples with 600 MeV protons at temperatures between 655 and 728 K to produce helium bubbles.
Performed positron annihilation lifetime spectroscopy and angular correlation measurements across a temperature range of 10 to 300 K.
Identified a narrow angular correlation component (full width at half maximum ~1.6 mrad) paired with a lifetime component of 450–480 ps, indicating a positronium-like state bound to the bubble surface rather than free positronium in the void interior.
Found that approximately half of the positrons trapped in helium bubbles contribute to the narrow angular correlation component, likely reflecting anisotropic electron-positron momentum distributions relative to the bubble boundary.
Attributed the emergence of surface-bound positronium-like states to the segregation of impurity atoms, tentatively identified as sodium, along the bubble interfaces.

Cite This Study

Jensen et al. (1988) studied this question.

synapsesocial.com/papers/6a8a84246fc170cbc2fbf660 https://doi.org/10.1088/0305-4608/18/6/013

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Implication

Spectroscopic study reveals positronium-like states at helium bubble surfaces in proton-irradiated aluminum, suggesting impurity atoms influence defect interactions.

Positronium-like positron states in He bubbles in 600 MeV proton-irradiated Al

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Implication

Key Points

Cite This Study

Positronium-like positron states in He bubbles in 600 MeV proton-irradiated Al

Discussion

Member takes

Implication

Key Points

Cite This Study

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