Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session Q01: New Physics with Positrons and Positronium
8:00 AM–10:00 AM,
Thursday, June 3, 2021
Chair: Ilya Fabrikant, U. Nebraska - Lincoln
Abstract: Q01.00003 : Progress in the study of the positronium negative ion*
9:00 AM–9:30 AM
Live
Presenter:
YASUYUKI NAGASHIMA
(Department of Physics, Tokyo University of Science)
Author:
YASUYUKI NAGASHIMA
(Department of Physics, Tokyo University of Science)
Ps can also bind to another electron weakly to form a positronium negative ion (Ps-). It is one of a series of exotic systems composed of three particles with equal masses and bound through Coulomb interaction, and is the only one produced experimentally so far.
The existence of Ps- was theoretically discussed by Wheeler [1] in 1946 and first produced by Mills [2] in 1981 using the beam-foil method. Its production efficiency was low and researches on Ps- were limited to the measurement of its decay rate. However, in 2008, the production efficiency was improved by double digits by using an alkali metal coated tungsten surface [3] and we are entering a new era of Ps- research.
In this presentation, I will talk recent experimental developments concerning Ps- including:
(i) photodetachment of Ps- [4],
(ii) studies of shape resonance of Ps- [5],
(iii) determination of the Ps- binding energy [6],
(iv) production of an energy-tunable Ps beam via photodetachment of accelerated Ps- [7], and
(v) resonant coherent excitation of Ps [8] studied using the energy-tunable Ps beam.
In addition to the efficient Ps- production technology, these studies use notable technologies in this field, such as linac-based pulsed slow positron beam [9] and a buffer gas positron trap (Surko-trap) [10].
*This work was supported by JSPS KAKENHI Grant Numbers 24221006 and 17H01074. It was also supported by MATSUO FOUNDATION, Japan.
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