Study on laser cooling of ortho-positronium

Kumita, T.; Hirose, T.; Irako, Mitsuhiro; Kadoya, K.; Matsumoto, B.; Wada, Kazuyuki; Mondal, Nagendra Nath; Yabu, Hiroyuki; Kobayashi, Kurima; Kajita, Masatoshi

doi:10.1016/s0168-583x(02)00863-7

Cited by 22 publications

(19 citation statements)

References 6 publications

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“…Ps laser cooling has been discussed for many years [73,361,384,[670][671][672] but has not been experimentally demonstrated, even in a proof-of-principle measurement. The atomic structure of Ps does not present any fundamental limitations to Ps cooling, but annihilation of ground states is a significant limitation insofar as it limits the total amount of cooling that can be obtained using the 1 3 S 1 -2 3 P J transition, which is the most efficient in terms of the energy removed from the system per cooling cycle.…”

Section: Bose-einstein Condensationmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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Abstract. The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps. Large numbers of positrons (typically ≥10 6 ) accumulated in such a device may be ejected all at once, so as to generate an intense pulse. Standard bunching techniques can produce pulses with ns (mm) temporal (spatial) beam profiles. These pulses can be converted into a dilute Ps gas in vacuum with densities on the order of 10 7 cm −3 which can be probed by standard ns pulsed laser systems. This allows for the efficient production of excited Ps states, including long-lived Rydberg states, which in turn facilitates numerous experimental programs, such as precision optical and microwave spectroscopy of Ps, the application of Stark deceleration methods to guide, decelerate and focus Rydberg Ps beams, and studies of the interactions of such beams with other atomic and molecular species. These methods are also applicable to antihydrogen production and spectroscopic studies of energy levels and resonances in positronium ions and molecules. A summary of recent progress in this area will be given, with the objective of providing an overview of the field as it currently exists, and a brief discussion of some future directions.

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Section: Bose-einstein Condensationmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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“…It is difficult to obtain low-energy positrons in large numbers; hence Ps 2 has not previously been observed [16,17]. In order to make more intense slow positron beam, e + trapping systems Khaneko trap after the name of J. Khaneko, a graduate student of our laboratory in TMU [13] and e + bottle commonly known as Surko trap after the name of Clifford M. Surko at the UCSD (University of California, San Diego), USA [18], were developed respectively. Intense e + bursts are implanted into a thin film of porous silica, Ps 2 is created on the internal pore surfaces at the UCR.…”

Section: Resultsmentioning

confidence: 99%

Does the Fifth State of Matter Originate the Early Universe?

Mondal¹

2015

JPSA

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Abstract:In this article we have demonstrated BEC (Bose-Einstein Condensate) which is the fifth state of matter. Recent development of gamma-ray laser and scenario of black holes are highlighted. From the Stephen W. Hawking's lecture at KTH, Stockholm and the experimental evidence of LIGO scientific collaboration, USA, it is found that binary type black holes exist and can emit information which is detectable. Hence the source of information of black holes is not relay black; constituents are the densest state of material considered to be the fifth state and the primordial state of the Universe.

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“…For this purpose, a Doppler laser cooling of o-Ps has been studied on the transition 1 3 S ↔ 2 3 P. This cooling process has been first studied by [23], and led to non conclusive experimental trials [24,25]. A recent publication [26] proposes a new method to cool Ps in order to reach a BEC.…”

Section: A Possible Laser Doppler Cooling Of Ps ?mentioning

confidence: 99%

Overview of Recent Work on Laser Excitation of Positronium for the Formation of Antihydrogen

Yzombard

Strojek

Evans

et al. 2017

Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016)

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The AEgIS experiment carried out at CERN aims to form a cold antihydrogen beam to perform precision studies on gravity. A key ingredient is the creation of antihydrogen via a charge-exchange process between trapped antiprotons and Rydberg excited positronium atoms (Ps). In the present, the latest results of laser excitation of Ps are reviewed, as well as studies on a possible laser manipulation and cooling of Ps and antiprotons.

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Study on laser cooling of ortho-positronium

Cited by 22 publications

References 6 publications

Experimental progress in positronium laser physics

Experimental progress in positronium laser physics

Does the Fifth State of Matter Originate the Early Universe?

Overview of Recent Work on Laser Excitation of Positronium for the Formation of Antihydrogen

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