Degree of ionization in antiprotonic noble gases

Bacher, R.; Blüm, P.; Gotta, D.; Heitlinger, K.; Schneider, M.; Missimer, John; Simons, L. M.; Elsener, K.

doi:10.1103/physreva.38.4395

Cited by 47 publications

(35 citation statements)

References 40 publications

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“…These electrons may be refilled from the outside in the case of metals or even insulators (the sometimes highly charged exotic atom strongly attracts electrons from the surroundings), but in low-pressure noble gases this supply is far too slow to prevent complete depletion by the continuous loss of electrons (Bacher et al, 1988). Completely stripped antiprotonic atoms constitute ideal traps for the p , albeit for a very short time.…”

Section: The Antiprotonic-atom Cascadementioning

confidence: 99%

Forty years of antiprotons

Eades

Hartmann

1999

Rev. Mod. Phys.

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The discovery of the antiproton some 40 years ago and the almost synchronous fall of parity (P) and charge conjugation (C) symmetries were soon followed by the realization that CPT rather than C invariance is the fundamental symmetry connecting matter and antimatter, and that consequently any measurement of the antiproton's properties can be interpreted as a test of that symmetry. It is the latter view of the antiproton, as an object of study in its own right, rather than as a means to such other ends as the production of gauge bosons and meson resonances, that is presented here. The authors review the technical steps that have led from the handful of antiprotons observed by Chamberlain, Segrè , Wiegand, and Ypsilantis to the intense, high-quality beams available today and show how the state of rest and isolation required for high precision measurements of their properties can be achieved by confining them in electromagnetic traps or in their microscopic counterparts, exotic atoms. The test bench role of antiprotons and antihydrogen atoms for both CPT symmetry and the gravitational weak equivalence principle is discussed, and the body of experimental results obtained since 1955 critically reviewed from this standpoint. Future experiments are then discussed in the light of the closure of the CERN Low Energy Antiproton Ring (LEAR), its replacement in 1999 by the Antiproton Decelerator (AD), and the likely antiproton source at the Japan Hadron Facility.[S0034-6861(99)00401-8] CONTENTS

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Section: The Antiprotonic-atom Cascadementioning

confidence: 99%

Forty years of antiprotons

Eades

Hartmann

1999

Rev. Mod. Phys.

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“…The yield of ladder transitions (n º 7) was measured to be D50% for relatively low pressure (D10~2 atm) gases forming antiprotonic atoms (Bacher et al 1988). On the other hand, Lyman lines were measured at high gas pressures (¹170 atm) for muonic atoms (Jacot-Guillarmod et al 1988).…”

Section: Y Ield Of L Adder T Ransitionsmentioning

confidence: 99%

“…The deÐnitive experiments were done in noble gases by Bacher et al (1988). A detailed understanding of the relevant atomic physics is necessary to apply these results to the optimization of GAPS.…”

Section: Antiheliummentioning

confidence: 99%

A Novel Antimatter Detector Based on X‐Ray Deexcitation of Exotic Atoms

Mori

Hailey

Baltz

et al. 2002

ApJ

102

156

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We propose a novel antiparticle detector. The gaseous antiparticle spectrometer (GAPS) e †ects particle identiÐcation through the characteristic X-rays emitted by antiparticles when they form exotic atoms in gases. GAPS obtains particularly high grasp (e †ective areaÈsolid angle product) at lower particle energies, where conventional schemes are most limited in their utility. The concept is simple and lightweight, so it can be readily employed on balloon-and space-based missions. An extremely powerful potential application of GAPS is a space-based search for the neutralino through the detection of a neutralino annihilation by-productÈthe antideuteron. Paradoxically, this space-based search for the neutralino is capable of achieving comparable sensitivity to as yet unrealized third-generation, underground dark matter experiments. And GAPS can obtain this performance in a very modest satellite experiment. GAPS can also provide superior performance in searches for primary antiprotons produced via neutralino annihilation and black hole evaporation and in probing subdominant contributions to the antiproton Ñux at low energies. In a deep space mission, GAPS will obtain higher sensitivity for a given weight and power than BGO calorimeters.

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“…Among the many interesting results I mention only two. The first is the demonstration of com plete removal of electrons from the heavy noble gases Ne, Ar, and Kr by the captured antiproton, with similar but less well established results in Xe [2]. The stripping proceeds in onion peeling fashion, electron shells being succes sively discarded as the antiproton cas cades towards its ground state.…”

Section: Regionmentioning

confidence: 99%

“…With these new and old tools, nume rous adventurous experiments in all four energy regions are under preparation or discussion [see Hyperfine Interactions 44 (1989) [1][2][3][4]. The interaction of ioni sing radiation with matter is the basis of most high energy physics techniques, and a general study of antiproton ioni sation phenomena in region 1 including extended measurements on multiple ionisation will be of immense value.…”

Section: Future Experiments Regionmentioning

confidence: 99%

Antiproton Physics Beyond the Low-Energy Frontier

Eades¹

1990

Europhys. News

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Degree of ionization in antiprotonic noble gases

Cited by 47 publications

References 40 publications

Forty years of antiprotons

Forty years of antiprotons

A Novel Antimatter Detector Based on X‐Ray Deexcitation of Exotic Atoms

Antiproton Physics Beyond the Low-Energy Frontier

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