Recent advances in the comparison of matter- and antimatter-atom collisions

Schultz, David; Olson, R. E.; Reinhold, C. O.

doi:10.1088/0953-4075/24/3/011

Cited by 62 publications

(33 citation statements)

References 227 publications

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“…Table II lists The effective charge Z,g(Ro) that the particle X "sees" at a distance R Rp from Hez+ is determined from the force exerted on X, or by differentiating Eq. (19), as…”

Section: Electronic Levels and Dipole Momentsmentioning

confidence: 99%

“…The work to be reported in this paper is expected to add to the present understanding some new insight into the physics of exotic atoms, especially antiprotonic atoms, which have become the subject of more and more intense research recently [18,19], partly because of the developments in the low-energy antiproton ring (LEAR) at CERN and partly because of the thrust to produce antimatter.…”

Section: Introductionmentioning

confidence: 99%

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Moleculelike metastable states of antiprotonic and mesic helium

Shimamura

1992

Phys. Rev. A

133

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The exotic helium atom, consisting of a helium nucleus He +, an electron e, and a massive, negatively charged particle X, such as an antiproton (p) or a kaon (K ), is studied theoretically. This exotic atom is more like a polar molecule with two nuclei He + and X, if e is in a lowlying orbital and X is in a highly excited orbital. Such states are generally formed in the capture of X by helium. The Born-Oppenheimer (BO) separation of the e motion and the He +-X motion is a good approximation for these states, and affords a transparent, unified perspective of exotic helium with di6'erent X and different isotopes of He +. A propensity rule that favors small transition energies (except for the smallest one) is found for radiative emission by low vibrational, high rotational levels. This rule resembles the selection rule for infrared emission by the usual diatomic polar molecules, and contradicts the conventional expectation that radiative transitions in exotic atoms favor larger transition energies. The radiative lifetimes~of highly excited states formed immediately after the capture of X are of the order of @sec for He +-p-e and He +-"t . , and those for He +-K -e are about half the values for the antiprotonic helium. The efFect of the electronic charge polarization by X on~is explained quantitatively in a simple picture in terms of the molecular dipole moment. Low vibrational, high rotational states are described as circular or near-circular states in the atomic picture. They are stable against Auger decay, which the nonadiabatic perturbation on the BO states induces. An infinite series of bound E electronic states of exotic helium negative ions (He +-X -e )-c exists for any He +-X distances R beyond 0.819 a.u. in the BO approximation. An infinite II series exists for R & 3.811 a.u. , and an infinite 6 series for R )9. 532 a.u.

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“…Table II lists The effective charge Z,g(Ro) that the particle X "sees" at a distance R Rp from Hez+ is determined from the force exerted on X, or by differentiating Eq. (19), as…”

Section: Electronic Levels and Dipole Momentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Moleculelike metastable states of antiprotonic and mesic helium

Shimamura

1992

Phys. Rev. A

133

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“…More recently, the term has come to refer to the differences in electromagnetic interaction between a particle of matter and its environment as compared with its antimatter equivalent [25]. It is generally true that negatively-charged particles have lower stopping powers in matter than their positively-charged equivalents.…”

Section: The Barkas Effectmentioning

confidence: 99%

Current status of the saddle-point model

Gay¹

1996

AIP Conference Proceedings

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“…During the delay time the ions with velocity v fly a distance Ds = t v. Thus, the above expansion can be rewritten as t = t 0 C 0 v C 1 tv/s C 2 (tv/s) 2 …. The magnitudes of the delay time and acceleration fields in a Wiley-McLaren (WM) TOF system are chosen to eliminate the second and the third terms in the above expansion for a given ion mass and for the total acceleration potential, U 0 .…”

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confidence: 99%

A novel scheme for the time-of-flight analysis of extended ion packets

Moskovets

Vertes

1999

Rapid Commun. Mass Spectrom.

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A new scheme is proposed for providing enhanced time-of-flight focusing of spatially extended ion packets moving with close to uniform velocity, sufficiently high for reliable ion detection. The arrangement consists of two decelerating regions with homogeneous electric fields similar to the two-stage ion reflector. The decelerating field in the first decelerating stage is created in a pulsed fashion after the ion packet has entered the first region. The effect of fringe fields produced by shielding rings and the microchannel plate detector is discussed. Copyright 1999 John Wiley & Sons, Ltd.

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Recent advances in the comparison of matter- and antimatter-atom collisions

Cited by 62 publications

References 227 publications

Moleculelike metastable states of antiprotonic and mesic helium

Moleculelike metastable states of antiprotonic and mesic helium

Current status of the saddle-point model

A novel scheme for the time-of-flight analysis of extended ion packets

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