Nuclear polarization in hydrogenlike heavy ions

Yamanaka, Nobuhiro; Haga, Akihiro; Horikawa, Yoko; Ichimura, Atsushi

doi:10.1103/physreva.63.062502

Cited by 12 publications

(22 citation statements)

References 24 publications

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“…For quantitative comparison, we have calculated the muonic NP correction for 16 O in the collective model [21,28], in which the excitation modes are assumed to be concentrated in a single resonant state for each spin and isospin with excitation energies given by …”

Section: Resultsmentioning

confidence: 99%

“…It is extremely important to carry out a similar analysis for electronic NP correction in heavy atoms, where it is expected that the effect of antinucleon states is more remarkable in order to obtain the gauge-invariant result [3,28]. The investigation of the antinucleon contribution to the NP corrections in electronic ground and excited states as well as muonic states may provide an evidence of the strong attractive selfenergy of antinucleon in the nucleus.…”

Section: Resultsmentioning

confidence: 99%

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Relativistic random-phase approximation calculation with negative energy states of nuclear polarization in muonic atoms

et al. 2004

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We study the muonic nuclear-polarization corrections, which provide level shifts due to the two-photon exchange process between a bound muon and a nucleus. We choose 16 O as a nucleus for the demonstration of the amount and the property of the nuclear polarization in the muonic atoms. The nuclear states of 16 O are constructed in the random-phase approximation including the negative-energy states based on the relativistic mean field model. The spatial components of the transition current have large couplings between positive-and negative-energy states. As a result, the contribution from the negative-energy states of nucleus to the nuclearpolarization correction is found to be significant and also essential to achieve gauge invariance. The nuclearpolarization effect in muonic 16 O is also calculated using the collective model. We find that the nonrelativistic nuclear model with the effective mass provides similar results as the relativistic one.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Relativistic random-phase approximation calculation with negative energy states of nuclear polarization in muonic atoms

et al. 2004

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“…By averaging the results measured at four target pressures, a value ν − HF − ν + HF = 27.825(33) MHz was obtained [18,247]. By comparing this with the results of three-body QED calculations [248,249,250,251,252], the magnetic moment was obtained as µ p = −2.7862(83)µ nucl . This determination with a precision of 0.3% is in good agreement with the value measured by X-ray spectroscopy of pPb atoms to a similar precision.…”

Section: Laser-microwave-laser Triple Resonance Spectroscopymentioning

confidence: 91%

Physics at CERN’s Antiproton Decelerator

Hori

Walz

2013

Progress in Particle and Nuclear Physics

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The Antiproton Decelerator (AD) facility of CERN began operation in 1999 to serve experiments for studies of CP T invariance by precision laser and microwave spectroscopy of antihydrogen (H) and antiprotonic helium (pHe + ) atoms. The first 12 years of AD operation saw cold H synthesized by overlapping clouds of positrons (e + ) and antiprotons (p) confined in magnetic Penning traps. Cold H was also produced in collisions between Rydberg positronium (P s) atoms and p. Ground-state H was later trapped for up to ∼ 1000 s in a magnetic bottle trap, and microwave transitions excited between its hyperfine levels. In the pHe + atom, deep ultraviolet transitions were measured to a fractional precision of (2.3-5) × 10 −9 by sub-Doppler two-photon laser spectroscopy. From this the antiproton-to-electron mass ratio was determined as M p /m e =1836.1526736(23), which agrees with the p value known to a similar precision. Microwave spectroscopy of pHe + yielded a measurement of the p magnetic moment with a precision of 0.3%. More recently, the magnetic moment of a single p confined in a Penning trap was measured with a higher precision, as µ p = −2.792845(12)µ nucl in nuclear magnetons. Other results reviewed here include the first measurements of the energy loss (−dE/dx) of 1-100 keV p traversing conductor and insulator targets; the cross sections of low-energy (< 10 keV) p ionizing atomic and molecular gas targets; and the cross sections of 5-MeV p annihilating on various target foils via nuclear collisions. The biological effectiveness of p beams destroying cancer cells was measured as a possible method for radiological therapy. New experiments under preparation attempt to measure the gravitational acceleration of H or synthesize H + . Several other future experiments will also be briefly described.

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“…The HF splitting ( Fig. 1) of pHe + has been calculated by Korobov and Bakalov [14][15][16][17] to the α 4 order. The dominant HF splitting is caused by the interaction of the antiproton orbital angular momentum L with the electron spin Se (p -e − spin-orbit splitting).…”

Section: Antiprotonic Helium Hyperfine Structurementioning

confidence: 99%

Preliminary results from recent measurements of the antiprotonic helium hyperfine structure

Pask

2009

Hyperfine Interact

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We report on preliminary results from a systematic study of the hyperfine (HF) structure of antiprotonic helium. This precise measurement which was commenced in 2006, has now been completed. Our initial analysis shows no apparent density or power dependence and therefore the results can be averaged. The statistical error of the individual lines is a factor of 60 smaller than that of three body quantum electrodynamic (QED) calculations, while the difference has been resolved to a precision comparable to theory (a factor of 10 better than our first measurement). Agreement between theory and experiment would lead to an increased precision of the measurement for the antiproton magnetic moment and provide a test of CPT invariance.

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Nuclear polarization in hydrogenlike heavy ions

Cited by 12 publications

References 24 publications

Relativistic random-phase approximation calculation with negative energy states of nuclear polarization in muonic atoms

Relativistic random-phase approximation calculation with negative energy states of nuclear polarization in muonic atoms

Physics at CERN’s Antiproton Decelerator

Preliminary results from recent measurements of the antiprotonic helium hyperfine structure

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