Erratum: Auger decay rates of antiprotonic helium [Phys. Rev. A<b>61</b>, 062507 (2000)]

Kartavtsev, O. I.; Fedotov, S. I.

doi:10.1103/physreva.63.019901

Cited by 7 publications

(11 citation statements)

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“…Experimental decay rates and theoretically calculated Auger decay rates in Refs. [7,9,11,13] in s −1 . L is the minimum transition multipolarity of Auger decay.…”

Section: Resultsmentioning

confidence: 99%

“…Although an ab initio calculation [13] predicted a large anomaly, its decay rate was found to be nonanomalous. Another calculation [11] was done by introducing continuum-coupled wave functions explicitly in the equation of motion, and resulted in a nonanomalous value. After the present experiment was finished Korobov presented the results of a new calculation with the CCR method [7].…”

Section: Resultsmentioning

confidence: 99%

“…Figure 2 and Table I show the results of our decay rate measurements for all the 18 (including eight already published) states. Theoretical values by Korobov and Shimamura [13], Kartavtsev with co-workers [11], and the latest calculations by Korobov [7] and Kino [9] are also shown.…”

Section: Intermediate Ratesmentioning

confidence: 99%

“…(2), we found two exceptions. One was the ͑n , l͒ = ͑37, 33͒ state, which is possibly affected by an electron-excited configuration ͑32, 31͒ p ͑3d͒ e having a nearby level energy [11]. Another was the (32, 31) state, the decay rate of which our lowdensity measurement with the RFQ decelerator [4,16] revealed to be greatly enhanced by collisions.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the Auger rates ␥ A , which are dominant in the total decay rate for some pHe + states, have been calculated by many theorists [10][11][12][13] over a period of more than 30 years. The latest calculations with complex coordinate rotation (CCR) method by Korobov [7] and Kino [9] yield both real and imaginary parts of the complex energy at the same time, and the both parts are expected to have absolute precisions of the same order.…”

Section: Introductionmentioning

confidence: 99%

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Systematic study of the decay rates of antiprotonic helium states

Yamaguchi

Hayano²,

Ishikawa³

et al. 2004

Phys. Rev. A

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A systematic study of the decay rates of antiprotonic helium (p 4 He + and p 3 He + ) at CERN Antiproton Decelerator has been made by a laser spectroscopic method. The decay rates of some of its short-lived states, namely those for which the Auger rates ␥ A are much larger than their radiative decay rates ͑␥ rad ϳ 1 s −1 ͒, were determined from the time distributions of the antiproton annihilation signals induced by laser beams, and the widths of the atomic resonance lines. The magnitude of the decay rates, especially their relation with the transition multipolarity, is discussed and compared with theoretical calculations.

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“…Experimental decay rates and theoretically calculated Auger decay rates in Refs. [7,9,11,13] in s −1 . L is the minimum transition multipolarity of Auger decay.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Intermediate Ratesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Systematic study of the decay rates of antiprotonic helium states

Yamaguchi

Hayano²,

Ishikawa³

et al. 2004

Phys. Rev. A

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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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Antiprotonic helium andCPTinvariance

Hayano¹,

Hori²,

Horváth³

et al. 2007

Rep. Prog. Phys.

118

140

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We review recent progress in the laser and microwave spectroscopy of antiprotonic helium atoms (pHe + ≡ e − − p − He ++ ) carried out at CERN's Antiproton Decelerator facility (AD). Laser transitions were here induced between Rydberg states (n, ) and (n ± 1, − 1) of pHe + (n ∼ 40 and n − 1 being the principal and orbital angular momentum quantum numbers of the antiproton orbit). Successive refinements in the experimental techniques improved the fractional precision on the pHe + frequencies from 3 parts in 10 6 to ∼1 part in 10 8 . These included a radiofrequency quadrupole decelerator, which reduced the energy of the antiprotons from 5.3 MeV (the energy of the beam emerging from AD) to ∼100 keV. This enabled the production of pHe + in ultra-low density targets, where collisional effects with other helium atoms are negligible. A continuous wave pulse-amplified dye laser, stabilized against a femtosecond optical frequency comb, was then used to measure the pHe + frequencies with ppb-scale precision. This progress in the experimental field was matched by similar advances in computing methods for evaluating the expected transition frequencies in three-body QED calculations. The comparison of experimental (ν exp ) and theoretical (ν th ) frequencies for seven transitions in p4 He + and five in p3 He + yielded an antiproton-to-electron mass ratio of m p/m e = 1836.152 674(5). This agrees with the known proton-to-electron mass ratio at the level of ∼2× 10 −9 . The experiment also set a limit on any CPT-violating difference between the antiproton and proton charges and masses, (Q p − |Q p|)/Q p ∼ (m p − m p)/m p < 2 × 10 −9 to a 90% confidence level. If on the other hand we assume the validity of the CPT invariance, the m p/m e result can be taken to be equal to m p /m e . This can be used as an input to future adjustments of fundamental constants. The hyperfine structure of a state in p4 He + has also been measured by microwave spectroscopy to a precision of 3 × 10 −5 . This corresponds to the accuracy of the most precise three-body QED calculations. Further increases in the experimental precision may soon yield an improvement in the value of the antiproton magnetic moment.

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Erratum: Auger decay rates of antiprotonic helium [Phys. Rev. A61, 062507 (2000)]

Cited by 7 publications

References 0 publications

Systematic study of the decay rates of antiprotonic helium states

Systematic study of the decay rates of antiprotonic helium states

Physics at CERN’s Antiproton Decelerator

Antiprotonic helium andCPTinvariance

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