Collisional effects on the HFS transitions of antiprotonic helium

Korenman, G. Ya.; Yudin, S. N.

doi:10.1007/s10751-009-0026-5

Cited by 8 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The density dependence is found to be much smaller for the M1 transitions, the electron spin flip transitions induced by the microwave, than for the E1 transitions induced through laser stimulation [8] . For

theoretical calculations of Grigory Korenman [22,23] confirmed that the density dependence is very small. Also for

theory predicts a collisional shift much smaller than our error bars [13] .…”

Section: Resultsmentioning

confidence: 94%

First observation of two hyperfine transitions in antiprotonic 3He

Friedreich¹,

Barna²,

Caspers³

et al. 2011

Physics Letters B

View full text Add to dashboard Cite

We report on the first experimental results for microwave spectroscopy of the hyperfine structure of normalp¯3He+. Due to the helium nuclear spin, normalp¯3He+ has a more complex hyperfine structure than normalp¯4He+, which has already been studied before. Thus a comparison between theoretical calculations and the experimental results will provide a more stringent test of the three-body quantum electrodynamics (QED) theory. Two out of four super-super-hyperfine (SSHF) transition lines of the false(n,Lfalse)=false(36,34false) state were observed. The measured frequencies of the individual transitions are 11.12559(14) GHz and 11.15839(18) GHz, less than 1 MHz higher than the current theoretical values, but still within their estimated errors. Although the experimental uncertainty for the difference of these frequencies is still very large as compared to that of theory, its measured value agrees with theoretical calculations. This difference is crucial to be determined because it is proportional to the magnetic moment of the antiproton.

show abstract

theoretical calculations of Grigory Korenman [22,23] confirmed that the density dependence is very small. Also for

theory predicts a collisional shift much smaller than our error bars [13] .…”

Section: Resultsmentioning

confidence: 94%

First observation of two hyperfine transitions in antiprotonic 3He

Friedreich¹,

Barna²,

Caspers³

et al. 2011

Physics Letters B

View full text Add to dashboard Cite

show abstract

“…Due to limited measurement time, only one target density was used. However, previous studies in p 4 He + [5] as well as calculations suggest that the target density should have no effect on the resonance line shape, width or amplitude of the resonance lines [15][16][17][18] at the level of the precision of this experiment.…”

Section: Resultsmentioning

confidence: 61%

“…The density dependence is found to be much smaller for an M1 transition, the electron spin-flip transitions induced by the microwave, than for an E1 transition induced through laser stimulation [29]. In the case of p 4 He + theoretical calculations of G. Korenman [15,16] confirmed that the density dependence is very small. Also for p 3 He + theory predicts a collisional shift at the kHz level, much smaller than the experimental error bars [17].…”

mentioning

confidence: 89%

“…The ratio I(t 2 )/I(t 1 ) is largely independent of intensity and position fluctuations of the antiproton beam. The intensity of the transition lines is subject to the time delay between the two laser pulses and thus also to collisional relaxation processes [15][16][17][18]. This means that, once the first laser has caused depopulation, the system will start to relax through spin exchanging collisions T denotes the delay time between the two laser pulses.…”

Section: Laser-microwave-laser Spectroscopymentioning

confidence: 99%

See 1 more Smart Citation

Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3

Friedreich,

Barna,

Caspers

et al. 2013

Preprint

View full text Add to dashboard Cite

In this work we describe the latest results for the measurements of the hyperfine structure of antiprotonic 3 He. Two out of four measurable super-superhyperfine SSHF transition lines of the (n, L) = (36, 34) state of antiprotonic 3 He were observed. The measured frequencies of the individual transitions are 11.12548(08) GHz and 11.15793(13) GHz, with an increased precision of about 43% and 25% respectively compared to our first measurements with antiprotonic 3 He [S. Friedreich et al., Phys. Lett. B 700 (2011) 1-6]. They are less than 0.5 MHz higher with respect to the most recent theoretical values, still within their estimated errors. Although the experimental uncertainty for the difference of 0.03245(15) GHz between these frequencies is large as compared to that of theory, its measured value also agrees with theoretical calculations. The rates for collisions between antiprotonic helium and helium atoms have been assessed through comparison with simulations, resulting in an elastic collision rate of γ e = 3.41 ± 0.62 MHz and an inelastic collision rate of γ i = 0.51 ± 0.07 MHz.

show abstract

“…The ratio I(t 2 )/I(t 1 ) is largely independent of intensity and position fluctuations of the antiproton beam. The intensity of the transition lines is subject to the time delay between the two laser pulses and thus also to collisional relaxation processes [15][16][17][18]. This means that, once the first laser has caused depopulation, the system will start to relax through spin exchanging collisions between antiprotonic helium atoms and regular helium atoms.…”

Section: Laser-microwave-laser Spectroscopymentioning

confidence: 99%

Microwave spectroscopic study of the hyperfine structure of antiprotonic³He

Friedreich

Barna

Caspers

et al. 2013

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

In this work, we describe the latest results for the measurements of the hyperfine structure of antiprotonic 3He. Two out of four measurable super–super-hyperfine (SSHF) transition lines of the (n, L) = (36, 34) state of antiprotonic 3He were observed. The measured frequencies of the individual transitions are 11.125 48(08) GHz and 11.157 93(13) GHz, with the increased precisions of about 43% and 25%, respectively, compared to our first measurements with antiprotonic 3He (Friedreich et al 2011 Phys. Lett. B 700 1–6). They are less than 0.5 MHz higher with respect to the most recent theoretical values, still within their estimated errors. Although the experimental uncertainty for the difference of 0.032 45(15) GHz between these frequencies is large as compared to that of theory, its measured value also agrees with theoretical calculations. The rates for collisions between antiprotonic helium and helium atoms have been assessed through comparison with simulations, resulting in an elastic collision rate of γe = 3.41 ± 0.62 MHz and an inelastic collision rate of γi = 0.51 ± 0.07 MHz.

show abstract

Collisional effects on the HFS transitions of antiprotonic helium

Cited by 8 publications

References 13 publications

First observation of two hyperfine transitions in antiprotonic 3He

First observation of two hyperfine transitions in antiprotonic 3He

Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3

Microwave spectroscopic study of the hyperfine structure of antiprotonic³He

Contact Info

Product

Resources

About

Collisional effects on the HFS transitions of antiprotonic helium

Cited by 8 publications

References 13 publications

First observation of two hyperfine transitions in antiprotonic 3He

First observation of two hyperfine transitions in antiprotonic 3He

Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3

Microwave spectroscopic study of the hyperfine structure of antiprotonic3He

Contact Info

Product

Resources

About

Microwave spectroscopic study of the hyperfine structure of antiprotonic³He