Measurement of kaonic and pionic X-rays from liquid helium

Batty, C.J.; Biagi, S.; Hoath, S.D.; Sharman, P W; Davies, John Dwyfor; Pyle, G.J.; Squier, G.T.A.

doi:10.1016/0375-9474(79)90403-2

Cited by 68 publications

(31 citation statements)

References 6 publications

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“…This shift is consistent with the theoretically calculated values by both the optical potential models [13] (∼ 0 eV) and the model predicting deeply bound kaonic states [14] (∼10 eV). It disagrees with the values from the earlier experiments [9][10][11]. Therefore the long-standing problem in the energy level of the kaonic helium-4 2 p state is solved.…”

Section: Kev] and Timing [∼430 Ns (Fwhm)] About 2000 Events Of The Kmentioning

confidence: 45%

“…It settled the more-than 30 years' long discrepancy between theory and experiments on the strong-interaction shift of the kaonic helium-4 2 p state. A large repulsive shift (about −40 eV) was measured by three experimental groups in the 1970's and 80's [9][10][11], while a very small shift (< 1 eV) was estimated by the optical models calculated from the kaonic atom X-ray data with Z > 2 [13]. This significant disagreement between the experimental results and the theoretical calculations is known as the "kaonic helium puzzle".…”

Section: Kaonic Helium-4 X-ray Measurements At E570mentioning

confidence: 97%

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Silicon drift detectors for exotic atoms

Ishiwatari

2009

Hyperfine Interact

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Section: Kev] and Timing [∼430 Ns (Fwhm)] About 2000 Events Of The Kmentioning

confidence: 45%

Section: Kaonic Helium-4 X-ray Measurements At E570mentioning

confidence: 97%

Silicon drift detectors for exotic atoms

Ishiwatari

2009

Hyperfine Interact

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“…1). For what concerns the kaonic helium-4, the situation till recent years was rather ambiguous; first measurements of the L α lines have been performed by three experiments [1,2,3] more than 20 years ago. Later theoretical predictions [5,6,7], based on a complex density dependent optical potential [8,9], gave, within few σ s, results which were more than an order of magnitude lower with respect to the experimental results, giving rise to the so called "Kaonic helium puzzle".…”

mentioning

confidence: 99%

First K-He3 and precision K-He4 measurement at DAFNE

Scordo¹

2011

Proceedings of XLIX International Winter Meeting on Nuclear Physics — PoS(Bormio 2011)

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The strong interaction, described by the QCD in the framework of the Standard Model, is still hiding many mysteries, especially in the low-energy limit, the so called non-perturbative regime. Kaonic atoms, having a K − replacing an e − orbiting the nucleus, play a special role in this field due to the strange quark contained in the kaon. Of particular interest are the low Z kaonic atoms, like kaonic helium 3 and 4, protagonist of an intense debate both experimentally and theoretically. Kaonic helium-4 was indeed the subject of a "puzzle" between theoretical predictions and experimental data, whose solution could lead to a deeper understanding of some open questions in the field of the low energy QCD. More profound information can be obtained if precise data on kaonic helium-3 are available too. In this work, the first experimental results coming from the SIDDHARTA experiment at DAΦNE, which performed for the first time precision X-ray measurements on kaonic helium-3 atoms in addition to kaonic helium-4, exctracting also the relative yields to the L α line for a gaseous target, are presented. These yields information can contribute in a further understanding of the formation and cascade processes involved in kaonic atoms.

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“…Measurements of kaonic helium 2p X-rays were performed in the 70's and 80's using liquid 4 He targets [1][2][3]. The absolute X-ray yields were about half the values predicted by cascade models [3,4].…”

Section: Introductionmentioning

confidence: 99%

L-series X-ray yields of kaonic 3He and 4He atoms in gaseous targets

et al. 2014

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Abstract. The SIDDHARTA experiment measured X-rays from kaonic helium atoms using, for the first time, gaseous 3 He and 4 He targets. Clear patterns of the L-series X-rays of kaonic 3 He and 4 He atoms were observed. By using accurate Monte Carlo simulations, the absolute yields of these X-ray transitions were determined to be Y (3d → 2p) = 25.0 −9.5 % for 4 He (2.15 g/l). In addition, the yields Y (nd → 2p), with n > 3 were also determined. The measured yields provide valuable information for understanding the cascade processes of kaonic helium atoms as a function of the target density.

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Measurement of kaonic and pionic X-rays from liquid helium

Cited by 68 publications

References 6 publications

Silicon drift detectors for exotic atoms

Silicon drift detectors for exotic atoms

First K-He3 and precision K-He4 measurement at DAFNE

L-series X-ray yields of kaonic 3He and 4He atoms in gaseous targets

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