Analysis of time-spectra from coincidence measurements with high stop-rates

Hoffmann, R.; Gaukler, G.; Nolte, G.; Schmidt‐Böcking, H.; Schuch, R.

doi:10.1016/0167-5087(82)90333-7

Cited by 24 publications

(4 citation statements)

References 8 publications

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“…For the (e, H + ) time spectra, the background at the right-hand side of the coincidence peak is practically absent, while for the (e, H 0 ) channel a higher background is seen. This is mainly due to the different stop-pulse rates in both channels (comprehensive discussions of TAC spectra have been provided by Coleman and co-workers (1974, 1979), Hoffmann et al (1982 and Schmidt-Böcking et al (1983)). The total counts N a , within a window ranging from the first channel of the time spectra to a channel a closely behind the coincidence peak, include 'lost coincidence' events that were not registered as true coincidences within the peak (Schmidt-Böcking et al 1983).…”

Section: Measurement Proceduresmentioning

confidence: 99%

Coincidence study of electron transfer to the continuum process in collisions at intermediate energies

Focke¹,

Bernardi²,

Fregenal³

et al. 1998

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

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Energy distributions of electrons ejected into the forward direction in 15-214 keV H 0 → Ar collisions were measured in coincidence with charge-state analysed outgoing projectiles. All spectra show a cusp-shaped peak centred at an electron velocity equal to that of the projectile. The peaks observed in coincidence with H + are associated with the electronprojectile Coulomb final-state interaction. On the other hand, the physical origin of the cusp-like structure observed in coincidence with neutral H 0 outgoing projectiles is still unknown. Here we present some new evidence that seems to indicate that this peak can be attributed to the dipole interaction between the emitted electron and an excited state of the outgoing H 0 projectile. The fractions of the cusp yields show that the electron transfer into the continuum process associated with emerging H 0 becomes more important for decreasing projectile energies.

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Section: Measurement Proceduresmentioning

confidence: 99%

Coincidence study of electron transfer to the continuum process in collisions at intermediate energies

Focke¹,

Bernardi²,

Fregenal³

et al. 1998

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

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“…For more details, in particular for a discussion of time-coincidence techniques at high count rates, we refer to reference [32]. For more details, in particular for a discussion of time-coincidence techniques at high count rates, we refer to reference [32].…”

Section: Data Reductionmentioning

confidence: 99%

The impact parameter dependence of the K MO X-ray emission in208Pb +208Pb collisions

et al. 1984

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The emission probabilities for quasimolecular K-x-radiation (K-MOR) have been measured in 2~176 collisions at 4.3 MeV/u and 4.8 MeV/u as a function of the scattering angle using the particle-photon-coincidence technique. The probabilities exhibit a superposition of two exponential slopes with different fall-off constants. We identify the sharp fall off at very small impact parameters (<60fm) with the K-MOR contribution from the decay of l sa-vacancies. The flatter slope for impact parameters larger than 60 fin is attributed to the radiative decay of holes in 2pl/2a molecular states.In this way, experimental "lsa-MOR-emission probabilities" could be extracted and compared with theory. For 4.3MeV/u the ls~-and 2pl/2a-excitation probabilities could also be determined and have been compared to coupled-channel calculations and to a scaling law for lsaexcitation.

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“…The random coincidences are subtracted by determining the size of the time peak in the coincidence time spectrum following [13]. Analyzed coincidences were those with one Xray and one particle in the PPAD, one X-ray and one particle in the MWPC and triple coincidences with one X-ray and one particle in each side of the MWPC.…”

Section: Experiments and Data Reductionmentioning

confidence: 99%

Search for interference structures in the quasimolecular X-ray-andK-vacancy production in close collisions of 462 MeV hydrogen-like Kr ions on Mo solid targets

Wintermeyer

Dangendorf

Schmidt‐Böcking

et al. 1990

Z Phys D - Atoms, Molecules and Clusters

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The impact parameter dependence of the emission of quasimolecular radiation and of quasiresonant K -K transfer has been investigated for collisions of 462 MeV Kr 35+-Mo solid target. The results are compared with calculations based on the MO model for the radiative decay of 1 so. vacancies and nonradiative couplings of the 1so-and 2pa level. The data are discussed with special emphasis of the influence of the solid target. Furthermore the possible influence of nuclear reactions on the MO-spectrum is considered.

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Analysis of time-spectra from coincidence measurements with high stop-rates

Cited by 24 publications

References 8 publications

Coincidence study of electron transfer to the continuum process in collisions at intermediate energies

Coincidence study of electron transfer to the continuum process in collisions at intermediate energies

The impact parameter dependence of the K MO X-ray emission in208Pb +208Pb collisions

Search for interference structures in the quasimolecular X-ray-andK-vacancy production in close collisions of 462 MeV hydrogen-like Kr ions on Mo solid targets

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