<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>-vacancy production in heavy-ion collisions. II. Multiple- and single-collision excitation in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:mi>p</mml:mi><mml:mi>σ</mml:mi></mml:math>molecular orbital

Meyerhof, W. E.; Anholt, R.; Saylor, T. K.

doi:10.1103/physreva.16.169

Cited by 93 publications

(21 citation statements)

References 77 publications

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“…They fall off nearly exponentially for impact parameters above 500 fm. Below 500 fro, the ionization probability flattens until about 200 fm where a steep rise of the probability is They agree within the error bars with the values obtained by different authors [15,32]. The measured K X-ray yields were converted into K-vacancy production probabilities by taking into account the Kshell fluorescence yields co K for I and Ag.…”

Section: Results and Analysis Of The Datamentioning

confidence: 66%

Impact parameter dependence ofL- andK-shell excitation in I-Ag collisions

Morenzoni¹,

Nessi²,

Bürgy³

et al. 1983

Z Physik A

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The impact parameter dependence of the L-and K-vacancy production of target and projectile was measured in I-Ag collisions at 40 MeV and 63 MeV in a X-ray particle coincidence experiment. A large L-vacancy production is found for impact parameters b smaller than the L-shell radius with a pronounced increase for b<250 fm. The L-shell excitation is discussed in terms of 4f~ excitation and vacancy transfer in the 3pa, 3d~z, 3 da molecular orbitals through 3 p ~-3 p a and 3 d 6-3 drc-3 d o-rotational-couplings. The 2pa excitation probability is obtained from the summed K-vacancy production probability, and compared with the prediction of 2pa excitation in a multiple collision process. The latter is determined by folding the measured I L-shell excitation probability with the impact parameter dependence of the 2p~-2pa rotational coupling. The discrepancy observed at small impact parameters suggests an enhanced 2p~ and 2pa excitation at small impact parameters in a one-collision process. The L-and K-vacancy sharing probabilities are found to be impact parameter independent over a large impact parameter range.

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Section: Results and Analysis Of The Datamentioning

confidence: 66%

Impact parameter dependence ofL- andK-shell excitation in I-Ag collisions

Morenzoni¹,

Nessi²,

Bürgy³

et al. 1983

Z Physik A

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“…Theory Figure 1 shows a schematic correlation diagram for Nb+Nb collisions [14]. Due to the repeated excitation and decay of projectile 2p vacancies as the projectile moves through solid targets [15], there may, in such a collision, be a 2p vacancy present on the projectile. The 2p vacancy has a probability of 1/6 of correlating to the 2p~, MO, there being 6 different MOs to which any 2p vacancy may correlate.…”

Section: Stoller Et Al Found That the Anisotropy Defined As Q(e~) =mentioning

confidence: 99%

“…vacancy formation followed by 2p~r-2p~ rotational coupling is the dominant mechanism for the formation of projectile and target K vacancies [15]. Thus we can write [2] 1 dO-MO -1 dO'MO expt (12) (rzp dE~ 0-2 p expt dE~ where C%p= ~27~bdb PEp(b) is the calculated 2pa (pro-0 jectile + target K) vacancy production cross section assuming the presence of one projectile 2p vacancy, dago/dE ~ is calculated from (7) assuming the presence of one projectile 2p vacancy, 0"2pexpt is the measured 2pa vacancy production cross section and dffMO~xpjdE x is the measured MO X-ray production cross section.…”

Section: A Relation Between One-electron Calculations and Experimentsmentioning

confidence: 99%

Theory of the angular distribution of 2p? molecular orbital X-rays

Anholt

1979

Z Physik A

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The cross section and anisotropy of 2pa molecular-orbital X-ray emission is calculated for 35-to 75-MeV Nb + Nb collisions. The calculated intensities are a factor of 1.5 lower than the measured ones. The 2pa molecular-orbital X-ray anisotropy is in good agreement with experiment. When one includes the Coriolis coupling between the 2pa and 2pTr and between the 3da, 3dn, and 3d5 molecular orbitals, the 2pa-line-tail intensity is greatly reduced below that calculated by J~iger et al., neglecting the Coriolis coupling. The implications of these calculations to the possible spectroscopy of superheavy quasimolecules are discussed, andsome suggestions aremade to improve the accuracy of the spectroscopy measurements.

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“…For Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphys:01990005108073500 atoms respectively, both direct excitation mechanism and electron capture [6] are the dominant ways of producing a K vacancy in the lighter collision partner. At rather low projectile velocities (vp « v2K) and nearly symmetric collision systems (Zp -Zt ), the molecular model [3,[7][8][9] gives a good description of K vacancy production via the promotion of electrons from the K-shell to higher orbitals. In the case of direct Coulomb excitation, the ECPSSR theory that includes corrections for the Coulomb trajectory, the relativistic effects, and projectile energy loss in the target [10], seems to reproduce the measured cross-sections quite well for many collision systems [1].…”

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confidence: 99%

“…Following Meyerhof et al [3,9], this data can be tentatively divided into three regions. The bell shaped central region (22 --Zt ,-62) having a near exponential dependence on Z1' and the regions with Zt « ZP = 41 or Zt > ZP = 41, for which, with the exception of Erbium (Zt = 68), the measured cross-sections vary rather smoothly with Zt (see Fig.…”

mentioning

confidence: 99%

Target and projectile K x-ray production by 100, 160, and 200 MeV Nb collisions with thick solid targets

Liarokapis

Zouros

1990

J. Phys. France

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Résumé. 2014 On donne les valeurs des sections efficaces de production de rayons-x K dans des collisions par des projectiles de K-vacancy production theories were tested over this broad range including electron promotion with vacancy sharing (molecular model), direct excitation (ECPSSR theory), modified binary encounter approximation (BEA), as well as some semi-empirical recipes. For most of the collision systems investigated the molecular model is found to be the dominant mechanism for K-vacancy production in both projectile and target. For highly asymmetric collisions, the ECPSSR calculations are found to be within a factor of two of the data for the lightest targets (C, Al), but fail for the heaviest targets.

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K-vacancy production in heavy-ion collisions. II. Multiple- and single-collision excitation in the2pσmolecular orbital

Cited by 93 publications

References 77 publications

Impact parameter dependence ofL- andK-shell excitation in I-Ag collisions

Impact parameter dependence ofL- andK-shell excitation in I-Ag collisions

Theory of the angular distribution of 2p? molecular orbital X-rays

Target and projectile K x-ray production by 100, 160, and 200 MeV Nb collisions with thick solid targets

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