Total and differential conversion coefficients for internal electron-positron pair creation

Schlüter, Paul; Soff, G.

doi:10.1016/0092-640x(79)90008-1

Cited by 51 publications

(22 citation statements)

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“…Nuclear transition energies of 1,323keV, 1,423keV, 1,523keV and Obviously the ratio fi determines the number of created electron-positron pairs divided by the number of created photons. For details concerning the theoretical formalism and for the numerical numbers we refer to [4][5][6]. Similar positron distributions as in Fig.…”

Section: Results and Conclusionmentioning

confidence: 99%

“…b) Intrinsic nuclear excitations may take place either by Coulomb excitation or by transfer reactions. The nuclear transition can be accompanied by internal electronpositron pair creation [4][5][6]. Contrary to E0-processes nuclear transitions of multipolarity E1 or E2 should also be observable in the emitted photon spectra provided that proper Doppler shift corrections are performed as in [7].…”

Section: Introductionmentioning

confidence: 99%

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Internal electron-positron pair production from electric monopole transitions

Soff¹,

Schlüter

Greiner

1981

Z Physik A

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Nuclear E0-transitions above the pair production threshold of co--2rn c2,-, 1 MeV are considered. The ration r/of the electron-positron pair creation probability to the K-shell conversion probability is calculated. For 92U and co= 1,450keV a typical value of t/ =2,10 .3 is obtained. Good agreement with experimental data is found. Our numerical results for finite size nuclei are compared with analytical expressions utilizing relativistic electron wavefunctions for point nuclei. The energy distributions of emitted positrons are presented for various nuclear charge values and transition energies. The possibility of monoenergetic positron emission is discussed. Of particular interest is the relation of the theoretical results to the recently observed structure in the positron spectra, which have been measured in high energy collisions of very heavy ions.

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Section: Results and Conclusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Internal electron-positron pair production from electric monopole transitions

Soff¹,

Schlüter

Greiner

1981

Z Physik A

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“…Two data sets, ScPcc (for Zo50Þ [32] and HoPcc (for ZX50) [33] have been assembled to obtain conversion coefficients for electron-positron pairs. While Schlu¨ter and Soff [32] have used the point nucleus approximation, the later calculations of Hofmann and Soff [33] assumed a homogenously charged sphere to take into account the finite nuclear size.…”

Section: Conversion Coefficients For Electron-positron Pairs (Scpcc Amentioning

confidence: 99%

“…While Schlu¨ter and Soff [32] have used the point nucleus approximation, the later calculations of Hofmann and Soff [33] assumed a homogenously charged sphere to take into account the finite nuclear size. It is assumed that for Zo50 atomic numbers the effect is negligible ðo1%Þ.…”

Section: Conversion Coefficients For Electron-positron Pairs (Scpcc Amentioning

confidence: 99%

Evaluation of theoretical conversion coefficients using BrIcc

Kibédi

Burrows

Trzhaskovskaya

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

837

530

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“…The process of IPC competes with γ-rays as described by IPC coefficients [21], These coefficients differ for different multipolarities of the nuclear transitions. They are largest for El decays-a few times 10" 5 for energies below 10 MeV-and do not strongly depend on Ζ (The E0 transitions are different in that they cannot proceed by γ-radiation but only with K-, L-,... conversions, by IPC or by higher order processes) Recently the theoretical description of IPC has been extended to the strong Coulomb fields during high-Z collisions [22].…”

Section: Unauthenticatedmentioning

confidence: 99%