180mTa excitation by positrons
| Autor: | I. M. Vyshnevskyi, V. O. Zheltonozhsky, A. M. Savrasov |
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| Jazyk: | English<br />Russian<br />Ukrainian |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Âderna Fìzika ta Energetika, Vol 12, Iss 1, Pp 20-26 (2011) |
| Druh dokumentu: | article |
| ISSN: | 1818-331X 2074-0565 |
| Popis: | For the first time the 180mTa excitations cross-sections have been measured at the photonless annihilation of the positrons. The effective cross-sections have been obtained: σef(180mTa) = (4,0 ± 1,0) · 10-25 cm2, and σef(180mTa) = (1,7 ± 0,3) · 10-27 cm2 for the end point energies of the positrons about: 3,9 and 1,0 MeV, accordingly. From the effective cross-sections, the differential cross-sections σph have been calculated. The value of the differential crosssections considerably differs from the existing theoretical calculations. The comparison of the integral cross-sections dependence both the photonless annihilation and (γ γ')-reaction with bremmsstrahlung photons from energy was done. The correlation of the experimental data was shown. |
| Databáze: | Directory of Open Access Journals |
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