180mTa excitation by positrons
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...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Institute for Nuclear Research, National Academy of Sciences of Ukraine
2011-03-01
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| Series: | Ядерна фізика та енергетика |
| Subjects: | |
| Online Access: | http://jnpae.kinr.kiev.ua/12.1/Articles_PDF/jnpae-2011-12-0020-Vyshnevskyi.pdf |
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| Summary: | 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. |
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| ISSN: | 1818-331X 2074-0565 |