0105618 - UJF-V 20043186 RIV NL eng J - Článek v odborném periodiku
Karamian, S. A. - Adam, Jindřich - Čaloun, Pavel - Filossofof, D. V. - Henzl, V. - Henzlová, Daniela - Kalinnikov, V. G. - Korolev, N. A. - Lebedev, N. A. - Novgorodov, A. F. - Collins, C. B. - Popescu, I. I. - Ur, C. A.
Yield of radionuclides and isomers produced in the fragmentation of W-nat and W-186 (97.
[Výtěžek radionuklidů a izomerů produkovaných ve fragmentaci terčíků W-nat a W-186 (97 %) protony při 630, 420 a 270 MeV.]
Nuclear Instruments & Methods in Physics Research Section A. Roč. 527, č. 3 (2004), s. 609-623. ISSN 0168-9002. E-ISSN 1872-9576
Grant CEP: GA AV ČR KSK2067107
Klíčová slova: protons * spallation * target activation
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 1.349, rok: 2004

Yields and cross-sections of the radioactive nuclides produced after the irradiation of natural composition W and enriched W-186 targets at the Dubna synchrocyclotron were measured using the gamma-ray spectroscopy methods with high-resolution Ge detectors. Among the detected nuclides we identified the spallation and fission products. High-spin isomeric states in the Hf and Lu nuclides were populated and the isomer-to-ground state ratios could be estimated. The nuclide yields were calculated using the LAHET code at six different values of the proton energy in the range from 100 to 800 MeV both for the W-nat and enriched 186W targets. The measured isotope yields are in general good agreement with the calculations. A shortcoming of the code is the inability to predict isomer-to-ground state ratios. The experimental data show that the Lu-177m, Hf-178m2 and Hf-179m2 high-spin isomers are produced with a 2.5 times higher yield in the 97% enriched W-186 target as compared to the W-nat target under identical irradiation conditions. This makes significance for the creation of high-activity isomeric sources. The mass-distribution of the products and the fission-to-spallation ratio were also deduced and compared with theory prediction.

Výtěžky a účinné průřezy radioaktivních nuklidů produkovaných po ozáření terčíků přírodní směsi W a obohaceného W-186 jsou měřeny prostřednictvím gama spektroskopických metod.
Trvalý link: http://hdl.handle.net/11104/0012852