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EnglishProduction of Cs and Fr isotopes from uranium carbide targets of a high density has been investigated at IRIS (Investigation Radioactive Isotopes at Synchrocyclotron), Gatchina. The UC target material with a density of 12 g/cm3 was prepared in a form of pellets. Two targets were tested on-line under the same temperature conditions: (a) a reference small target with a thickness of 4.5 g/cm2; (b) a heavier (so called intermediate) target with a thickness of 91 g/cm2. Yields and release efficiencies of nuclides with half-lives from some minutes to some milliseconds produced by 1 GeV protons in these targets are presented. It is remarkable that yields, even those of very short-lived isotopes such as 214Fr (T1/2 = 5 ms) and 219Fr (T1/2 = 20 ms), increase proportionally to the target thickness. A one month off-line heating test of the 91 g/cm2 target at a temperature of 2000 °C has been carried out successfully. The yields and release efficiencies of Cs and Fr measured on-line before and after the heating test coincided within the limits of measurement errors, thereby demonstrating the conservation of the target unit parameters. Based on these very promising results, a heavier target with a mass about 0.7 kg is prepared presently at IRIS.
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| Data di pubblicazione: | 2008 | |
| Titolo: | Studies of uranium carbide targets of a high density | |
| Autori: | Panteleev, V.N; Alyakrinskiy, O.; Barbui, M.; Barzakh, A.E.; Dubois, M.; Eleon, C.; Essabaa, S.; Fedorov, D.V.; Gaubert, G.; Ionan, A.M.; Ivanov, V.S.; Jardin, P.; Lau, C.; Leroy, R.; Lhersonneau, G.; Mezilev, K.A.; Mhamed, C.; Molkanov, P.L.; Moroz, F.V.; Orlov, S.Yu.; Saint Laurent, M.G.; Stroe, L.; Tecchio, L.B.; Tonezzer, M.; Villari, A.C.C.; Volkov, Yu.M. | |
| Rivista: | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION B, BEAM INTERACTIONS WITH MATERIALS AND ATOMS | |
| Parole Chiave: | Delay time; Ionising target; Massive target; Uranium carbide target; Yield; Instrumentation; Nuclear and High Energy Physics | |
| Abstract: | Production of Cs and Fr isotopes from uranium carbide targets of a high density has been investigated at IRIS (Investigation Radioactive Isotopes at Synchrocyclotron), Gatchina. The UC target material with a density of 12 g/cm3 was prepared in a form of pellets. Two targets were tested on-line under the same temperature conditions: (a) a reference small target with a thickness of 4.5 g/cm2; (b) a heavier (so called intermediate) target with a thickness of 91 g/cm2. Yields and release efficiencies of nuclides with half-lives from some minutes to some milliseconds produced by 1 GeV protons in these targets are presented. It is remarkable that yields, even those of very short-lived isotopes such as 214Fr (T1/2 = 5 ms) and 219Fr (T1/2 = 20 ms), increase proportionally to the target thickness. A one month off-line heating test of the 91 g/cm2 target at a temperature of 2000 °C has been carried out successfully. The yields and release efficiencies of Cs and Fr measured on-line before and after the heating test coincided within the limits of measurement errors, thereby demonstrating the conservation of the target unit parameters. Based on these very promising results, a heavier target with a mass about 0.7 kg is prepared presently at IRIS. | |
| Digital Object Identifier (DOI): | 10.1016/j.nimb.2008.05.045 | |
| Handle: | http://hdl.handle.net/11392/2341392 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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