| Zugriffsnummer | 23931 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Characterisation of the ANITA white neutron beam |
| Autor(in); Institution |
Nolte, Ralf; 6.4, Ionenbeschleuniger und Referenzstrahlungsfelder, PTB-Braunschweig
Röttger, Stefan; 6.4, Ionenbeschleuniger und Referenzstrahlungsfelder, PTB-Braunschweig
Prokovief, A.; Uppsala University, Svedberg Laboratory, Uppsala, SWEDEN
|
| Quelle/Jahr | EFNUDAT fast neutrons : proceedings of the Scientific Workshop on Neutron Measurements, Theory and Applications ; nuclear data for sustainable nuclear energy:(2010), 123 - 128 |
| Schriftenreihe | EUR: 23883 EN |
| Herausgeber(in) |
Hambsch, F.-J.
|
| ISBN | 978-92-79-11705-3 |
| URL | |
| Verlag | Luxembourg: Publ. Off. of the European Union |
| Konferenzangaben | Fast neutrons - Scientific workshop on neutron measurements, theory & applications, EFNUDAT, Geel, 28-30, April, 2009, Belgium |
| Zusammenfassung | The high-intensity neutron beam facility ANITA was installed recently at the Gustav-Werner cyclotron of the The Svedberg Laboratory in Uppsala/Sweden. A neutron beam with continuous energy distribution is produced by a 177 MeV proton beam impinging in a stopping-length tungsten target. The neutron emission in the forward direction is collimated using a set of steel collimators of variable size. The spectral distribution of the neutron beam extends from the keV region to about the energy of the proton beam and exhibits a low-energy component resulting from neutron evaporation and a high-energy component from (p,xn) reactions. The ANITA neutron spectrum was characterised using a 238U fission ionization chamber and the time-of-flight method. Due to the limited time resolution and fixed repetition frequency of the accelerator, several measurements at different distances had to be combined to derive the spectral fluence above the cut-off energy of about 10 MeV. This was accomplished by using a parameterized model of the neutron spectrum. The most probable value of the parameters was determined by analysing all available measurements simultaneously using the WinBUGS software. The results of this analysis are compared with MCNPX simulations using the recently released TENDL library. Proceedings available online: dx.doi.org/10.2787/23116 |
