|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ИНХС РАН |
||
Calculations of neutron spectra after neutron-neutron scatteringстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 февраля 2017 г.
- Авторы: Crawford B.E., Stephenson S.L., Howell C.R., Mitchell G.E., Tornow W., Furman W.I., Lychagin E.V., Muzichka A.Yu, Nekhaev G.V., Strelkov A.V., Sharapov and V N Shvetsov E.I.
- Журнал: Journal of Physics G: Nuclear and Particle Physics
- Том: 30
- Номер: 9
- Год издания: 2004
- Издательство: IOP Publishing
- Местоположение издательства: [Bristol, UK], England
- Первая страница: 1269
- Последняя страница: 1285
- Аннотация: A direct neutron–neutron scattering length, ann, measurement with the goal of 3 \% accuracy (0.5 fm) is under preparation at the aperiodic pulsed reactor YAGUAR. A direct measurement of ann will not only help resolve conflicting results of ann by indirect means, but also in comparison to the proton–proton scattering length, app, shed light on the charge-symmetry of the nuclear force. We discuss in detail the analysis of the nn-scattering data in terms of a simple analytical expression. We also discuss calibration measurements using the time-of-flight spectra of neutrons scattered on He and Ar gases and the neutron activation technique. In particular, we calculate the neutron velocity and time-of-flight spectra after scattering neutrons on neutrons and after scattering neutrons on He and Ar atoms for the proposed experimental geometry, using a realistic neutron flux spectrum—Maxwellian plus epithermal tail. The shape of the neutron spectrum after scattering is appreciably different from the initial spectrum, due to collisions between thermal–thermal and thermal–epithermal neutrons. At the same time, the integral over the Maxwellian part of the realistic scattering spectrum differs by only about 6 per cent from that of a pure Maxwellian nn-scattering spectrum.
- Добавил в систему: Лычагин Егор Валерьевич