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Консультация № 183692
22.06.2011, 01:46
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Фотон с энергией е=1,53 МэВ превратился в пару электрон-позитрон. Принимая кинетическую энергию частиц - одинаковой, определить кинетическую энергию каждой частицы
Фотон с энергией е=1,53 МэВ превратился в пару электрон-позитрон. Принимая кинетическую энергию частиц - одинаковой, определить кинетическую энергию каждой частицы
Обсуждение
22.06.2011, 04:58
общий
это ответ
Здравствуйте, Посетитель - 364448!
Образование пар - это такое взаимодействие фотонного излучения с веществом, при котором энергия фотона в поле ядра переходит в энергию массы покоя и в кинетическую энергию электрона и позитрона. Такое взаимодействие может происходить при энергии фотона не меньше 1.02 МэВ и только в поле ядра. Ядро в соответствии с законом сохранения импульса принимает на себя часть импульса фотона. Если энергия больше 1.02 МэВ, то избыточная энергия уносится электроном и позитроном в виде кинетической энергии. Баланс энергии при образовании пар имеет вид:
, где
- двойная энергия покоя электрона; 
, 
- кинетическая энергия электрона и позитрона, соответственно.
По условию задачи кинетические энергии электрона и позитрона равны.
(МэВ) - энергия фотона (по условию задачи)
(МэВ) - энергия покоя электрона
Следовательно, будем иметь:
(МэВ)
Будут вопросы обращайтесь в минифорум.
Удачи
Образование пар - это такое взаимодействие фотонного излучения с веществом, при котором энергия фотона в поле ядра переходит в энергию массы покоя и в кинетическую энергию электрона и позитрона. Такое взаимодействие может происходить при энергии фотона не меньше 1.02 МэВ и только в поле ядра. Ядро в соответствии с законом сохранения импульса принимает на себя часть импульса фотона. Если энергия больше 1.02 МэВ, то избыточная энергия уносится электроном и позитроном в виде кинетической энергии. Баланс энергии при образовании пар имеет вид:
, где
- двойная энергия покоя электрона; , - кинетическая энергия электрона и позитрона, соответственно.По условию задачи кинетические энергии электрона и позитрона равны.
(МэВ) - энергия фотона (по условию задачи) (МэВ) - энергия покоя электронаСледовательно, будем иметь:
(МэВ)Будут вопросы обращайтесь в минифорум.
Удачи
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