��Ҋ��ݗ��

��r�g��2011-11-15 11:43 ��Դ�� : ��x��2009

�ڷ��o��У��Ҫ�漰��N��͵�ݗ��,��@Щݗ��|(zh��)��Σ��̶ȷ��Ҫ��,��

��һ��α�侀

α�侀��ͨ��Ǐ��Ȼ��Ժ��ط��һ�N��늺ɵ��α��ӌ��H�Ͼ��Ǻ�ԭ�Ӻ�,��x��,��̶̣��͸��,��һ��ͨ�^,��α��ӌ��w��Σ��α��Դ�M�뵽��w��(n��i)��Ҫ��,��͕��ԓ��ɇ�(y��n)��?f��)p��,��ˣ��α��ӵ��w��(n��i)Σ��(d��ng)��ҕ,��

��β�侀

β�侀��ɲ��(w��n)��ԭ�Ӻ˰l(f��)��ĸ��,��f��β�侀ϵָ��ؓ(f��)늵��ӡ�β�侀��һ��x��,��䴩͸��α�侀��ö�,��ܴ�͸Ƥ�w��|(zh��)�Ӷ��p��ԓ�M��һ��J(r��n)��β�侀��һ�N�p΢��Σ��,��Î׺��׵��X��ȫ��ε�β�侀,��β�侀�M��w��Σ��m��α��Ӵ󣬵��ǃ�(n��i)��o��(y��ng)��]�Ć��}֮һ,��

��γ�侀

γ�侀��ɷ��ԭ�Ӻ˃�(n��i)�l(f��)��Ĺ��,��ֱ��ʹ��|(zh��)ԭ��x�򼤰l(f��)��ͨ�^��a(ch��n)��Ĵμ��|(zh��)ԭ�ӵ��x�򼤰l(f��),��x��к܏��؞��,��ַQ؞��ݗ��,��еĂ��ٶȞ�3×108m/s��靓�ڵ��ⲿΣ��,��ʹ��x�_γ�侀Դ�ஔ(d��ng)�h(yu��n)�ĵط�Ҳ��ɇ�(y��n)��Σ��,��˷�ֹ��p��Σ��ڽ^��(sh��)��r�£��Ҫ��γ�侀�M��η��o,��^,��ڃ�(n��i)��r�£�γ��Դ��w��(n��i)��Σ��α��βݗ��ô��,��

��ģ�X�侀

X�侀�Ǹ��Ӵ򵽹��w�Ϯa(ch��n)��һ�N��,��ͨ��X�侀��侀�b�îa(ch��n)��ģ��Щ�a(ch��n)��b��Ҳ�a(ch��n)��һ��X�侀,��X�侀��ܐ��ݗ��͘�(bi��o)�Rݗ��,��|(zh��)�cγ�侀��ͬ��ֻ�Ǯa(ch��n)��C�Ʋ�ͬ,��؞��γ�侀,��

��壩 ��

��Ҫ�ɺ˷��(y��ng)�a(ch��n)��|(zh��)��Դ��|(zh��)�ӵ��|(zh��)��,��Ӳ��,��Ƿ�(w��n)��ģ��İ�˥�ڴ�s��11.0��,��l(f��)��β��˥׃,��0.785MeV��

ʹ�÷��Դ��һ��İ��|(zh��),��ڣ�a,��n��r��n��(y��ng),��ڼ��ø��Ӵ��|(zh��),��ڷ��(y��ng)��׃��|(zh��)��׃��ĳЩ��Ԫ�ص��԰l(f��)��׃��ɮa(ch��n)��ӡ��С��ӷ֞��(С��0.0005MeV),��ӣ�0.02MeV��,��ӣ�0.5MeV~10MeV��ȡ��γ�侀һ��,��һ�N��кܸ�؞��ݗ��,��䲻��늣��ڿ՚��к��|(zh��)��,��ͨ�^�ܴ��x,��ͬ�r��c��|(zh��)�໥��ܮa(ch��n)��_ԭ�Ӻ�,��|(zh��)�Ӻ�γ�侀,��Ӯa(ch��n)��ݗ��Σ��Ч�Լs��γ�侀��2.5��һ�㲻��(g��u)��w��(n��i)Σ��,��]��κ��Ȼ��ӷ��Դ��,��Դ�M��w�ęC��,��

����D(zhu��n)�d��ǳ��ڂ��f��Ϣ֮Ŀ�ġ��Ё�Դ��(bi��o)ע�e�`��ַ��ĺϷ��(qu��n)��,��Ո��߳֙�(qu��n)��C��c��W(w��ng)(li��n)ϵ,��҂��r��h��,��x�x,��