supported by the National Natural Science Foundation of China(Grant Nos.10974189,10675114,10675115,and 41075027);the Natural Science College Key Projects of Anhui Province,China(Grant No.KJ2011A040)
The elementary excitation spectrum of a two-component Bose-Einstein condensate in different hyperfine states is obtained by Green's function method. It is found to have two branches. In the long wave-length limit, th...
Supported by Major Program of National Natural Science Foundation of China (10835006);National Natural Science Foundation of China (10675114)
A new slow pulsed positron beam, including a positron source, a moderator, a chopper, a prebuncher, a main-buneher and a sample chamber, etc, has been installed and tested. It is necessary to simulate the acceleration...