|
|||||
|
|
New system for a pulsed slow-positron beam using a radioisotope |
|
| Authors: | E Hamada N Oshima T Suzuki H Kobayashi K Kondo I Kanazawa Y Ito |
| Institution: | a Department of Accelerator Science, The Graduate University for Advanced Studies, Tsukuba, Ibaraki, 305-0801, Japan b Atomic Physics Laboratory, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama, 351-0198, Japan c High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, 305-0801, Japan d Department of Physics, Tokyo Gakugei University, Koganei, Tokyo, 184-0015, Japan e Research Center for Nuclear Science and Technology, The University of Tokyo, Tokai, Ibaraki, 319-1106, Japan |
| Abstract: | To analyze the surface of polymers using positron-annihilation lifetime spectroscopy (PALS), a pulsed slow-positron beam system having both a high pulsing efficiency and a good time resolution is now under development. The time resolution, which is defined by the full width at half maximum (FWHM), and the pulsing efficiency of this system were achieved to be 0.54 ns and 50%, respectively. The lifetime of ortho-positronium (o-Ps) in low-density polyethylene (LDPE), obtained by PALS using our new pulsing system, agreed with that obtained by a conventional PALS. |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ | |