  Kr83m with a short lifetime is an ideal calibration source for liquid xenon
or liquid argon detector. The 83mKr isomer can be generated through the decay
of Rb83 isotope, and Rb83 is usually produced by proton beams bombarding
natural krypton atoms. In this paper, we report a successful production of
Rb83/Kr83m with 3.4 MeV proton beam energy and measure the production rate with
such low proton energy for the first time. Another production attempt was
performed with newly available 20 MeV proton beam in China, the production rate
is consistent with our expectation. The produced Kr83m source has been
successfully injected into PandaX-II liquid xenon detector and yielded enough
statistics for detector calibration.
