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We present the X-ray survey results of high-magnetic-field radio pulsars(high-B PSRs) with Swift/XRT. X-ray observations of the rotation-poweredpulsars with the dipole magnetic field ${\it B_{\rm d}}$ near the quantumcritical field ${\it B_{\rm q}}=4.4\times10^{13}$ G is of great importance forunderstanding the transition between the rotation-powered pulsars and themagnetars, because there are a few objects that have magnetar-like properties.Out of the 27 high-B PSRs that are in the ATNF pulsar catalogue but have notbeen reported or have no effective upper-limits in the X-ray bands, we analyzethe Swift/XRT data for 21 objects, where 6 objects are newly observed and 15objects are taken from the archival data. As a result, we have new $3\sigma$upper-limits for all the 21 objects. Since the upper-limits are tight, weconclude that we do not find any magnetar-like high-B PSRs such as PSRJ1819$-$1458. The probability of the high X-ray efficiency in the high-B PSRsis obtained to be $11\%-29\%$. Combining the previous observations, we discusswhich parameter causes magnetar-like properties. It may be suggested that themagnetar-like properties appear only when ${\it B_{\rm d}}\gtrsim10^{13.5}$ Gfor the radio pulsar population. This is true even if the radio-quiet high-BRPP are included.

A high-magnetic-field radio pulsar survey with Swift/XRT