When i try to take backup using RMAN (incremental level 0) it was terminated and showing block corruption in system datafile.

I have check the dba_extents and the object is OBJ$

and below message indicated in alert log file

Corrupt block relative dba: 0x00403492 (file 1, block 13458)
Bad check value found during backing up datafile
Data in bad block -
type: 6 format: 2 rdba: 0x00403492
last change scn: 0x0000.0001a9d5 seq: 0x1 flg: 0x06
consistency value in tail: 0xa9d50601
check value in block header: 0x80a7, computed block checksum: 0x8656
spare1: 0x0, spare2: 0x0, spare3: 0x0
Reread of blocknum=13458, file=D:\ORACLE\ORADATA\ORCL\SYSTEM01.DBF. found same corrupt data