Just had the same exact issue with my rear axle. broke it riding xc/am type terrain. actual broke occurred when I hit a very small jump and landed slightly off camber, didnt crash but that was the end of this ride.
I'm 6'0" 205lbs toss on another ~5lbs with camelback gear.
I may try out the through axle conversion, can't hurt. ...its that or a new wheel set.
here is the part number to replace it from mavic -
308 704 01
hope this helps someone else.