$B;0$rD4$Y$F=`Hw9;$^$G(B $B$*CN$i$;2<$5$$!#(B $B3:Ev$9$k!J(B19$BF|$K=P @ J2DG=!K$H;W$o$l$k$N$O!"(B $BAGN3;RO @ $NH*$5$s(B $B86;R3K$N?9ED$5$s(B $B$ @ $H;W$$$^$9!#(B $B=P @ J$5$l$k>l9g$O!";22CHq(B2,500$B1_$r mailto:yshimono @ particle.sci.hokudai.ac.jp ============================================