% <PLAINTEXT>
%
% $BNL;RJ*M}3X(B $B!'(B $B1i=,LdBj(B 8-4 $B2rEz(B
% $B:n(B  $B@.(B  $B<T(B $B!'(B 240916J $B9b>k(B $B=E9((B
% $B:n@.G/7nF|(B $B!'(B /02/10/21
% $BEE;R%a!<%k(B $B!'(B g240916@mail.ecc.u-tokyo.ac.jp
%
% \mondai{$B:n@.<T(B}{$B:n@.G/7nF|(B}{$BEE;R%a!<%k(B}{$BLdBjHV9f(B}{$BLdBjJ8(B}{$B2rEz(B}
%
\mondai
{240916J $B9b>k(B $B=E9((B}
{/02/10/21}
{g240916@mail.ecc.u-tokyo.ac.jp}
{8-4}
{
%----$BLdBjJ8(B----%
$B#2<!85$N1_7A$N0f8M$G!"0f8M$N30B&$N9b$5$,L58BBg$N>l9g$K$O!"GHF04X?t$O0f8M$N30$K$7$_$@$5$J$$!#$3$N>l9g8GM-4X?t$O%Y%C%;%k4X?t$NNmE@!J4X?tCM$,(B0$B$K$J$kE@!K$H4X78$9$k$3$H$r@bL@$;$h!#%Y%C%;%k4X?t$N?^(B8.5$B$r8+$J$,$i@bL@$;$h!#(B
}
{
%----$B2rEzJ8(B---%
$B8GM-4X?tCf$N(B$k$$B$,%Y%C%;%k4X?t$NNmE@$H4X78$9$k$3$H$r<($9!#(B\\
$B0f8M$N30$K$7$_$@$7$O$J$$$N$G!"0f8M$NFbB&!J(B$0<r<a$$B!K$NGHF04X?t$N$_$r9M$($l$PNI$$!#(B
$\varphi=R(r)\Theta(\theta)$B$G$"$j!"%7%e%l%G%#%s%,!<J}Dx<0$r2r$/$H(B$
\begin{equation}
R_l(r)=C_{al}J_l(kr)+C_{bl}N_l(kr)
\end{equation}
$B$rF@$k!#(B
$r=0$B$G!"(BN_l(kr)$B$O86E@$GH/;6$9$k$?$a!J?^(B8.5$B!"(BN_l(r)$B!K78?t(BC_{bl}$B$O(B0$B$K$J$k!#(B$\\
$B$h$C$F(B
\begin{equation}
R_l(r)=C_{al}J_l(kr)
\end{equation}
$R_l(a)=0$B$h$j!"(BC_{al}J_l(ka)=0
$B$h$C$F!"(BJ_l(ka)=0$
$B$3$3$G?^(B8.5$B$G!"=D<4$r(B$J_l(kr)$$B2#<4$r(B$kr$$B$H$9$l$P(B$J_l(kr)=0$$B$N$H$-$N(B$kr(=ka)$$B$NCM$,$o$+$k!#(B
$B$3$l$h$j!"%Y%C%;%k4X?t$NNmE@$,(B$r=a$$B!JDj?t!K$H$J$k$h$&$K(Bk$B$,Dj$a$i$l$k!#(B
}



