Implications for Radiative-Strength Functions from Neutron Capture inCl35

A comparison of neutron-capture $\gamma$-ray spectra in neighboring $s$- and $p$-wave-capture states in a ${}_{}{}^{35}{}_{}{}^{}\mathrm{Cl}$ target shows two sharp departures from what is normally expected from a compound-nucleus process. The spectra are highly correlated, with $r=+{0.84}_{-0.10\mathrm{}}^{+0.16\mathrm{}}$, and $E1\mathrm{}$ and $M1\mathrm{}$ strengths are comparable. The $E1\mathrm{}$ strength can be explained by the $E1\mathrm{}$ giant resonance; it is consistent with the Axel prediction for a $A^{\frac{8}{3}}$ dependence. $M1\mathrm{}$ strengths agree with single-particle estimates, in sharp contrast to heavy nuclides.