Linear-Polarization Measurements on the Gamma Decay from the Doublet at 3.00 MeV inAl27

Abstract

The linear polarization has been measured for the 2.21-, 2.73-, 2.98-, and 3.00-MeV transitions in ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$. The mixing ratios $\delta \left(\frac{E2\mathrm{}}{M1\mathrm{}}\right)$ for these transitions were determined to be $\delta \mathrm{}\left(2.21\right)=-0.57\mathrm{}\pm 0.08$, $\delta \mathrm{}\left(2.73\right)=0.22\mathrm{}\pm 0.09$, and $\delta \mathrm{}\left(2.98\right)=0.05\mathrm{}\pm 0.03$. The 3.00-MeV transition was found to be consistent with a pure $E2\mathrm{}$ transition. The results are compared with the predictions of the rotational-vibrational model of Röpke.