New precision lifetime measurement of the first excited state of $^{\mathrm{12}}$Be

$^{\mathrm{12}}$Be presents an important opportunity for nuclear structure studies. It has a canonically magic number of neutrons, N $=$ 8, but on the other hand the beryllium isotopes are well-known for their $\alpha $-clustering behavior. $^{\mathrm{12}}$Be is at the limit of computationally feasible GFMC ab initio calculations, and is experimentally accessible for the purposes of making precision measurements. Although recent experiments indicate that $^{\mathrm{12}}$Be favors the development of clustering over magicity, the electromagnetic decay properties of this system are poorly constrained due to the single measurement (\textunderscore 30{\%} uncertainty) of the B(E2; 2$^{\mathrm{+}}$-0$^{\mathrm{+}})$ value. Here we present a new precise measurement of the 2$^{\mathrm{+}}$ state lifetime using GRETINA at NSCL. We find that the lifetime is about a factor of two shorter than previously reported, so even more collective and clustered then expected. The implications for the structure of $^{\mathrm{12}}$Be will be discussed.