The configurations and level structure of ²¹⁴At

The level structure of ²¹⁴At has been studied using the alpha decay of the ground state and high spin isomer of ²¹⁸Fr and coincident gamma rays. This study was also aided by observing the alpha decay of the ground state and high spin isomer of ²¹⁴At into known levels in ²¹⁰Bi. Four additional levels and minor changes in level energies are observed. Of greater importance is the tentative assignment of a large number of spins and parities. This in turn allows the tentative identification of 9 of the 10 members of the π(h_9/2)³ν(g_9/2)³ configuration which is also calculated theoretically. A survey of the experimental systematics of the π(h_9/2)^mν(g_9/2)ⁿ configuration in the odd-odd nuclei from ²¹⁰Bi to ²¹⁸Fr shows quite clearly the compression of the level structures and the increased mixing between the configurations with the addition of nucleons. This is also mirrored in the theoretical calculations.