Level structure neutron-rich $^{80,82}$Se isotopes

Neutron-rich $^{80,82}$Se isotopes were studied using the Gammasphere Ge-detector array at ANL. Beams of $^{76}$Ge and $^{82}$Se were incident upon thick $^{238}$U and $^{208}$Pb targets in deep-inelastic reactions. The indication of triaxiality in $^{78}$Ge has recently been presented from a low-energy sequence of strictly $\Delta J=1$ transitions [1]. Isotonic $^{80}$Se exhibits none of the special features found in $^{78}$Ge. New data in $^{82}$Se will be presented to clarify $\beta$-decay studies [2,3], and angular-correlation measurements are used to strengthen spin and parity assignments in some cases. NuShellX calculations for the N = 46 and N = 48 isotones will be shown to test the $p_{3/2}f_{5/2}p_{1/2}g_{9/2}$ proton and neutron subspace [4]. [1] A. M. Forney, W. B. Walters, C. J. Chiara, R. V. F. Janssens, A. D. Ayangeakaa, J. Sethi, J. Harker, M. Alcorta, M. P. Carpenter, G. G\"urdal, C. R. Hoffman, B. P. Kay, F. G. Kondev, T. Lauritsen, C. J. Lister, E. A. McCutchan, A. M. Rogers, D. Seweryniak, I. Stefanescu, and S. Zhu. Submitted (2018). [2] J.V. Kratz, H. Franz, N. Kaffrell, G. Hermann. Nucl. Phys. A 250 13-37 (1975). [3] H. Gausemel, K. A. Mezilev, B. Fogelberg, P. Hoff, H. Mach, and E. Ramstr\"om Phys. Rev. C 70, 037301 (2004). [4] B.A. Brown and W.D.M. Rae.