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The structure of $^{83}$As, $^{85}$As and $^{87}$As have been studied infusion-fission reaction $^{238}$U+$^9$Be. Fission fragments were identified inmass and atomic number using the VAMOS++ spectrometer and the coincident$\gamma$-rays were detected in the $\gamma$-ray tracking array AGATA. Newtransitions in $^{83}$As and $^{85}$As are reported and placed in the levelschemes. A level scheme of the excited states in $^{87}$As is proposed for thefirst time. The data are interpreted in frame of Large-Scale Shell-Modelcalculations, SU3 symmetries and Beyond Mean-Field frameworks. A sphericalregime at magic number $N$=50 is predicted and the location of the proton$g_{9/2}$ orbital is proposed for the first time. Development of collectivityin a prolate deformed, $\gamma$-soft regime in the open shell cases $^{85}$Asand $^{87}$As, most neutron-rich isotopes beyond $N$=50, is concluded. Data andtheoretical calculations give confidence to a relatively high extrapolatedexcitation energy about 4 MeV of the $9/2^+$ state in $^{79}$Cu, one protonabove $^{78}$Ni.

Structure of $^{83}$As, $^{85}$As and $^{87}$As: from semi-magicity to $\gamma$-softness