Experimental evidence on the ground-state energy of 229Pa

Abstract: The E1 transition from the 3/2− state to the ground state of 229Pa was identified in the (p,tγ) reaction. Its energy is found to be 11.6(3) keV. This leads to a value of Qg.s.=−4133(2) keV and to a mass defect of 229Pa of 29894(3) keV. It is concluded that the ground-state configuration of 229Pa is 3/2[651].