 This state does not have enough energy to undergo strong particle decay, and because of the large spin difference, gamma decay from the 21/2 state to the 13/2 state below is very unlikely.The more likely decay option is beta decay, which forms an isomer with an unusually long half-life of 14 seconds.An exceptional example is the J=9 state of tantalum-180, which is a very low-lying yrast state only 77 keV above the ground state.