Levels in 105Ru populated in thermal neutron capture

Coexisting structures inRu105

“…2. In the present data, the 230-keV level decays also by a second branch of weak transitions with energies of 121 and 108-keV, which were also observed in the (n, γ) [8,9] and β-decay [5] data, confirming that the band is a part of the 105 Ru level scheme. Two more transitions with energies of 204 and 235 keV were observed in coincidence with the 550 and 625-keV γ rays.…”

“…In the shell model approach, some of these states can be interpreted as seniority v = 3 states [19]. Such an interpretation was already suggested in [8] for the ground state, in order to account for the small spectroscopic factor observed in the (d, p) reaction. Indeed, (νd 5/2 ) 3 calculations, shown in Fig.…”

“…A weak 209-keV transition was observed both in the 88 Sr and 89 Sr gated spectra, which suggests that it is in a complementary Ru nucleus. Indeed, this transition de-excites the 7/2 + 1 state in 105 Ru, produced in (n, γ) [8,9] and β-decay [5]. There, the 209-keV transition is the strongest decay branch from the 230-keV 7/2 + 1 level.…”

“…The spin and parity (J π ) assignments to the states, below the 230-keV level, are based on the β-decay feeding [5], on the decay branches of primary transitions observed from the n-capture state at 5.9 MeV [8,9], the L transfer in (d, p) reaction [6,7] and the γ-decay pattern to states with known spins and parities. The J π assignments to the higher-energy states are based on the observed band structure, and for each level -on the γ-decay branches to states with known spin and parity assignments.…”

“…Being just on the edge of the line of β-stability, only few experimental methods can be used to populate its excited states. So far, the nucleus was studied in the 105 Tc β-decay [5], 104 Ru(d,p) reaction [6,7] and n-capture on 104 Ru [8,9]. However, these reaction mechanisms are highly selective and populate only low-spin states.…”