Single-particle isomeric states in¹²¹Pd and¹¹⁷Ru

Abstract

Neutron-rich nuclei were populated in a relativistic fission of 238 U. Gamma-rays with energies of 135 keV and 184 keV were associated with two isomeric states in 121 Pd and 117 Ru. Half-lives of 0.63(5) µs and 2.0(3) µs were deduced and the isomeric states were interpreted in terms of deformed single-particle states.

Core-coupled states and split proton-neutron quasiparticle multiplets in122−126Ag

“…and B(M 2; 17/2 − → 13/2 + ) = 3.2(8) × 10 −4 W.u. values, calculated with α(103γ; E2) = 1.324 and α(787γ; M 2) = 0.0056 [30], are consistent with the hindrance factor systematics [31]. Fig.…”

“…13 after time-walk correction was applied for the 75-keV feeding transition. Thus, a half-life of [30], are consistent with the systematics [31]. An M 1/E2 multipolarity assignment for the 155-keV transition is also possible for δ ≤ 0.1.…”

“…Both values are consistent with the hindrance factor systematics in ref. [31], but for higher multipolarities the 48-keV transition would be enhanced from three to nine orders of magnitude and hence very unlikely. Also, the intensity balance, performed for the 1425-keV level, suggests that the 48-keV γ-ray intensity will be 69% of the intensity of the 713-keV transition in case of E1 multipolarity, and 7.5% if it is an E2 transition.…”

“…11 shows the time distribution of the 91-keV transition. A half-life of t 1/2 = 6.3(10) µs was obtained from the slope, which suggests E1 or E2 multipolarity, given that only B(E1) α(91γ; E2) = 2.02 [30] are consistent with the hindrance factor systematics [31]. Similar low-lying µs isomeric states were observed in the neutron-rich 126,128,130 In [19] and related to the decay of the 1 − and 3 + states.…”

Coexisting structures inRu105

“…105 Ru is located on the Segré chart between its heaviest stable isotope 104 Ru [1] and the most exotic 117,118,119 Ru nuclei, produced in relativistic fission [2][3][4]. Being just on the edge of the line of β-stability, only few experimental methods can be used to populate its excited states.…”