Nuclear Data Sheets for A = 200

High-resolution study of excited0+states in200Hg and202Hg

“…The respective R(5/17.5) ratios are plotted in Fig. 2 Table I up to 1857-keV excitation energy were already known as 0 + states [16] and we confirm their spin assignment. We observe two more states clearly exceeding the R(5/17.5) = 3 limit: One state at 2246-keV excitation energy is observed with R(5/17.5) = 4.97(68).…”

“…For each nucleus, the experimental runs were normalized to the integrated beam current measured in a Faraday cup behind the target. The measured triton spectra were calibrated using well-known level energies of 200 Hg and 202 Hg compiled in the Nuclear Data Sheets [16,17]. Contaminants stemming from target impurities were identified by using the known Q values of the corresponding (p, t) transfer reaction [18].…”

“…We observe two more states clearly exceeding the R(5/17.5) = 3 limit: One state at 2246-keV excitation energy is observed with R(5/17.5) = 4.97(68). In the Nuclear Data Sheets [16], the spin of this state is given as J π = (1, 2) + , based on the measured mixed M 1 + E2 multipolarity of its γ-ray transition to a 1 + state [19]. The observed mixed multipolarity in Ref.…”

“…At 2332-keV excitation energy, a state exceeds the R(5/17.5) = 3 limit with relatively large uncertainties. In the data sheets [16], the level spin is listed as J = 2 + and an observed γ-ray transition to a 4 + state rules out a possible spin J = 0 + assignment. However, according to the γγ coincidence data from ILL [20,21], the 1385.0-keV transition to the 4 + state is incorrectly placed in the level scheme.…”

“…This might have caused the incorrect placement of the 1385-keV γ-ray in the level scheme between the level at 2332 keV and the 4 + 1 state at 947-keV excitation energy [16], although this placement is questioned in Fig. 6 of Ref.…”