Figure 1

Schematic (not to scale) representation of $\gamma$ decay following neutron capture in ${}^{95}$Mo. In our experiments, resonance energies were less than 10 keV, which is negligible compared to $B_n=9154.32\pm 0.05$ keV for ${}^{95}$Mo, and hence not included in the simulations. The total $\gamma$ width ${\Gamma }_{\gamma }$ determined in our $\mathcal{R}$-matrix analysis is the sum of the thousands of partial widths for all primary transitions, three of which are depicted as solid red arrows. Subsequent $\gamma$ transitions, depicted by dashed black arrows, do not contribute to ${\Gamma }_{\gamma }$ and hence are not part of the simulations.Reuse & Permissions

Figure 2

Two different spin indices calculated from singles and coincidence pulse-height spectra. $J_1$ was calculated from the ratio of counts in two different regions of the singles pulse-height spectra. $J_3$ was calculated from the ratio of counts in regions of the coincidence and singles pulse-height spectra. Open circles with (one-standard-deviation) error bars depict results for all resonances analyzed herein. Pulse-height ratios were scaled so that the data clusters would occur near integer values. See text for details.Reuse & Permissions

Figure 3

Histogram of weighted averages of the three spin indices for resonances analyzed herein. Data for two of the three spin indices are shown in Fig. 2.Reuse & Permissions

Figure 4

Histogram of weighted averages of the three parity indices for resonances analyzed herein. Shown are the combined results for $J=2$ and 3 resonances. Indices were scaled so that negative- and positive-parity resonances would cluster around $-1$ and 1, respectively.Reuse & Permissions

Figure 5

Energy-reduced values of observables $g_J{\Gamma }_{\lambda n}$ for ${}^{95}$Mo neutron resonances $\lambda$ at energies $E_{\lambda }$. The statistical factor for resonances having spin $J$ is given by $g_J=(2J+1)/\left[(2I+1)(2j+1)\right]$, where $I$ and $j$ are the target and neutron spin, respectively. Resonances assigned $J^{\pi }=1^{-}$ are depicted as open blue squares, 2${}^{-}$ are open light red triangles, 2${}^{+}$ are filled light red triangles, 3${}^{-}$ are open dark red circles, 3${}^{+}$ are filled dark red circles, and 4${}^{-}$ are open green diamonds. A solid black curve indicates the threshold used to correct average resonance parameters for missed resonances.Reuse & Permissions

Figure 6

Cumulative ${\Gamma }_{\gamma }$ distributions for ${}^{95}\mathrm{Mo}+n$ resonances. Each panel shows the fraction of resonances having ${\Gamma }_{\gamma }$ larger than a certain size vs the size. Data from the present work and those based on previous firm $J^{\pi }$ values are shown as open blue circles and black x's, respectively. Error bars depict one-standard-deviation uncertainties as reported by sammy. Statistical-model simulations with and without an added doorway are shown as solid black and dashed red curves, respectively. Simulated ${\Gamma }_{\gamma }$ values have been normalized by factors of 0.75, 0.9, 0.85, 1.1, 1.0, and 1.2 for 1${}^{-}$, 2${}^{-}$, 3${}^{-}$, 4${}^{-}$, 2${}^{+}$, and 3${}^{+}$ resonances, respectively. Not shown is the smallest 2${}^{-}$ ${\Gamma }_{\gamma }$ $(39.7\pm 2.9$ meV).Reuse & Permissions

Figure 7

Different $E1$ (top) and $M1$ (bottom) PSFs used in the simulations. The first five curves represent theoretical models used in the code talys[20]. The solid black and long-short-dashed brown curves are from the measurements of Refs. [1, 2, 3], respectively. Location of the neutron binding energy $B_n$ is indicated by the dashed vertical red lines.Reuse & Permissions