Neutron configurations in ${}^{113}\mathrm{Pd}$

Excited states in ${}^{113}\mathrm{Pd}$, populated in ${\beta }^{-}$ decay of ${}^{113}\mathrm{Rh}$ and in spontaneous fission of ${}^{248}\mathrm{Cm}$ and ${}^{252}\mathrm{Cf}$, have been studied by means of $\gamma$ spectroscopy at the IGISOL facility of Jyväskylä University and using large arrays of Ge detectors (Eurogam2 and Gammasphere, respectively). The position of the ${\mathrm{11/2}}^{-}$ yrast excitation in ${}^{113}\mathrm{Pd}$, proposed recently at 166.1 keV by other authors, has been corrected to 98.9 keV. The decay of this level has been discussed to explain the observed transition intensities. The ${\mathrm{7/2}}^{-}$ member of the yrast, unique-parity configuration has been identified at 84.9 keV and a band on top of this level proposed. On top of the 1/2+, first excited state a band has been built and a new 3/2+ bandhead has been proposed at 151.9 keV. A possible oblate-shape origin of these low-energy bandsheads has been discussed.

Figure 1

Low-energy part of a $\gamma$ spectrum from fission of ${}^{252}\mathrm{Cf}$, doubly gated on the 383.1- and 570.8-keV lines of ${}^{113}\mathrm{Pd}$, measured using the Gammasphere array. Peaks are labeled with their energies in keV.

Figure 2

A spectrum of $\gamma$ rays following fission of ${}^{252}\mathrm{Cf}$, doubly gated on the 570.8- and 722.3-keV lines of ${}^{113}\mathrm{Pd}$, measured using the Gammasphere array. Peaks are labeled with their energies in keV.

Figure 3

A spectrum of $\gamma$ rays following fission of ${}^{252}\mathrm{Cf}$, doubly gated on 576.1- and 717.6-keV lines, measured with Gammasphere array. Peaks are labeled with their energies in keV.

Figure 4

A spectrum of $\gamma$ rays following fission of ${}^{252}\mathrm{Cf}$, doubly gated on 425.0- and 576.1-keV lines, measured with Gammasphere array. Peaks are labeled with their energies in keV.

Figure 5

A spectrum of $\gamma$ rays following fission of ${}^{252}\mathrm{Cf}$, doubly gated on 407.4- and 576.1-keV lines, measured with Gammasphere array. Peaks are labeled with their energies in keV.

Figure 6

A spectrum of $\gamma$ rays following fission of ${}^{248}\mathrm{Cm}$, doubly gated on 407.4- and 576.1-keV lines, measured with the Eurogam2 array. Peaks are labeled with their energies in keV.

Figure 7

Mass correlation diagram for Pd and Te complementary fission fragments populated in fission of ${}^{252}\mathrm{Cf}$. See text for further explanation.

Figure 8

Scheme of negative-parity excitations in ${}^{113}\mathrm{Pd}$ as determined in the present work.

Figure 9

A spectrum of $\gamma$ rays following ${\beta }^{-}$ decay of ${}^{113}\mathrm{Rh}$ measured in the mass $A=113$ separated with the IGISOL facility. The gate is set on the 84.8-keV line. Panels (a) and (b) present the low- and high-energy parts of the spectrum, respectively. Peaks are labeled with their energies in keV.

Figure 10

Partial level scheme of positive-parity excitations in ${}^{113}\mathrm{Pd}$, populated in ${\beta }^{-}$ decay of ${}^{113}\mathrm{Rh}$, as observed in the present work. Note that the 84.9-keV line belongs to the negative-parity scheme shown in Fig. 8. The 97.0-, 252.2-, 176.4-, 197.0-, and 257.4-keV transitions populate (or depopulate) respective levels at 252.2, 172.6, and 151.9 keV.

Figure 11

A double-gate spectrum of $\gamma$ rays following fission of ${}^{248}\mathrm{Cm}$, measured with Eurogam2 array. The first gate is set on the 189.8-keV line and the second gate is set on all other lines in the cascade. Peaks are labeled with their energies in keV.

Figure 12

A spectrum of $\gamma$ rays following ${\beta }^{-}$ decay of ${}^{113}\mathrm{Rh}$ measured in the mass $A=113$ separated with the IGISOL facility. The gate is set on the 221.2-keV line. Peaks are labeled with their energies in keV.

Figure 13

Low-energy part of a $\gamma$ spectrum from the mass chain $A=113$ separated by IGISOL. The spectrum in (a) was gated by $\beta$ events in the plastic scintillator. The spectrum in (b) shows all recorded $\gamma$ events. As one expects, the isomeric transitions 35.1 and 81.1 keV are not present in the $\beta$-gated spectrum. Transitions in ${}^{113}\mathrm{Pd}$ are labeled with their energies in keV.

Figure 14

Staggering in the yrast, negative-parity band of ${}^{109}\mathrm{Pd}$, ${}^{113}\mathrm{Pd}$, ${}^{111}\mathrm{Ru}$, and ${}^{109}\mathrm{Mo}$ nuclei. Star symbols represent staggering for the ${\mathrm{5/2}}^{-}\left[532\right]$ configuration in ${}^{111}\mathrm{Ru}$. The data are taken from Refs. [2, 23, 25] and the present work. See the text for more explanations.

Figure 15

Total angular-momentum alignment, $I_x$, for the negative-parity band in ${}^{113}\mathrm{Pd}$ and the ground-state band in ${}^{112}\mathrm{Pd}$. The data are taken from Ref. [26] and the present work. Lines are drawn to guide the eye. See the text for more explanation.

Figure 16

Staggering in the positive-parity band of ${}^{111}\mathrm{Ru}$ and ${}^{113}\mathrm{Pd}$ nuclei. The data are taken from Ref. [23] and the present work. See the text for more explanations.

Figure 17

Total angular-momentum alignment, $I_x$, for the ground-state bands in ${}^{113}\mathrm{Pd}$ and ${}^{111}\mathrm{Ru}$. The data are taken from Refs. [23, 26, 38] and the present work. Lines are drawn to guide the eye. See the text for more explanation.

Figure 18

Panel (a) shows B(GT) strength distribution for decay of the ${}^{113}\mathrm{Ru}$ ground state to ${}^{113}\mathrm{Rh}$ [15] and panel (b) shows the same for decay of the ${}^{113}\mathrm{Rh}$ ground state to ${}^{113}\mathrm{Pd}$ as found in this work.