Negative parity bands of ${}^{115}\mathrm{Pd}$ and band structures in ${}^{113,115,117}\mathrm{Pd}$

Level structures of ${}^{113,115,117}\mathrm{Pd}$ have been studied using the Gammasphere and a spontaneous fission source of ${}^{252}\mathrm{Cf}$. A new 85.1-keV transition was identified in ${}^{113}\mathrm{Pd}$. This indicates that the spin and parity of the isomeric state is 9/2${}^{-}$ rather than the previously assigned ${11/2}^{-}$. New low-energy transitions are confirmed in ${}^{115,117}\mathrm{Pd}$. In ${}^{115}\mathrm{Pd}$, the 39.0.- and 49.0-keV transitions are shown to be in prompt coincidence. This coincidence relationship indicates a spin and parity assignment of ${1/2}^{+}$ for the ground state rather than the previously assigned ${3/2}^{+}$.

Figure 1

Previous negative parity levels in ${}^{107,109,111,113,115,117}\mathrm{Pd}$.

Figure 2

Top spectrum shows double gate on 440.0- and 766.7-keV transitions in ${}^{117}\mathrm{Pd}$ and new 63.7-keV transition. Bottom spectrum shows double gate on 440.0-keV and new 63.7-keV transitions and other transitions in the ${}^{117}\mathrm{Pd}$ cascade.

Figure 3

Top spectrum shows double gate on 383.1- and 570.5-keV transitions in ${}^{113}\mathrm{Pd}$ and new 85.1-keV transition. Bottom spectrum shows double gate on 395.8- and 580.0-keV transitions in ${}^{115}\mathrm{Pd}$ and new 39.0- and 49.0-keV transitions.

Figure 4

New level scheme of ${}^{117}\mathrm{Pd}$. New transitions are marked with an asterisk.

Figure 5

New level scheme of ${}^{115}\mathrm{Pd}$. New transitions are marked with an asterisk. Also shown are the low spin levels from Urban et al. [12].

Figure 6

Double gate on 49.0- and 395.0-keV transitions in ${}^{115}\mathrm{Pd}$ showing coincidence relation between the 39.0- and 49.0-keV transitions. Observed full widths at half maximum of the peaks are 1.8(3) keV for the 39.0-keV peak, 2.3(1) for the 115.4-keV peak, and 2.5(1) for the 580.0-keV peak. The energy dispersion is 0.333333 keV per channel.

Figure 7

Top spectrum shows double gate on 49.0- and 39.0-keV transitions in ${}^{115}\mathrm{Pd}$ and coincidence relation. Bottom spectrum shows a background gate on 39.0- and 45.0-keV transitions and no coincidence with the rotational band.

Figure 8

New level scheme of ${}^{113}\mathrm{Pd}$. New transitions are marked with an asterisk.

Figure 9

New negative parity level systematics in ${}^{107,109,111,113,115,117}\mathrm{Pd}$.

Figure 10

New high-spin side band level systematics in ${}^{113,115,117}\mathrm{Pd}$ (bold). Selected levels in the rotational bands are shown as well.