$\beta$-decay half-lives of neutron-rich nuclides in the $A=100–110$ mass region

$\beta$-decay half-lives of neutron-rich nuclides in the $A=100–110$ mass region have been measured using an implantation station installed inside of the Summing NaI(Tl) (SuN) detector at the National Superconducting Cyclotron Laboratory. Accurate half-lives for these nuclides are important for nuclear astrophysics, nuclear structure, and nuclear technology. The half-lives from the present work are compared with previous measurements, showing overall good agreement.

Figure 1

Decay curve for ${}^{99}\mathrm{Y}$. The selection of events in this decay curve is described in Table 1. The inset shows the decay curve on a logarithmic scale.

Figure 2

$\beta$-delayed $\gamma$-ray spectra for decay events correlated to ${}^{101}\mathrm{Zr}$ implantations with a correlation time window of one second. The backward-time correlations (random background) have been subtracted from the forward-time correlations. The top panel, labeled (a), shows the TAS spectrum, and the red, cross hatches indicate the selection of events used to examine the individual $\gamma$ rays in the sum-of-segments spectrum in the bottom panel. The bottom panel, labeled (b), shows the sum-of-segments spectrum only for certain events in the TAS spectrum as indicated in the top panel. Individual $\gamma$ rays identified within the energy resolution of SuN are labeled. In (b), the red cross hatches indicate the selection of events used to create the decay curve for ${}^{101}\mathrm{Zr}$, which is shown in Fig. 3.

Figure 3

Decay curve for ${}^{101}\mathrm{Zr}$. The selection of events in this decay curve is described in Table 1 and shown in Fig. 2. The inset shows the decay curve on a logarithmic scale.

Figure 4

Decay curve for ${}^{102}\mathrm{Zr}$. The selection of events in this decay curve is described in Table 1. The inset shows the decay curve on a logarithmic scale.

Figure 5

Decay curve for ${}^{102m}\mathrm{Nb}$. The selection of events in this decay curve is described in Table 1. The inset shows the decay curve on a logarithmic scale.

Figure 6

Decay curve for ${}^{103}\mathrm{Nb}$. The selection of events in this decay curve is described in Table 1. The inset shows the decay curve on a logarithmic scale.

Figure 7

Decay curve for ${}^{104m}\mathrm{Nb}$. The selection of events in this decay curve is described in Table 1. The inset shows the decay curve on a logarithmic scale.

Figure 8

Decay curve for ${}^{109}\mathrm{Tc}$. The selection of events in this decay curve is described in Table 1. The inset shows the decay curve on a logarithmic scale.