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- W2234266062 abstract "The half-lives of ${mathrm{N}}^{12}$ and ${mathrm{B}}^{12}$ have been measured with high precision because of recent interest in the spectrum shape of these two beta emitters. The ${mathrm{N}}^{12}$ and ${mathrm{B}}^{12}$ activities were made in the reactions ${mathrm{B}}^{10}({mathrm{He}}^{3}, n){mathrm{N}}^{12}$ and ${mathrm{B}}^{11}(d, p){mathrm{B}}^{12}$ by bombarding boron targets with ${mathrm{He}}^{3}$ ions and deuterons. The beam was obtained from the 3-MeV electrostatic accelerator at the Kellogg Radiation Laboratory, and was pulsed on for 20 msec and off for 180 msec. During the beam-off period, the counts from the ${mathrm{N}}^{12}$ or ${mathrm{B}}^{12}$ activity were recorded as a function of time using a 400-channel time interval analyzer. The measured values for the half-lives are ${t}_{frac{1}{2}}({mathrm{N}}^{12})=10.95ifmmodepmelsetextpmfi{}0.05$ msec and ${t}_{frac{1}{2}}({mathrm{B}}^{12})=20.3ifmmodepmelsetextpmfi{}0.1$ msec. Using these values, the $mathrm{ft}$ values for the decays of ${mathrm{N}}^{12}$ and ${mathrm{B}}^{12}$ to the ground state of ${mathrm{C}}^{12}$ are $ft({mathrm{N}}^{12})=(1.33ifmmodepmelsetextpmfi{}0.027)ifmmodetimeselsetexttimesfi{}{10}^{4}$ and $ft({mathrm{B}}^{12})=(1.17ifmmodepmelsetextpmfi{}0.012)ifmmodetimeselsetexttimesfi{}{10}^{4}$. The uncertainties quoted for the $mathrm{ft}$ values include the uncertainties in the branching ratios and end-point energies for the two decays." @default.
- W2234266062 created "2016-06-24" @default.
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- W2234266062 date "1963-06-15" @default.
- W2234266062 modified "2023-09-24" @default.
- W2234266062 title "Half-Lives ofN12andB12" @default.
- W2234266062 cites W2599054524 @default.
- W2234266062 doi "https://doi.org/10.1103/physrev.130.2388" @default.
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