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The pseudo-experimental spectrum is t to simulated spectra for dierent lifetimes. In order to get the lifetime, χ 2 of each t is shown over the simulated lifetime and t with a polynomial of the second order. The minimum of the t gives the lifetime. For the example in Fig. 2, the deduced lifetime with this method is τ = 6.49 ± 0.08 ps. The plot is taken from [3].

The pseudo-experimental spectrum is t to simulated spectra for dierent lifetimes. In order to get the lifetime, χ 2 of each t is shown over the simulated lifetime and t with a polynomial of the second order. The minimum of the t gives the lifetime. For the example in Fig. 2, the deduced lifetime with this method is τ = 6.49 ± 0.08 ps. The plot is taken from [3].

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Figure 1: Level scheme of 26 O following [5]. The decay of the 2n...
Figure 2: Simulated velocity-dierence spectrum for a lifetime of 6.5 ps...
Figure 3: The pseudo-experimental spectrum is t to simulated spectra...
Figure 4: Simulated velocity-dierence spectrum for a lifetime of 1.5 ps...
Figure 5: The target used in the experiment is a combination of six...
Lifetime measurement of the 26 0 g.s. at SAMURAI
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  • Dec 2020
The ground state of the neutron unbound nucleus ²⁶ O is speculated to have a lifetime in the pico-second regime. In order to determine the decay lifetime of the ²⁶ O ground state with high sensitivity and precision, a new method has been applied. The experiment was performed in December 2016 at the Superconducting Analyzer for MUlti-particle from R...
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... idea is to compare the experimental spectrum with simulated spectra. The simulations will be performed for several lifetimes and then t to the experimental spectrum. Reference [3] shows a simulation example for τ = 6.5 ps, depicted in Fig. 2. From the unnormalized χ 2 distribution, the lifetime can be extracted (smallest χ 2 ), see Fig. 3. The determined lifetime from the χ 2 was τ = 6.49 ± 0.08 ps ...