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# DPF2015

4-8 August 2015
America/Detroit timezone

## Cosmogenic isotope production by stopping muons in Double Chooz

5 Aug 2015, 17:40
20m
Hussey (Michigan League)

### Hussey

#### Michigan League

Neutrino Experiment

### Speaker

Matthew Strait (University of Chicago)

### Description

Using the Double Chooz reactor neutrino detector, we have measured the products of $\mu^-$ capture on ${}^{12}$C, ${}^{13}$C, ${}^{14}$N and ${}^{16}$O. Over a period of 490 days, we collected $2.3\times10^6$ stopping cosmic $\mu^-$, of which $1.8\times10^5$ captured on these nuclei in the inner detector scintillator or acrylic vessels. The resulting isotopes were tagged using prompt neutron emission (when applicable), the subsequent beta decays, and, in some cases, $\beta$-delayed neutrons. Production of these $\beta$n isotopes, primarily ${}^9$Li, which are $\bar\nu_\mathrm{e}$ backgrounds, was found at a significance of 5.0$\sigma$. The probability of ${}^9$Li per capture on ${}^{\mathrm{nat}}$C is $(2.4\pm0.9\mathrm{(stat)}\pm0.1\mathrm{(syst)})\times10^{-4}$.
Oral or Poster Presentation Oral

### Primary author

Matthew Strait (University of Chicago)