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Abstract:
The SNO$$+$$
+
collaboration reports its first spectral analysis of long-baseline reactor antineutrino oscillation using 114 tonne-years of data. Fitting the neutrino oscillation probability to the observed energy spectrum yields constraints on the neutrino mass-squared difference $$\Delta m^2_{21}$$
Δ
m
21
2
. In the ranges allowed by previous measurements, the best-fit $$\Delta m^2_{21}$$
Δ
m
21
2
is ($$8.85^{+1.10}_{-1.33}$$
8
.
85
-
1.33
+
1.10
) $$\times $$
×
$$10^{-5}$$
10
-
5
$$\hbox {eV}^2$$
eV
2
. This measurement is continuing in the next phases of SNO+ and is expected to surpass the present global precision on $$\Delta m^2_{21}$$
Δ
m
21
2
with about three years of data.
