Neutron radius determination of 133Cs and its impact on the interpretation of CEvNS-CsI measurement
arxiv(2024)
摘要
Proton-^133Cs elastic scattering at low momentum transfer is performed
using an in-ring reaction technique at the Cooler Storage Ring at the Heavy Ion
Research Facility in Lanzhou. Recoil protons from the elastic collisions
between the internal H_2-gas target and the circulating ^133Cs ions at
199.4 MeV/u are detected by a silicon-strip detector. The matter radius of
^133Cs is deduced by describing the measured differential cross sections
using the Glauber model. Employing the adopted proton distribution radius, a
point-neutron radius of 4.86(21) fm for ^133Cs is obtained. With the newly
determined neutron radius, the weak mixing angle sin^2 θ_W is
independently extracted to be 0.227(28) by fitting the coherent elastic
neutrino-nucleus scattering data. Our work limits the sin^2 θ_W value in
a range smaller than the ones proposed by the previous independent approaches,
and would play an important role in searching new physics via the high
precision CEνNS-CsI cross section data in the near future.
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