Measurement Of The Cross Section Of ((?)_e,e) Scattering In The Energy Range Of 3-8MeV

TEXONO experiment is the cooperation of the scientists from Taiwan and Chinamainland, aiming at study neutrino physics at low energy level. Unlike other low-energy neutrino experiments which mostly employ chemical methods or liquid scin-tillator, TEXONO adopts CsI(Tl) crystals as its detector. For the many advantages ofsolid scintillator, TEXONO is promising to give a better result than before.In the data analysis, the most important issue is to acquire the energy information.Due to the two-end read-out method in TEXONO experiment, energy information needto be reconstructed. To chase better energy resolution, an algorithm is established toimprove the old method. Two-end read-out method can also provide position information of events. In fact, the high density feature of CsI(Tl) keeps external radiationlocated at the two ends of the crystals, which is helpful to reduce background level.²³⁸U and ²³²Th contamination is the important part of TEXONO background. Theircontent may effectively in fluence the final result. Assuming that ²³⁸U and ²³²Th chains arein secular equilibrium, their abundance can then be measured by studying the particlesand timing feature of the two continuous decays. The measured abundance for the twochains is:8.2 ± 0.3 × 10^-13g/g for ²³⁸U and 2.20 ± 0.06 × 10^-12g/g for ²³²Th。In the condition of well shielded, through the measurement of the backgroundspectra of the period of Reactor ON and Reactor OFF, the cross section of anti-electronneutrino electron scattering can be given by "ON-OFF". It is the traditional methodemployed in reactor neutrino experiments, which can avoid the hard measurement ofabsolute background and the related errors. Benefited from the excellent characteristicsof CsI(Tl) crystal, it is promising to reduce the error level down to 25%.