Speaker
Description
The Impurity Components in the 7Be Solar
Neutrino Flux
Romanov Yu.I.
Kosygin Russian State University, Moscow, Russia
E-mail: romanov.yu.i@mail.ru
In the present work, a development [1], the flavor structure of the 7Be
solar neutrino (SN) flux is investigated.
The electron spectrum of the (v_e ) ̅e-scattering differs from the fairly flat
spectra of all neutrinos. Such difference will open the way for the Borexino
Collaboration to search for an antineutrino admixture in the SN flux [2].
If the part of this flux transforms into neutrinos of the second and third
generations and related antiparticles v ̅e, the total electroweak spectrum of recoil electrons can be written in the form:
(dσ/dT)tot= P(v_e ) (dσ(vee))/dT +P_(v_(μ,τ) ) (dσ(v_(μ,τ) e))/dT +P_(¯v_e ) (dσ( v ̅ee))/dT , (1)
where T is the kinetic energy of the final electron.
The table
P_(¯v_e ) (dσ/dT)tot
0 [0.28; 0.36]
0.05 [0.27; 0.39]
0.1 [0.27; 0.41]
0.2 [0.26; 0.46]
0.3 [0.25; 0.51]
shows the results of calculations based on the Borexino data: a limit of the conversion probability P(v_e→v ̅e ) < 0.35 (90% C.L.) for 862 keV 7Be neutrinos [2], under the assumption of v_e transition to other active neutrino flavors, the SN survival probability P(v_e )= 0.51 ± 0.07 [3].
Each spectrum is presented by ten values of the differential cross sections, corresponding to the recoil electron kinetic energy for the kinematically allowed escape angles, determined by the segment [0°; 90°].
The graphical image of these spectra is presented in the form of figures.
- Yu.I. Romanov // Bull.RAS. Phys. 2015. V. 79. P. 945.
- G. Bellini et al. (Borexino Collaboration) // Phys. Lett. B. 2011. V.696. P.191.
- G. Bellini et al. (Borexino Collaboration) // Phys. Rev. Lett. 2011. V.107. P.141302.
