Conserved vector current test using low energy beta beams

Abstract

We discuss the possibility of testing the weak currents and, in particular, the weak magnetism term through the measurement of the νe + p → e + + n reaction at a low energy beta-beam facility. We analyze the sensitivity using both the total number of events and the angular distribution of the positrons emitted in a waterČerenkov detector. We show that the weak magnetism form factor might be determined with better than several percent accuracy using the angular distribution. This offers a new way of testing the Conserved Vector Current hypothesis.

Neutrino beams as a probe of the nuclear isospin and spin–isospin excitations

“…The idea of establishing a low energy beta-beam facility has been first proposed in [36]. Its potential has been discussed in [36,37,38] for nuclear structure studies, in [36,39] for core-collapse supernova physics, and in [40,8,41,42,43,44] for the study of fundamental interactions. (For a review on the low, medium and high energy scenarios as well as their physics potential see [45]).…”

Low-energy neutrinos at off-axis from a standard beta beam

“…The disposal of a devoted storage ring would probably be the ideal tool for low-energy neutrino physics [12]. The potential of such a facility has been stressed in several papers [9,13,14,16,17,18,19,20]. In Table I, we summarize the characteristics of the corresponding fluxes for the case of antineutrinos 1 resulting from the decay of γ = 7 and γ = 14 6 He ions.…”

“…From the practical point of view, the proposed idea presents several attractive features. First it would not require a devoted storage ring as discussed in previous works [9,12,13,16,17,18,19,20]. Second, specific beamtime would not be needed since one would exploit the neutrino beams planned for CP violation studies.…”

“…We consider a cylindrical detector with r = 4.5 m (radius) and h = 15 m (depth), placed 10 m from the end of the straight section, as done in Refs. [16,17]. TABLE I: Average energy, energy dispersion Γ(E) = (˙E 2¸− E 2 ) 1/2 , peak-energy evaluated at e Ψmax and peak-flux (/10 9 ) at a cylindrical detector placed 10 m away from a low-energy beta-beam running 6 He ions at γ = 7 and γ = 14.…”

“…[9] yield pure beams of electron neutrinos or antineutrinos produced through the decay of radioactive ions circulating in a storage ring [10,11]. Several applications utilizing low-energy beta-beams have been discussed in the literature concerning neutrino-nucleus scattering [12,13,14], electroweak tests of the Standard Model [15,16,17,18,19], as well as core-collapse supernova physics [9,20].…”