Effects of the density-dependent weak form factors on the neutrino reaction via neutral current for the nucleon in nuclear matter and12C

Abstract

Effects of the density-dependent weak form factors on the neutrino reaction via neutral current for the nucleon in nuclear matter and ¹²C Physical Review C, 2013; 87(6) 3. The right to use all or part of the Article, including the APS-prepared version without revision or modification, on the author(s)' web home page or employer's website and to make copies of all or part of the Article, including the APS-prepared version without revision or modification, for the author(s)' and/or the employer's use for educational or research purposes.": February 2014PHYSICAL REVIEW C 87, 065502 (2013) Effects of the density-dependent weak form factors on the neutrino reaction via neutral current for the nucleon in nuclear matter and 12 C The nucleon form factors in free space are usually thought to be modified when a nucleon is bound in a nucleus or immersed in a nuclear medium. We investigate effects of the density-dependent axial and weak-vector form factors on the electroneutrino (ν e ) and anti-electroneutrino (ν e ) reactions with incident energy E ν 80 MeV via neutral current (NC) for a nucleon in a nuclear medium or 12 C. For the density-dependent form factors, we exploit the quark-meson-coupling (QMC) model, and apply them to the ν e andν e induced reactions by NC. About 12% decrease of the total cross section by the ν e reaction on the nucleon is obtained at normal density, ρ = ρ 0 ∼ 0.15 fm −3 , as well as about 18% reduction of the total ν e cross section on 12 C, by the modification of the weak form factors of the bound nucleon. However, similarly to the charged current reaction, effects of the nucleon property change in theν e reaction reduce significantly the cross sections about 30% for the nucleon in matter and 12 C cases. Such a large asymmetry in theν e cross sections is addressed to originate from the different helicities ofν e and ν e .

Effects of neutrino magnetic moment and charge radius constraints and medium modifications of the nucleon form factors on the neutrino mean free path in dense matter

“…[89][90][91][92][93][94][95][96][97]. In the earlier works of neutrino-nucleus interaction [98,99], the in-medium modifications of only the nucleon weak form factors were applied, but both effects of the in-medium weak and EM form factors were studied in Refs. [37,38].…”

Impact of medium modification of the nucleon weak and electromagnetic form factors on the neutrino mean free path in dense matter

“…In the earlier works of neutrino-nucleus interaction of Refs. [25,26], the in-medium modification of the nucleon weak form factors was applied, but the effect of the in-medium EM form factors is yet to be explored. Certainly, one can expect that the in-medium nucleon EM form factors can influence the beta equilibrated matter composition as well as the neutrino-matter scattering cross sections.…”

“…In previous studies of neutrino-nucleus scattering in Refs. [25,26], the authors, including one of us, estimated the (anti)-neutrino-nucleus scattering cross sections via charged [25] and neutral [26] currents for a bound nucleon by including the effect of the in-medium modified weak-magnetism and axial-vector form factors, F W 2 (q 2 ) and G A (q 2 ), respectively, where q is the transferred fourmomentum. (See e.g., Ref.…”

“…[27] for a recent review on theoretical studies of neutrino-nucleus interactions.) They found that the in-medium modified nucleon form factors F W 2 (q 2 ) and G A (q 2 ) as a total effect could reduce the total cross sections of neutrino-nucleus scattering by ∼ 8% [25] and 12-18% [26], respectively. Motivated by these results, we address the role of the in-medium modified nucleon EM form factors in the present work by focusing on the impact of the medium modifications of both the weak and EM form factors of the nucleon in dense matter on the neutrino scattering with nucleons.…”

In-medium effect with muon-neutrino and anti-muon-neutrino quasi-elastic scattering from12C nucleons

“…Our recent calculations [41,42] showed that differential cross sections for the neutrinoinduced reaction in 12 C by an ν E of less than 100 MeV may be altered by about 20-30% by the in-medium effect. In these calculations, we exploited the density-dependent weak form factors estimated in the quark-meson-coupling (QMC) model [43][44][45][46], which has been successfully applied in studying the properties of hadrons in nuclear matter, finite nuclei, and hypernuclei [47][48][49].…”