1999/05/31 by John N. Bahcall, J. N. Bahcall, P. I. Krastev +1 · 99 citations
Physics and Astronomy · #Astrophysics #Astrophysics and Cosmic Phenomena #Asymmetry #Atmospheric sciences #Dark Matter and Cosmic Phenomena #Distortion (music) #Energy (signal processing) #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Optics #Particle physics #Physics #Recoil #Solar neutrino #Solar neutrino problem #Solar zenith angle #Zenith #astro-ph #hep-ex #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevd.60.093001
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 60(9) (American Physical Society) · Added Fig. 1 showing LMA allowed region. Editorial changes. Accepted Phys Rev D. Related information: http://www.sns.ias.edu/~jnb
arxiv created 1999/10/02 · openalex publication_date 1999/10/04 · openalex created_date 2016/06/24 · arxiv updated 2016/08/24 · openalex updated_date 2026/08/05
Recent results on solar neutrinos provide hints that the LMA MSW solution could be correct. We perform accurate calculations for potential ``smoking-gun'' effects of the LMA solution in the SuperKamiokande solar neutrino experiment, including (1) an almost constant reduction of the standard recoil electron energy spectrum (with a weak, 10%, relative increase below 6.5 MeV), (2) an integrated difference in day-night rates (2%--14%), (3) an approximately constant zenith-angle dependence of the nighttime event rate, (4) a new test for the difference in the shape of the equally normalized day-night energy spectra (\ensuremath∼1%), and (5) annual variations of the signal due to the regeneration effect (\ensuremath∼6 times smaller than the integrated day-night effect). We also establish a relation between the integrated day-night asymmetry and the seasonal asymmetry due to LMA regeneration. As a cautionary example, we simulate the effect of an absolute energy calibration error on the shape (distortion) of the recoil energy spectrum. We compare LMA predictions with the available SuperKamiokande data for 708 days of operation and discuss the possibilities for distinguishing experimentally between LMA and vacuum oscillations. If LMA is correct, global solutions combining data from different types of measurements made by SuperKamiokande or by different solar neutrino experiments could reveal in the next few years a many \ensuremathσ indication of neutrino oscillations.