We present new constraints on the neutrino oscillation parameters ∆m 2 21 , θ12, and θ13 from a three-flavor analysis of solar and KamLAND data. The KamLAND data set includes data acquired following a radiopurity upgrade and amounts to a total exposure of 3.49 × 10 32 target-proton-year. Under the assumption of CPT invariance, a two-flavor analysis (θ13 = 0) of the KamLAND and solar data yields the best-fit values tan 2 θ12 = 0.444 −0.016 . This θ13 interval is consistent with other recent work combining the CHOOZ, atmospheric and long-baseline accelerator experiments. We also present a new global θ13 analysis, incorporating the CHOOZ, atmospheric and accelerator data, which indicates sin 2 θ13 = 0.009 +0.013 −0.007 . A nonzero value is suggested, but only at the 79% C.L.

Transparent Si nanosheets with a thickness of 0.37 nm are produced by chemically exfoliating calcium disilicide with propylamine hydrochloride (PA⋅HCl; see picture, Ca white, Si red). The nanosheets have a two‐dimensional silicon backbone and are an order of magnitude thinner than previously reported silicon nanostructures.

We present the results of a search for extraterrestrial electron antineutrinos (ν e 's) in the energy range 8.3 MeV < E ν e < 31.8 MeV using the KamLAND detector. In an exposure of 4.53 kton-year, we identify 25 candidate events. All of the candidate events can be attributed to background, most importantly neutral current atmospheric neutrino interactions, setting an upper limit on the probability of 8 B solar ν e 's converting into ν e 's at 5.3 × 10 −5 (90% CL), if we assume an undistorted ν e shape. This limit corresponds to a solar ν e flux of 93 cmor an event rate of 1.6 events (kton-year) −1 above the energy threshold (E ν e 8.3 MeV). The present data also allows us to set more stringent limits on the diffuse supernova neutrino flux and on the annihilation rates for light dark matter particles.

Transparente Si‐Nanoschichten mit einer Dicke von 0.37 nm wurden durch chemische Schichtkorrosion von Calciumdisilicid mit Propylamin‐hydrochlorid (PA⋅HCl) erzeugt (siehe Bild, Ca weiß, Si rot). Die Nanoschichten haben ein zweidimensionales Siliciumrückgrat und sind eine Größenordnung dünner als bisher bekannte Siliciumnanostrukturen.

No abstract