Indication for the disappearance of reactor electron antineutrinos in the Double Chooz experiment

The Double Chooz Experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. A ratio of 0.944 $\pm$ 0.016 (stat) $\pm$ 0.040 (syst) observed to predicted events was obtained in 101 days of running at the Chooz Nuclear Power Plant in France, with two 4.25 GW$_{th}$ reactors. The results were obtained from a single 10 m$^3$ fiducial volume detector located 1050 m from the two reactor cores. The reactor antineutrino flux prediction used the Bugey4 measurement as an anchor point. The deficit can be interpreted as an indication of a non-zero value of the still unmeasured neutrino mixing parameter \sang. Analyzing both the rate of the prompt positrons and their energy spectrum we find \sang = 0.086 $\pm$ 0.041 (stat) $\pm$ 0.030 (syst), or, at 90% CL, 0.015 $<$ \sang $\ <$ 0.16.Comment: 7 pages, 4 figures, (new version after PRL referee's comments

First test of Lorentz violation with a reactor-based antineutrino experiment

We present a search for Lorentz violation with 8249 candidate electron antineutrino events taken by the Double Chooz experiment in 227.9 live days of running. This analysis, featuring a search for a sidereal time dependence of the events, is the first test of Lorentz invariance using a reactor-based antineutrino source. No sidereal variation is present in the data and the disappearance results are consistent with sidereal time independent oscillations. Under the Standard-Model Extension, we set the first limits on 14 Lorentz violating coefficients associated with transitions between electron and tau flavor, and set two competitive limits associated with transitions between electron and muon flavor

First measurement of θ<inf>13</inf> from delayed neutron capture on hydrogen in the Double Chooz experiment

The Double Chooz experiment has determined the value of the neutrino oscillation parameter θ13 from an analysis of inverse beta decay interactions with neutron capture on hydrogen. This analysis uses a three times larger fiducial volume than the standard Double Chooz assessment, which is restricted to a region doped with gadolinium (Gd), yielding an exposure of 113.1 GW-ton-years. The data sample used in this analysis is distinct from that of the Gd analysis, and the systematic uncertainties are also largely independent, with some exceptions, such as the reactor neutrino flux prediction. A combined rate- and energy-dependent fit finds sin22θ13=0.097±0.034 (stat.)±0.034 (syst.), excluding the no-oscillation hypothesis at 2.0. This result is consistent with previous measurements of sin22θ13

First measurement of ?13 from delayed neutron capture on hydrogen in the Double Chooz experiment

The Double Chooz experiment has determined the value of the neutrino oscillation parameter ?13 from an analysis of inverse beta decay interactions with neutron capture on hydrogen. This analysis uses a three times larger fiducial volume than the standard Double Chooz assessment, which is restricted to a region doped with gadolinium (Gd), yielding an exposure of 113.1 GW-ton-years. The data sample used in this analysis is distinct from that of the Gd analysis, and the systematic uncertainties are also largely independent, with some exceptions, such as the reactor neutrino flux prediction. A combined rate- and energy-dependent fit finds sin22?13=0.097±0.034 (stat.)±0.034 (syst.), excluding the no-oscillation hypothesis at 2.0. This result is consistent with previous measurements of sin22?13

Reactor ? ¯e disappearance in the Double Chooz experiment

The Double Chooz experiment has observed 8249 candidate electron antineutrino events in 227.93 live days with 33.71GW-ton-years (reactor power×detector mass×live time) exposure using a 10.3m3 fiducial volume detector located at 1050m from the reactor cores of the Chooz nuclear power plant in France. The expectation in case of ? 13=0 is 8937 events. The deficit is interpreted as evidence of electron antineutrino disappearance. From a rate plus spectral shape analysis we find sin22? 13=0.109±0.030(stat)±0.025(syst) . The data exclude the no-oscillation hypothesis at 99.8%CL (2.9s)

First Test of Lorentz Violation with a Reactor-based Antineutrino Experiment

We present a search for Lorentz violation with 8249 candidate electron antineutrino events taken by the Double Chooz experiment in 227.9 live days of running. This analysis, featuring a search for a sidereal time dependence of the events, is the first test of Lorentz invariance using a reactor-based antineutrino source. No sidereal variation is present in the data and the disappearance results are consistent with sidereal time independent oscillations. Under the Standard-Model Extension (SME), we set the first limits on fourteen Lorentz violating coefficients associated with transitions between electron and tau flavor, and set two competitive limits associated with transitions between electron and muon flavor

Failure of "Myth of Homeland": delay of return migration to Albania

EnAlbania is the country with the highest migration flow in Europe with a multifaceted Diaspora. The increasing flows of asylum-seekers during the last three years have re-brought Albanian migration to the attention of international and European context. The Albanians "economic asylum seekers" were labor emigrants who were self-nominated so in order to incentivize their accommodation and a tactic to be admitted in Germany and other EU member countries. The almost three decade's experience of Albanians' migration shows that some of the myths which inspired, encouraged and pushed Albanians to leave their country after 1990 failed to be realized. Most of people who emigrated to Greece, Italy and other Western countries were motivated by their desires to ensure a better education for their children. Three decades later, the gap between expectations of the parents and education of their children is visible. Employment, rather than education, seems to be the life path of Albanian migrants second generation. The myth of children education remained only a myth. Albania experienced a delay in the return of successful emigrants. Return migration first became significant in 2005 and the increase in returned migrants started to be a trend of Albanian migration after 2008. However, the ideology of return has mostly been the ideology of failure. The domination of failure was explicable in the conditions of the illegal emigration, during the first decade of Albania's contemporary migration. After 1999, as the immigration legislation of Italy and Greece became more liberal and favorable, the rhythms of forced return started to decrease. The recent trend to revert to the ideology of success is also related with some positive features of the migration of Albanians and the collapse of the so-called "myths" about their emigration: the replacement of myth of demon and criminal by the myth of neighbor; the replacement of the myth of usurper of the jobs of the natives by the myth of competitor; and the replacement of the myth of burden on welfare system by the myth of sponsor of the system, as the Albanian emigrants contribute to the receiving countries as tax payers.L'Albania è il paese con il più alto flusso migratorio in Europa e con una diaspora poliedrica. I crescenti flussi di richiedenti asilo negli ultimi tre anni hanno riportato la migrazione albanese all'attenzione del contesto internazionale ed europeo della migrazione. Gli albanesi «richiedenti asilo economico» si sono tatticamente autodefiniti emigranti per motivi di lavoro con lo scopo di incentivare la loro accettazione in Germania e in altri paesi dell'UE. L'esperienza quasi trentennale della migrazione degli albanesi dimostra che alcuni dei miti che hanno ispirato, incoraggiato e spinto gli albanesi a lasciare il loro paese dopo il 1990 non sono stati realizzati. La maggior parte delle persone emigrate in Grecia, Italia e altri paesi occidentali erano motivate dal desiderio di garantire una migliore istruzione ai propri figli. Tre decenni dopo, la distanza tra le aspettative dei genitori e l'educazione dei loro figli è visibile. L'occupazione, piuttosto che l'istruzione, sembra essere il percorso di vita dei migranti albanesi di seconda generazione. Il mito dell'educazione dei bambini è rimasto solo un mito. L'Albania ha subito un ritardo nel ritorno degli emigrati di successo. La migrazione di ritorno è diventata inizialmente significativa nel 2005 e l'aumento dei migranti di ritorno ha iniziato a essere una tendenza della migrazione albanese dopo il 2008. Tuttavia, l'ideologia del ritorno è stata principalmente l'ideologia del fallimento. La spiegazione di un dominante fallimento si trova nelle condizioni dell'emigrazione illegale, durante il primo decennio della migrazione albanese contemporanea. Dopo il 1999, quando le legislazioni italiana e greca sull'immigrazione hanno assunto caratteri più favorevoli e liberali, i ritmi del ritorno forzato iniziarono a diminuire. La tendenza recente a tornare all'ideologia del successo è anche legata ad alcune caratteristiche positive della migrazione degli albanesi e al crollo dei cosiddetti "miti" sulla loro emigrazione: la sostituzione del mito del demone e del criminale con il mito del vicino; la sostituzione del mito dell'usurpatore dei lavori dei nativi con il mito del concorrente; infine, la sostituzione del mito dell'onere sul sistema di welfare con il mito dello sponsor del sistema, poiché gli emigranti albanesi diventano contribuenti dei sistemi fiscali dei paesi in cui si trasferiscono

Reactor ν̅ [subscript e] disappearance in the Double Chooz experiment

The Double Chooz experiment has observed 8249 candidate electron antineutrino events in 227.93 live days with 33.71 GW-ton-years (reactor power×detector mass×live time) exposure using a 10.3  m[superscript 3] fiducial volume detector located at 1050 m from the reactor cores of the Chooz nuclear power plant in France. The expectation in case of θ[subscript 13]=0 is 8937 events. The deficit is interpreted as evidence of electron antineutrino disappearance. From a rate plus spectral shape analysis we find sin[superscript 2]2θ[subscript 13]=0.109±0.030(stat)±0.025(syst). The data exclude the no-oscillation hypothesis at 99.8% CL (2.9σ)

First Test of Lorentz Violation with a Reactor-based Antineutrino Experiment

see paper for full list of authors ; 6 pages, 2 figures; (new version after referee's comments)We present a search for Lorentz violation with 8249 candidate electron antineutrino events taken by the Double Chooz experiment in 227.9 live days of running. This analysis, featuring a search for a sidereal time dependence of the events, is the first test of Lorentz invariance using a reactor-based antineutrino source. No sidereal variation is present in the data and the disappearance results are consistent with sidereal time independent oscillations. Under the Standard-Model Extension (SME), we set the first limits on fourteen Lorentz violating coefficients associated with transitions between electron and tau flavor, and set two competitive limits associated with transitions between electron and muon flavor