Showing papers on "CHOOZ published in 2006"
Posted Content•
TL;DR: The Double Chooz Reactor Neutrino Experiment in France plans to quickly measure the neutrino mixing angle theta-13, or limit it to sin 2 2theta_13 less than 0.025 as discussed by the authors.
Abstract: The Double Chooz Reactor Neutrino Experiment in France plans to quickly measure the neutrino mixing angle theta-13, or limit it to sin^2 2-theta_13 less than 0.025. The physics reach, experimental site, detector structures, scintillator, photodetection, electronics, calibration and simulations are described. The possibility of using Double Chooz to explore the possible use of a antineutrino detector for non-proliferation goals is also presented.
230 citations
TL;DR: In this article, a modified version of the Gaisser sea-level muon distribution and a well-tested Monte Carlo integration method are introduced to calculate average muon energy, flux, and rate.
Abstract: Muon backgrounds at Super-Kamiokande, KamLAND, and CHOOZ are calculated using $\mathtt{M}\mathtt{U}\mathtt{S}\mathtt{I}\mathtt{C}$. A modified version of the Gaisser sea-level muon distribution and a well-tested Monte Carlo integration method are introduced. Average muon energy, flux, and rate are tabulated. Plots of average energy and angular distributions are given. Implications for muon tracker design in future experiments are discussed.
101 citations
TL;DR: In this paper, the potential of the Double Chooz experiment to measure the neutrino mixing angle sin22θ13 was discussed, and the role of the double chooz experiments in the global context of future neutrinos beam experiments was discussed.
Abstract: We discuss the potential of the proposed Double Chooz reactor experiment to measure the neutrino mixing angle sin22θ13. We especially consider systematical uncertainties and their partial cancellation in a near and far detector operation, and we discuss implications of a delayed near detector startup. Furthermore, we introduce Triple Chooz, which is a possible upgrade scenario assuming a second, larger far detector, which could start data taking in an existing cavern five years after the first far detector. We review the role of the Chooz reactor experiments in the global context of future neutrino beam experiments. We find that both Double Chooz and Triple Chooz can play a leading role in the search for a finite value of sin22θ13. Double Chooz could achieve a sensitivity limit of ~ 2.10−2 at the 90% confidence level after 5 years while the Triple Chooz setup could give a sensitivity below 10−2.
55 citations
01 May 2006
TL;DR: The Angra Project as mentioned in this paper is a neutrino oscillation experiment proposed to be built in Brazil at the Angra dos Reis nuclear reactor complex to measure θ 13, the last unknown of the three mixing angles.
Abstract: We present the status and plans of the Angra Project, a new nuclear reactor neutrino oscillation experiment, proposed to be built in Brazil at the Angra dos Reis nuclear reactor complex. This experiment is aimed to measure θ 13 , the last unknown of the three neutrino mixing angles. Combining a high luminosity design, very low background from cosmic rays and careful control of systematic errors at the 1% level, we propose a high sensitivity multi-detector experiment, able to reach a sensitivity to antineutrino disappearance down to sin 2 2 θ 13 = 0.006 in a three years running period, improving present limits constrained by the CHOOZ experiment by more than an order of magnitude.
31 citations
TL;DR: In this article, only two ansatze can produce the features of neutrino mixing angles, i.e., left-handed neutrinos and leptons, and only one ansatz can be satisfied for the quark-lepton grand unification.
Abstract: We demonstrate that only two ansatze can produce the features of the neutrino mixing angles. The first ansatz comes from the quark-lepton grand unification; νDi = VCKMνα is satisfied for left-handed neutrinos, where νDi ≡ (νD1,νD2,νD3) are the Dirac mass eigenstates and να ≡ (νe,νμ,ντ) are the flavour eigenstates. The second ansatz comes from the assumption; νDi = Ubimaximalνi is satisfied between the Dirac mass eigenstates νDi and the light Majorana neutrino mass eigenstates νi ≡ (ν1,ν2,ν3), where Ubimaximal is the 3 × 3 rotation matrix that contains two maximal mixing angles and a zero mixing. By these two ansatze, the Maki-Nakagawa-Sakata lepton flavour mixing matrix is given by UMNS = VCKM†Ubimaximal. We find that in this model the novel relation θsol + θ13 = π/4 is satisfied, where θsol and θ13 are solar and CHOOZ angle, respectively. This "Solar-CHOOZ Complementarity" relation indicates that only if the CHOOZ angle θ13 is sizable, the solar angle θsol can deviate from the maximal mixing. Our predictions are θsol = 36°, θ13 = 9° and θatm = 45°, which are consistent with experiments. We also infer the CP violation in neutrino oscillations. The leptonic Dirac CP phase δMNS is predicted as sin δMNS Aλ2η, where A,λ,η are the CKM parameters in Wolfenstein parametrization. In contrast to the quark CP phase δCKM (1), the leptonic Dirac CP phase is very small, δMNS 0.8°. Furthermore, we remark that the ratio of the Jarlskog CP violation factor for quarks and leptons is important, because the large uncertainty on η is cancelled out in the ratio, RJ ≡ JCKM/JMNS 4(2)1/2Aλ3 5 × 10−2.
19 citations
[...]
TL;DR: In this article, the status and results of neutrino experiments are reviewed, including short baseline experiments and long baseline oscillation experiments at Chooz and KamLAND, and it is now widely accepted that a new middle baseline experiment with multiple detectors could provide a clean measurement of the last undetermined neutrinos mixing angle theta13
17 citations
TL;DR: In this article, the potential of the Double Chooz experiment to measure the neutrino mixing angle was discussed, and the role of the double chooz experiments in the search for a finite value of the mixing angle is discussed.
Abstract: We discuss the potential of the proposed Double Chooz reactor experiment to measure the neutrino mixing angle $\sin^2 2\theta_{13}$. We especially consider systematical uncertainties and their partial cancellation in a near and far detector operation, and we discuss implications of a delayed near detector startup. Furthermore, we introduce Triple Chooz, which is a possible upgrade scenario assuming a second, larger far detector, which could start data taking in an existing cavern five years after the first far detector. We review the role of the Chooz reactor experiments in the global context of future neutrino beam experiments. We find that both Double Chooz and Triple Chooz can play a leading role in the search for a finite value of $\sin^2 2\theta_{13}$. Double Chooz could achieve a sensitivity limit of $\sim 2 \cdot 10^{-2}$ at the 90%~confidence level after 5~years while the Triple Chooz setup could give a sensitivity below $10^{-2}$.
11 citations
Posted Content•
TL;DR: The Kashiwazaki-kariwa neutrino experiment (KASKA) as mentioned in this paper was proposed to measure the last mixing angle theta_13 with an expected sensitivity of sin 2 2theta-13~0.015.
Abstract: One of the current most-demanded experiments in neutrino physics is to measure the last mixing angle theta_13. KASKA is an experiment to detect new type of reactor neutrino oscillation and to measure sin^2 2theta_13 accurately using the world's most powerful nuclear reactor complex; Kashiwazaki-Kariwa nuclear power station. KASKA utilizes near and far detectors of identical structure at nearly optimized baselines and underground depths to cancel most of the systematics and reduce backgrounds. The expected sensitivity is sin^2 2theta_13~0.015, which is 10 times better sensitivity than the current upper limit measured by CHOOZ reactor experiment. Extension of KASKA project has potential to accurately measure other anti-nu_e oscillation parameters. Intense and precisely known neutrino flux measured by the KASKA-theta_13 phase can be used to pin down sin^2 2theta_12 at a baseline ~50km and to measure Dm^2_13 for the first time at a baseline ~5km. This Letter of Intent describes physics motivation, detector system and expected performance of the KASKA experiment.
9 citations
KEK1
TL;DR: Yuichi et al. as mentioned in this paper reported the results from the K2K experiment and status of the T2k experiment, which is the first long-baseline neutrino oscillation experiment with a distance of several hundred kilometers and using an accelerator-based Neutrino beam.
Abstract: Results from the K2K experiment and status of the T2K experiment are reported. 1. Results from the K2K experiment The K2K experiment[1] is the first long-baseline neutrino oscillation experimentwith a distance of hundred kilometers andusing an acceleratorbased neutrino beam. It started in 1999 and ended in November, 2004. The main purpose of K2K is to confirm muon neutrino oscillation claimed by the Super-Kamiokande experiment[2] using an artificial neutrino beam. Because the details of the experiment are already described in other articles[1, 3], only updated numbers and figures are presented in Table 1. Some comments that were not covered in my previous articles[3] are itemized below: − After the accident of Super-Kamiokande in November, 2001, the total number of PMTs in Super-Kamiokande was reduced to be about one half. The K2K experiment of this period was named K2K-II. In this period, the lead-glass counters of the front detector were replaced by a SciBar detector[1], a fully active fine-grained detector made of 14848 strips of extruded scintillator read out by wavelength-shifting fibers. There is no essential change in the oscillation analysis. − A possible νe appearance signal from νe ↔ νμ oscillation was also searched[4]. From tight e-like event selection, only one candidate remains, where the expected background is 1.63. The expected signal is 1 ∼ 2 events if the parameter region around the CHOOZ limit[5] is assumed. The 90% C.L. upper limit on sin 2θeμ (=12 sin 2 2θ13) is 0.18 for ∆m2 = 2.8× 10−3eV2. This limit has no impact on our present knowledge on the oscillation parameters because of the poor statistics (see Section 3.1). ‡ E-mail address: yuichi.oyama@kek.jp; URL: http://www-nu.kek.jp/ oyama ∗ Talk at International Conference on New Trends in High-Energy Physics (Crimea2005), Yalta, Ukraine, September 10-17, 2005
7 citations
30 Oct 2006
TL;DR: The Double Chooz Reactor Neutrino Experiment in France plans to quickly measure the neutrino mixing angle theta-13, or limit it to sin 2 2theta_13 less than 0.025.
Abstract: The Double Chooz Reactor Neutrino Experiment in France plans to quickly measure the neutrino mixing angle theta-13, or limit it to sin^2 2-theta_13 less than 0.025. The physics reach, experimental site, detector structures, scintillator, photodetection, electronics, calibration and simulations are described. The possibility of using Double Chooz to explore the possible use of a antineutrino detector for non-proliferation goals is also presented.
3 citations
28 Nov 2006
TL;DR: The Double Chooz Experiment (DDE) as mentioned in this paper was the first new information on θ13 in over a decade and will cover most of the remaining parameter space, and it was made possible by the existing neutrino laboratory at the chooz site.
Abstract: There is broad consensus in the worldwide physics community as to the need for a new reactor‐neutrino experiment to measure or limit the neutrino mixing angle θ13. The Double Chooz Experiment, planned for operation in the years 2008–2011, will search for values of sin22θ13 down to ≈0.03. This will be the first new information on θ13 in over a decade and will cover most of the remaining parameter space. A quick and relatively inexpensive project is made possible by the existing neutrino laboratory at the Chooz site.
TL;DR: In this paper, the authors proposed doubling-chooz experiment and showed that by reducing statistical as well as systematical uncertainties, the sensitivity on Θ 13 of new reactor experiments can be improved by one order of magnitude.
TL;DR: In this article, the Bimaximal + Democratic type neutrino mass matrix can accommodate the deviation of θ⊙ from its maximal value along with other present-day neutrinos experimental results, namely, atmospheric, CHOOZ, neutrinoless double beta decay (ββ0ν) and result obtained from WMAP experiment.
Abstract: We demonstrate that "Bimaximal + Democratic" type neutrino mass matrix can accommodate the deviation of θ⊙ from its maximal value along with the other present-day neutrino experimental results, namely, atmospheric, CHOOZ, neutrinoless double beta decay (ββ0ν) and result obtained from WMAP experiment. We define a function χp in terms of solar and atmospheric neutrino mass squared differences and solar neutrino mixing angle (obtained from different experiments and our proposed texture). The masses and mixing angles are expressed in terms of three parameters in our proposed texture. The allowed region of the texture parameters is obtained through minimization of the above function. The proposed texture crucially depends on the value of the experimental results of ββ0ν experiment among all other above-mentioned experiments. If, in future, ββ0ν experiments, namely, MOON, EXO, GENIUS shift the lower bound on 〈mee〉 at the higher side by one order, the present texture will be ruled out.
TL;DR: In this paper, the consequences of texture zero at the entry of neutrino mass matrix in the flavor basis, which also implies a vanishing effective Majorana mass for neutrinoless double beta decay, have been studied for Majorana neutrinos.
Abstract: The consequences of a texture zero at the $ee$ entry of neutrino mass matrix in the flavor basis, which also implies a vanishing effective Majorana mass for neutrinoless double beta decay, have been studied for Majorana neutrinos. The neutrino parameter space under this condition has been constrained in the light of all available neutrino data including the CHOOZ bound on $s_{13}^{2}$.
01 May 2006
TL;DR: The Double Chooz θ 13 experiment is described in this paper, which is an optimized reactor disappearance experiment similar to the original CHOOZ that includes an increase in the signal to noise by increasing the target volume and reducing single background with a non-scintillating oil buffer region around the target.
Abstract: The proposed Double Chooz θ 13 experiment is described. Double Chooz will be an optimized reactor disappearance experiment similar to the original CHOOZ. The optimization includes an increase in the signal to noise by increasing the target volume to twice the original CHOOZ, reducing singles background with a non-scintillating oil buffer region around the target and carefully controlling systematic uncertainties by measuring the ν ¯ e flux of the source with a near detector. The Double Chooz far detector will be situated in the same cavern as CHOOZ but will detect ∼ 50000 ν ¯ e s in three years of operation. We estimate a systematic uncertainty of 0.6%, and a sin 2 ( 2 θ 13 ) to 0.03.
TL;DR: The Double Chooz experiment as mentioned in this paper uses two identical detectors placed at a distance of 150 m and 1.05 km from the reactor cores to achieve a sensitivity of a percent.
Abstract: The goal of the Double Chooz experiment is to measure the value of sin2(2ϑ13), which is of great interest at the moment in neutrino physics. To overcome the existing limit coming from the CHOOZ experiment, we are going to use two identical detectors that will be placed at a distance of 150 m and 1.05 km from the reactor cores. This setup will allow us to decrease systematic error down to the level of a percent. In this paper, we discuss the details of the proposed experiment and the ways in which we plan to achieve the announced sensitivity.
TL;DR: A review of neutrino physics can be found in this article, where the authors show that neutrinos have the remarkable phenomena of oscillations, a quantum interference mechanism that operates to distances as large as 100 km and even bigger distances.
Abstract: In the last years, we experienced a complete change of the view of weak interaction physics. Robust results from many experiments as Super-Kamiokande, KamLAND, SNO, K2K, show us that the neutrinos have the remarkable phenomena of oscillations, a quantum interference mechanism that operates to distances as large as 100 km and even bigger distances. From this we know that neutrinos change identity from one flavor to another, as was demonstrated by the joints results of SNO and Super-Kamiokande experiments. We show here the review of latest results of neutrino physics, as for example, the first evidence of neutrinos produced in the core of the earth and the updated results of KamLAND and others. Our understating of all experimental results will completed by the state-of-art of the theoretical effort to understand such phenomena. For the near future, we expect the new generation of precision physics, like the running experiments of MINOS and Double CHOOZ, and the proposals of SADO and ANGRA shed light on unresolved issues such as the CP-violation for neutrinos and the relative magnitude of solar and atmospheric scales.