Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow/><mml:mn>8</mml:mn></mml:msup></mml:math>B solar neutrino flux with the KamLAND liquid scintillator detector

Abe, S.; Furuno, K.; Gando, A.; Gando, Y.; Ichimura, Kunihiro; Ikeda, H.; Inoue, K.; Kibe, Y.; Kimura, Wasaburo; Kishimoto, Y.; Koga, M.; Minekawa, Y.; Mitsui, Tadao; Morikawa, Toshio; Nagai, N.; Nakajima, K.; Nakamura, Kenzo; Nakamura, Masahiro; Narita, Kentaro; Shimizu, I.; Shimizu, Yasuhiro; Shirai, J.; Suekane, F.; Suzuki, A.; Takahashi, Hidehiro; Takahashi, Naoko; Takemoto, Y.; Tamae, K.; Watanabe, Hiroko; Xu, B. D.; Yabumoto, H.; Yonezawa, E.; Yoshida, H. P.; Yoshida, S.; Enomoto, S.; Kozlov, A.; Murayama, Hitoshi; Grant, C.; Keefer, G.; McKee, D.; Piepke, A.; Banks, Thomas; Bloxham, T.; Detwiler, J. A.; Freedman, S. J.; Fujikawa, B. K.; Han, K.; Kadel, R. W.; O’Donnell, T.; Steiner, H.; Winslow, L. A.; Dwyer, D. A.; Mauger, C.; McKeown, R. D.; Zhang, C.; Berger, B. E.; Lane, C.; Maricic, J.; Miletic, T.; Batygov, M.; Learned, J. G.; Matsuno, S.; Pakvasa, Sandip; Sakai, M.; Horton-Smith, G. A.; Tang, Alfred; Downum, K. E.; Gratta, G.; Tolich, K.; Efremenko, Y.; Kamyshkov, Yu.; Perevozchikov, O.; Karwowski, H. J.; Markoff, D. M.; Tornow, W.; Heeger, K. M.; Piquemal, F.; Ricol, J. S.; Decowski, M. P.

doi:10.1103/physrevc.84.035804

Cited by 82 publications

(47 citation statements)

References 29 publications

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“…(v) Poorly reconstructed events are rejected. These events are tagged using a vertex-time-charge discriminator which measures how well the observed PMT time-charge distributions agree with those expected based on the reconstructed vertex [7]. The total cut inefficiency for ββ events is less than 0.1%. )…”

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confidence: 99%

Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen

et al. 2016

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We present an improved search for neutrinoless double-beta (0νββ) decay of 136 Xe in the KamLANDZen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the 110m Ag contaminant identified in previous searches. Combining the results from the first and second phase, we obtain a lower limit for the 0νββ decay half-life of T 0ν 1=2 > 1.07 × 10 26 yr at 90% C.L., an almost sixfold improvement over previous limits. Using commonly adopted nuclear matrix element calculations, the corresponding upper limits on the effective Majorana neutrino mass are in the range 61-165 meV. For the most optimistic nuclear matrix elements, this limit reaches the bottom of the quasidegenerate neutrino mass region. DOI: 10.1103/PhysRevLett.117.082503 Neutrinoless double-beta (0νββ) decay is an exotic nuclear process predicted by extensions of the Standard Model of particle physics. Observation of this decay demonstrates the nonconservation of lepton number, and proves that neutrinos have a Majorana mass component. In the framework of light Majorana neutrino exchange, its decay rate is proportional to the square of the effective Majorana neutrino mass hm ββ i ≡ j P i U 2 ei m ν i j. ) provide upper limits on hm ββ i of ∼0.2-0.4 eV using available nuclear matrix element (NME) values from the literature. The sensitivities of these searches correspond to mass scales in the so-called quasidegenerate mass region.KamLAND-Zen is a double-beta decay experiment that exploits the existing detection infrastructure and radiopurity of KamLAND [5,6]. The KamLAND-Zen detector consists of 13 tons of Xe-loaded liquid scintillator (Xe-LS) contained in a 3.08-m-diameter spherical inner balloon (IB) located at the center of the KamLAND detector. The IB is constructed from 25-μm-thick transparent nylon film and is surrounded by 1 kton of liquid scintillator (LS) contained in a 13-m-diameter spherical outer balloon. The outer LS acts as an active shield. The scintillation photons are viewed by 1879 photomultiplier tubes (PMTs) mounted on the inner surface of the containment vessel. The Xe-LS consists of 80.7% decane and 19.3% pseudocumene (1,2,4-trimethylbenzene) by volume, 2.29 g=liter of the fluor PPO (2,5-diphenyloxazole), and ð2.91 AE 0.04Þ% by weight of isotopically enriched xenon gas. The isotopic abundances in the enriched xenon were measured by a residual gas analyzer to be ð90.77 AE 0.08Þ% 136 Xe, ð8.96AE 0.02Þ% 134 Xe. Other xenon isotopes have negligible presence. The two electrons emitted from 136 Xe ββ decay

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confidence: 99%

Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen

et al. 2016

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“…However, with such a liquid scintillator detector one could also try to study solar neutrinos in a similar fashion as Borexino [11] and KamLAND [84] have done and as SNOþ [17] plans to do. In fact, Borexino has shown how proton-electron-proton, carbon-nitrogenoxygen, and perhaps even proton-proton solar neutrinos can be accessible by such a detector.…”

Section: Discussionmentioning

confidence: 96%

Potential of a neutrino detector in the ANDES underground laboratory for geophysics and astrophysics of neutrinos

et al. 2012

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The construction of the Agua Negra tunnels that will link Argentina and Chile under the Andes, the world longest mountain range, opens the possibility to build the first deep underground laboratory in the Southern Hemisphere. This laboratory has the acronym ANDES (Agua Negra Deep Experiment Site) and its overburden could be as large as ∼ 1.7 km of rock, or 4500 mwe, providing an excellent low background environment to study physics of rare events like the ones induced by neutrinos and/or dark matter. In this paper we investigate the physics potential of a few kiloton size liquid scintillator detector, which could be constructed in the ANDES laboratory as one of its possible scientific programs. In particular, we evaluate the impact of such a detector for the studies of geoneutrinos and galactic supernova neutrinos assuming a fiducial volume of 3 kilotons as a reference size. We emphasize the complementary roles of such a detector to the ones in the Northern Hemisphere neutrino facilities through some advantages due to its geographical location.

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“…In the solar phase, KamLAND is focussed to detect medium energy solar neutrinos (∼1 MeV). We take the latest data for 8 B solar neutrinos based on a 123 kton-day exposure of KamLAND [29]. KamLAND also reported measurement of the neutrino-electron ES rate 862 keV 7 Be solar neutrino based on a 165.4 kton-days exposure of KamLAND for 616 days between April 7, 2009 and June 21, 2011 [42].…”

Section: Data From Various Solar Neutrino Experimentsmentioning

confidence: 99%

“…In the light of latest data available from various solar neutrino experiments, like the Neutral Current Detectors (NCDs) phase of Sudbury Neutrino Observatory (SNO), SuperK-III, SuperK-IV, Borexino and KamLAND solar phase [24][25][26][27][28][29] for neutrinos of energy range ∼1 MeV, we derive, in a model independent way, bounds on the sterile neutrino component present in the solar neutrino flux. We update the limits on the sterile neutrinos (ν s ) flux and compare them with the previous results obtained using various SNO phase data and data from SuperKamiokande experiments.…”

Section: Introductionmentioning

confidence: 99%

Investigating Sterile Neutrino Flux in the Solar Neutrino Data

Ankush

Verma

Sharma

et al. 2019

Advances in High Energy Physics

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There are compelling evidences for the existence of a fourth degree of freedom of neutrinos i.e. sterile neutrino. In the recent studies the role of sterile component of neutrinos has been found to be crucial, not only in particle physics, but also in astrophysics and cosmology. This has been proposed to be one of the potential candidates of dark matter. In this work we investigate the updated solar neutrino data available from all the relevant experiments including Borexino and KamLAND solar phase in a model independent way, and obtain bounds on the sterile neutrino component present in the solar neutrino flux. The mystery of the missing neutrinos is further deepening as subsequent experiments are coming up with their results. The energy spectrum of solar neutrinos, as predicted by Standard Solar Models (SSM), is seen by neutrino experiments at different parts as they are sensitive to various neutrino energy ranges. It is interesting to note that more than 98% of the calculated standard model solar neutrino flux lies below 1 MeV. Therefore, the study of low energy neutrinos can give us better understanding and the possibility to know about the presence of antineutrino and sterile neutrino components in solar neutrino flux. As such, this work becomes interesting as we include the data from medium energy (∼1 MeV) experiments i.e. Borexino and KamLAND solar phase. In our study we retrieve the bounds existing in literature, and rather provide more stringent limits on sterile neutrino (ν s ) flux available in solar neutrino data.

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Measurement of the8B solar neutrino flux with the KamLAND liquid scintillator detector

Cited by 82 publications

References 29 publications

Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen

Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen

Potential of a neutrino detector in the ANDES underground laboratory for geophysics and astrophysics of neutrinos

Investigating Sterile Neutrino Flux in the Solar Neutrino Data

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