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24 results on '"Karwowski, H. J."'

1. Limits on the Low-Energy Electron Antineutrino Flux from the Brightest GRB of All Time

Author

Araki, T., Chauhan, S., Chiba, K., Eda, T., Eizuka, M., Funahashi, Y., Furuto, A., Gando, A., Gando, Y., Goto, S., Hachiya, T., Hata, K., Ichimura, K., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Marthe, A., Matsumoto, Y., Mitsui, T., Miyake, H., Morita, D., Nakajima, R., Nakamura, K., Nakamura, R., Nakane, J., Ono, T., Ozaki, H., Saito, K., Sakai, T., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Tachibana, K., Tamae, K., Watanabe, H., Watanabe, K., Kurosawa, S., Urano, Y., Yoshida, S., Umehara, S., Fushimi, K., Kotera, K., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Fu, Z., Ghosh, S., Smolsky, J., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Delloro, S., Odonnell, T., Detwiler, J. A., Enomoto, S., Decowski, M. P., Weerman, K. M., Grant, C., Penek, Ö., Song, H., Li, A., Axani, S. N., Garcia, M., and Sarfraz, M.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The electron antinuetrino flux limits are presented for the brightest gamma-ray burst (GRB) of all time, GRB221009A, over a range of 1.8-200 MeV using the Kamioka Liquid Scintillator Anti Neutrino Detector (KamLAND). Using a variety of time windows to search for electron antineutrinos coincident with the GRB, we set an upper limit on the flux under the assumption of various neutrino source spectra. No excess was observed in any time windows ranging from seconds to days around the event trigger time. The limits are compared to the results presented by IceCube., Comment: 8 pages, 3 figures, 1 table

Published
2024

2. Search for Majorana Neutrinos with the Complete KamLAND-Zen Dataset

Author

Abe, S., Araki, T., Chiba, K., Eda, T., Eizuka, M., Funahashi, Y., Furuto, A., Gando, A., Gando, Y., Goto, S., Hachiya, T., Hata, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Marthe, A., Matsumoto, Y., Mitsui, T., Miyake, H., Morita, D., Nakajima, R., Nakamura, K., Nakamura, R., Nakane, J., Ono, T., Ozaki, H., Saito, K., Sakai, T., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Tachibana, K., Tamae, K., Watanabe, H., Watanabe, K., Yoshida, S., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Fu, Z., Ghosh, S., Smolsky, J., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Dell'Oro, S., O'Donnell, T., Detwiler, J. A., Enomoto, S., Decowski, M. P., Weerman, K. M., Grant, C., Penek, O., Song, H., Li, A., Axani, S. N., Garcia, M., and Sarfraz, M.

Subjects
High Energy Physics - Experiment
Abstract

We present a search for neutrinoless double-beta ($0\nu\beta\beta$) decay of $^{136}$Xe using the full KamLAND-Zen 800 dataset with 745 kg of enriched xenon, corresponding to an exposure of $2.097$ ton yr of $^{136}$Xe. This updated search benefits from a more than twofold increase in exposure, recovery of photo-sensor gain, and reduced background from muon-induced spallation of xenon. Combining with the search in the previous KamLAND-Zen phase, we obtain a lower limit for the $0\nu\beta\beta$ decay half-life of $T_{1/2}^{0\nu} > 3.8 \times 10^{26}$ yr at 90% C.L., a factor of 1.7 improvement over the previous limit. The corresponding upper limits on the effective Majorana neutrino mass are in the range 28-122 meV using phenomenological nuclear matrix element calculations., Comment: arXiv admin note: text overlap with arXiv:2203.02139

Published
2024

3. Search for Charged Excited States of Dark Matter with KamLAND-Zen

Author

collaboration, KamLAND-Zen, Abe, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Goto, S., Hachiya, T., Hata, K., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Kurasawa, M., Mitsui, T., Miyake, H., Morita, D., Nakahata, T., Nakajima, R., Nakamura, K., Nakamura, R., Nakane, J., Ozaki, H., Sakai, T., Shimizu, I., Shirai, J., Shiraishi, K., Shoji, R., Suzuki, A., Takeuchi, A., Tamae, K., Watanabe, H., Watanabe, K., Obara, S., Yoshida, S., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Ichikawa, A. K., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Fu, Z., Smolsky, J., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Dell'Oro, S., O'Donnell, T., Detwiler, J. A., Enomoto, S., Decowski, M. P., Weerman, K. M., Grant, C., Li, A., and Song, H.

Subjects
High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

Particle dark matter could belong to a multiplet that includes an electrically charged state. WIMP dark matter ($\chi^{0}$) accompanied by a negatively charged excited state ($\chi^{-}$) with a small mass difference (e.g. $<$ 20 MeV) can form a bound-state with a nucleus such as xenon. This bound-state formation is rare and the released energy is $\mathcal{O}(1-10$) MeV depending on the nucleus, making large liquid scintillator detectors suitable for detection. We searched for bound-state formation events with xenon in two experimental phases of the KamLAND-Zen experiment, a xenon-doped liquid scintillator detector. No statistically significant events were observed. For a benchmark parameter set of WIMP mass $m_{\chi^{0}} = 1$ TeV and mass difference $\Delta m = 17$ MeV, we set the most stringent upper limits on the recombination cross section times velocity $\langle\sigma v\rangle$ and the decay-width of $\chi^{-}$ to $9.2 \times 10^{-30}$ ${\rm cm^3/s}$ and $8.7 \times 10^{-14}$ GeV, respectively at 90% confidence level.

Published
2023
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4. Measurement of cosmic-ray muon spallation products in a xenon-loaded liquid scintillator with KamLAND

Author

Collaboration, KamLAND-Zen, Abe, S., Asami, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Kurasawa, M., Mitsui, T., Miyake, H., Nakahata, T., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A. K., Yoshida, S., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Fu, Z., Smolsky, J., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Dell'Oro, S., O'Donnell, T., Detwiler, J. A., Enomoto, S., Decowski, M. P., Weerman, K., Grant, C., Li, A., and Song, H.

Subjects
High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

Cosmic-ray muons produce various radioisotopes when passing through material. These spallation products can be backgrounds for rare event searches such as in solar neutrino, double-beta decay, and dark matter search experiments. The KamLAND-Zen experiment searches for neutrinoless double-beta decay in 745kg of xenon dissolved in liquid scintillator. The experiment includes dead-time-free electronics with a high efficiency for detecting muon-induced neutrons. The production yields of different radioisotopes are measured with a combination of delayed coincidence techniques, newly developed muon reconstruction and xenon spallation identification methods. The observed xenon spallation products are consistent with results from the FLUKA and Geant4 simulation codes.

Published
2023

5. First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND

Author

KamLAND Collaboration, Abe, S., Asami, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Kurasawa, M., Mitsui, T., Miyake, H., Nakahata, T., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A. K., Yoshida, S., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Fu, Z., Smolsky, J., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Detwiler, J. A., Enomoto, S., Decowski, M. P., Grant, C., Li, A., Song, H., Dell'Oro, S., and O'Donnell, T.

Subjects
High Energy Physics - Experiment
Abstract

We report a measurement of the strange axial coupling constant $g_A^s$ using atmospheric neutrino data at KamLAND. This constant is a component of the axial form factor of the neutral-current quasielastic (NCQE) interaction. The value of $g_A^s$ significantly changes the ratio of proton and neutron NCQE cross sections. KamLAND is suitable for measuring NCQE interactions as it can detect nucleon recoils with low-energy thresholds and measure neutron multiplicity with high efficiency. KamLAND data, including the information on neutron multiplicity associated with the NCQE interactions, makes it possible to measure $g_A^s$ with a suppressed dependence on the axial mass $M_A$, which has not yet been determined. For a comprehensive prediction of the neutron emission associated with neutrino interactions, we establish a simulation of particle emission via nuclear deexcitation of $^{12}$C, a process not considered in existing neutrino Monte Carlo event generators. Energy spectrum fitting for each neutron multiplicity gives $g_A^s =-0.14^{+0.25}_{-0.26}$, which is the most stringent limit obtained using NCQE interactions without $M_A$ constraints. The two-body current contribution considered in this analysis relies on a theoretically effective model and electron scattering experiments and requires future verification by direct measurements and future model improvement.

Published
2022
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6. Abundances of uranium and thorium elements in Earth estimated by geoneutrino spectroscopy

Author

Abe, S., Asami, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Kurasawa, M., Maemura, N., Mitsui, T., Miyake, H., Nakahata, T., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Sambonsugi, H., Shimizu, I., Shirahata, Y., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A. K., Yoshida, S., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Fu, Z., Smolsky, J., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Li, A., Detwiler, J. A., Enomoto, S., Decowski, M. P., Grant, C., Song, H., O'Donnell, T., and Dell'Oro, S.

Subjects
Physics - Geophysics, High Energy Physics - Experiment
Abstract

The decay of the primordial isotopes $^{238}\mathrm{U}$, $^{235}\mathrm{U}$, $^{232}\mathrm{Th}$, and $^{40}\mathrm{K}$ have contributed to the terrestrial heat budget throughout the Earth's history. Hence the individual abundance of those isotopes are key parameters in reconstructing contemporary Earth model. The geoneutrinos produced by the radioactive decays of uranium and thorium have been observed with the Kamioka Liquid-Scintillator Antineutrino Detector (KamLAND). Those measurements have been improved with more than 18-year observation time, and improvements in detector background levels mainly by an 8-year almost rector-free period now permit spectroscopy with geoneutrinos. Our results yield the first constraint on both uranium and thorium heat contributions. Herein the KamLAND result is consistent with geochemical estimations based on elemental abundances of chondritic meteorites and mantle peridotites. The High-Q model is disfavored at 99.76% C.L. and a fully radiogenic model is excluded at 5.2$\sigma$ assuming a homogeneous heat producing element distribution in the mantle., Comment: 13 pages, 2 figures, accepted for publication in Geophysical Research Letters on Aug 4th, 2022

Published
2022
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7. Proton Compton Scattering from Linearly Polarized Gamma Rays

Author

Li, X., Ahmed, M. W., Banu, A., Bartram, C., Crowe, B., Downie, E. J., Emamian, M., Feldman, G., Gao, H., Godagama, D., Grießhammer, H. W., Howell, C. R., Karwowski, H. J., Kendellen, D. P., Kovash, M. A., Leung, K. K. H., Markoff, D. M., McGovern, J. A., Mikhailov, S., Pywell, R. E., Sikora, M. H., Silano, J. A., Sosa, R. S., Spraker, M. C., Swift, G., Wallace, P., Weller, H. R., Whisnant, C. S., Wu, Y. K., and Zhao, Z. W.

Subjects
Nuclear Experiment
Abstract

Differential cross sections for Compton scattering from the proton have been measured at scattering angles of $55^\circ$, $90^\circ$, and $125^\circ$ in the laboratory frame using quasimonoenergetic linearly (circularly) polarized photon beams with a weighted mean energy value of 83.4\,MeV (81.3\,MeV). These measurements were performed at the High Intensity Gamma-Ray Source facility at the Triangle Universities Nuclear Laboratory. The results are compared to previous measurements and are interpreted in the chiral effective field theory framework to extract the electromagnetic dipole polarizabilities of the proton, which gives $\alpha_{E1}^p = 13.8\pm1.2_{\rm stat}\pm0.1_{\rm BSR}\pm0.3_{\rm theo}, \beta_{M1}^p = 0.2\mp1.2_{\rm stat}\pm0.1_{\rm BSR}\mp0.3_{\rm theo}$ in units of 10$^{-4}$\, fm$^3$., Comment: 6 pages, 4 figures. Version identical to the published letter

Published
2022
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8. Search for supernova neutrinos and constraint on the galactic star formation rate with the KamLAND data

Author

Abe, S., Asami, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Kurasawa, M., Maemura, N., Mitsui, T., Miyake, H., Nakahata, T., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Sambonsugi, H., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A., Yoshida, S., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Winslow, L. A., Fu, Z., Smolsky, J., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Li, A., Detwiler, J. A., Enomoto, S., Decowski, M. P., Grant, C., Song, H., O'Donnell, T., and Dell'Oro, S.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

We present the results of a search for core-collapse supernova neutrinos, using long-term KamLAND data from 2002 March 9 to 2020 April 25. We focus on the electron antineutrinos emitted from supernovae in the energy range of 1.8--111 MeV. Supernovae will make a neutrino event cluster with the duration of $\sim$10 s in the KamLAND data. We find no neutrino clusters and give the upper limit on the supernova rate as to be 0.15 yr$^{-1}$ with a 90% confidence level. The detectable range, which corresponds to a >95% detection probability, is 40--59 kpc and 65--81 kpc for core-collapse supernovae and failed core-collapse supernovae, respectively. This paper proposes to convert the supernova rate obtained by the neutrino observation to the Galactic star formation rate. Assuming a modified Salpeter-type initial mass function, the upper limit on the Galactic star formation rate is <(17.5--22.7) $M_{\odot} \mathrm{yr}^{-1}$ with a 90% confidence level., Comment: 10 pages, 4 figures, accepted for publication in Astrophysical Journal

Published
2022
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9. Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen

Author

Collaboration, KamLAND-Zen, Abe, S., Asami, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Hayashida, S., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Kurasawa, M., Maemura, N., Mitsui, T., Miyake, H., Nakahata, T., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Sambonsugi, H., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Ueshima, K., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A. K., Chernyak, D., Kozlov, A., Nakamura, K. Z., Yoshida, S., Takemoto, Y., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Smolsky, J., Fu, Z., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Dell'Oro, S., O'Donnell, T., Detwiler, J. A., Enomoto, S., Decowski, M. P., Grant, C., Li, A., and Song, H.

Subjects
High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta ($0\nu\beta\beta$) decay half-life in $^{136}$Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of $^{136}$Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. We obtain a lower limit for the $0\nu\beta\beta$ decay half-life of $T_{1/2}^{0\nu} > 2.3 \times 10^{26}$ yr at 90% C.L., corresponding to upper limits on the effective Majorana neutrino mass of 36-156 meV using commonly adopted nuclear matrix element calculations., Comment: 7 pages, 3 figures

Published
2022
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10. KamLAND's search for correlated low-energy electron antineutrinos with astrophysical neutrinos from IceCube

Author

Abe, S., Asami, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Kinoshita, T., Koga, M., Kurasawa, M., Maemura, N., Mitsui, T., Miyake, H., Nakahata, T., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Sambonsugi, H., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A. K., Yoshida, S., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Smolsky, J., Lertprasertpong, J., Winslow, L. A., Fu, Z., Ouellet, J., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Li, A., Detwiler, J. A., Enomoto, S., Decowski, M. P., Grant, C., Song, H., O'Donnell, T., and Dell'Oro, S.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report the results of a search for MeV-scale astrophysical neutrinos in KamLAND presented as an excess in the number of coincident neutrino interactions associated with the publicly available high-energy neutrino datasets from the IceCube Neutrino Observatory. We find no statistically significant excess in the number of observed low-energy electron antineutrinos in KamLAND, given a coincidence time window of $\pm$500s, $\pm$1,000s, $\pm$3,600s, and $\pm$10,000s around each of the IceCube neutrinos. We use this observation to present limits from 1.8 MeV to 100 MeV on the electron antineutrino fluence, assuming a mono-energetic flux. We then compare the results to several astrophysical measurements performed by IceCube and place a limit at the 90% confidence level on the electron antineutrino isotropic thermal luminosity from the TXS 0506+056 blazar., Comment: 12 pages, 5 figures

Published
2022
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11. A search for correlated low-energy electron antineutrinos in KamLAND with gamma-ray bursts

Author

Abe, S., Asami, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Kinoshita, T., Koga, M., Maemura, N., Mitsui, T., Miyake, H., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Sambonsugi, H., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Eizuka, M., Kurasawa, M., Nakahata, T., Futagi, S., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A. K., Yoshida, S., Umehara, S., Fushimi, K., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Smolsky, J., Laber-Smith, C., Winslow, L. A., Fu, Z., Ouellet, J., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Li, A., Detwiler, J. A., Enomoto, S., Decowski, M. P., Grant, C., Song, H., O'Donnell, T., and Dell'Oro, S.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

We present the results of a time-coincident event search for low-energy electron antineutrinos in the KamLAND detector with gamma-ray bursts from the Gamma-ray Coordinates Network and Fermi Gamma-ray Burst Monitor. Using a variable coincidence time window of $\pm$500s plus the duration of each gamma-ray burst, no statistically significant excess above background is observed. We place the world's most stringent 90% confidence level upper limit on the electron antineutrino fluence below 17.5 MeV. Assuming a Fermi-Dirac neutrino energy spectrum from the gamma-ray burst source, we use the available redshift data to constrain the electron antineutrino luminosity and effective temperature., Comment: 9 pages, 3 figures

Published
2021
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12. First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND

Author

Abe, S, Asami, S, Eizuka, M, Futagi, S, Gando, A, Gando, Y, Gima, T, Goto, A, Hachiya, T, Hata, K, Ichimura, K, Ieki, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Kamei, Y, Kawada, N, Kishimoto, Y, Koga, M, Kurasawa, M, Mitsui, T, Miyake, H, Nakahata, T, Nakamura, K, Nakamura, R, Ozaki, H, Sakai, T, Shimizu, I, Shirai, J, Shiraishi, K, Suzuki, A, Suzuki, Y, Takeuchi, A, Tamae, K, Watanabe, H, Yoshida, Y, Obara, S, Ichikawa, A, Yoshida, S, Umehara, S, Fushimi, K, Kotera, K, Urano, Y, Berger, B, Fujikawa, B, Learned, J, Maricic, J, Axani, S, Fu, Z, Smolsky, J, Winslow, L, Efremenko, Y, Karwowski, H, Markoff, D, Tornow, W, Detwiler, J, Enomoto, S, Decowski, M, Grant, C, Li, A, Song, H, Dell'Oro, S, O'Donnell, T, Abe S., Asami S., Eizuka M., Futagi S., Gando A., Gando Y., Gima T., Goto A., Hachiya T., Hata K., Ichimura K., Ieki S., Ikeda H., Inoue K., Ishidoshiro K., Kamei Y., Kawada N., Kishimoto Y., Koga M., Kurasawa M., Mitsui T., Miyake H., Nakahata T., Nakamura K., Nakamura R., Ozaki H., Sakai T., Shimizu I., Shirai J., Shiraishi K., Suzuki A., Suzuki Y., Takeuchi A., Tamae K., Watanabe H., Yoshida Y., Obara S., Ichikawa A. K., Yoshida S., Umehara S., Fushimi K., Kotera K., Urano Y., Berger B. E., Fujikawa B. K., Learned J. G., Maricic J., Axani S. N., Fu Z., Smolsky J., Winslow L. A., Efremenko Y., Karwowski H. J., Markoff D. M., Tornow W., Detwiler J. A., Enomoto S., Decowski M. P., Grant C., Li A., Song H., Dell'oro S., O'Donnell T., Abe, S, Asami, S, Eizuka, M, Futagi, S, Gando, A, Gando, Y, Gima, T, Goto, A, Hachiya, T, Hata, K, Ichimura, K, Ieki, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Kamei, Y, Kawada, N, Kishimoto, Y, Koga, M, Kurasawa, M, Mitsui, T, Miyake, H, Nakahata, T, Nakamura, K, Nakamura, R, Ozaki, H, Sakai, T, Shimizu, I, Shirai, J, Shiraishi, K, Suzuki, A, Suzuki, Y, Takeuchi, A, Tamae, K, Watanabe, H, Yoshida, Y, Obara, S, Ichikawa, A, Yoshida, S, Umehara, S, Fushimi, K, Kotera, K, Urano, Y, Berger, B, Fujikawa, B, Learned, J, Maricic, J, Axani, S, Fu, Z, Smolsky, J, Winslow, L, Efremenko, Y, Karwowski, H, Markoff, D, Tornow, W, Detwiler, J, Enomoto, S, Decowski, M, Grant, C, Li, A, Song, H, Dell'Oro, S, O'Donnell, T, Abe S., Asami S., Eizuka M., Futagi S., Gando A., Gando Y., Gima T., Goto A., Hachiya T., Hata K., Ichimura K., Ieki S., Ikeda H., Inoue K., Ishidoshiro K., Kamei Y., Kawada N., Kishimoto Y., Koga M., Kurasawa M., Mitsui T., Miyake H., Nakahata T., Nakamura K., Nakamura R., Ozaki H., Sakai T., Shimizu I., Shirai J., Shiraishi K., Suzuki A., Suzuki Y., Takeuchi A., Tamae K., Watanabe H., Yoshida Y., Obara S., Ichikawa A. K., Yoshida S., Umehara S., Fushimi K., Kotera K., Urano Y., Berger B. E., Fujikawa B. K., Learned J. G., Maricic J., Axani S. N., Fu Z., Smolsky J., Winslow L. A., Efremenko Y., Karwowski H. J., Markoff D. M., Tornow W., Detwiler J. A., Enomoto S., Decowski M. P., Grant C., Li A., Song H., Dell'oro S., and O'Donnell T.

Abstract

We report a measurement of the strange axial coupling constant gAs using atmospheric neutrino data at KamLAND. This constant is a component of the axial form factor of the neutral-current quasielastic (NCQE) interaction. The value of gAs significantly changes the ratio of proton and neutron NCQE cross sections. KamLAND is suitable for measuring NCQE interactions as it can detect nucleon recoils with low-energy thresholds and measure neutron multiplicity with high efficiency. KamLAND data, including the information on neutron multiplicity associated with the NCQE interactions, makes it possible to measure gAs with a suppressed dependence on the axial mass MA, which has not yet been determined. For a comprehensive prediction of the neutron emission associated with neutrino interactions, we establish a simulation of particle emission via nuclear deexcitation of C12, a process not considered in existing neutrino Monte Carlo event generators. Energy spectrum fitting for each neutron multiplicity gives gAs=-0.14-0.26+0.25, which is the most stringent limit obtained using NCQE interactions without MA constraints. The two-body current contribution considered in this analysis relies on a theoretically effective model and electron scattering experiments and requires future verification by direct measurements and future model improvement.

Published
2023

13. First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND

Author

Abe, S., Asami, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Kurasawa, M., Mitsui, T., Miyake, H., Nakahata, T., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A. K., Yoshida, S., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Fu, Z., Smolsky, J., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Detwiler, J. A., Enomoto, S., Decowski, M. P., Grant, C., Li, A., Song, H., Dell’Oro, S., and O’Donnell, T.

Subjects
Quantum Physics, Particle and Plasma Physics, Molecular, Nuclear, Atomic, Nuclear & Particles Physics, Astronomical and Space Sciences
Abstract

We report a measurement of the strange axial coupling constant gAs using atmospheric neutrino data at KamLAND. This constant is a component of the axial form factor of the neutral-current quasielastic (NCQE) interaction. The value of gAs significantly changes the ratio of proton and neutron NCQE cross sections. KamLAND is suitable for measuring NCQE interactions as it can detect nucleon recoils with low-energy thresholds and measure neutron multiplicity with high efficiency. KamLAND data, including the information on neutron multiplicity associated with the NCQE interactions, makes it possible to measure gAs with a suppressed dependence on the axial mass MA, which has not yet been determined. For a comprehensive prediction of the neutron emission associated with neutrino interactions, we establish a simulation of particle emission via nuclear deexcitation of C12, a process not considered in existing neutrino Monte Carlo event generators. Energy spectrum fitting for each neutron multiplicity gives gAs=−0.14−0.26+0.25, which is the most stringent limit obtained using NCQE interactions without MA constraints. The two-body current contribution considered in this analysis relies on a theoretically effective model and electron scattering experiments and requires future verification by direct measurements and future model improvement.

Published
2023

14. Search for Supernova Neutrinos and Constraint on the Galactic Star Formation Rate with the KamLAND Data

Author

Abe, S., primary, Asami, S., additional, Eizuka, M., additional, Futagi, S., additional, Gando, A., additional, Gando, Y., additional, Gima, T., additional, Goto, A., additional, Hachiya, T., additional, Hata, K., additional, Hosokawa, K., additional, Ichimura, K., additional, Ieki, S., additional, Ikeda, H., additional, Inoue, K., additional, Ishidoshiro, K., additional, Kamei, Y., additional, Kawada, N., additional, Kishimoto, Y., additional, Koga, M., additional, Kurasawa, M., additional, Maemura, N., additional, Mitsui, T., additional, Miyake, H., additional, Nakahata, T., additional, Nakamura, K., additional, Nakamura, R., additional, Ozaki, H., additional, Sakai, T., additional, Sambonsugi, H., additional, Shimizu, I., additional, Shirai, J., additional, Shiraishi, K., additional, Suzuki, A., additional, Suzuki, Y., additional, Takeuchi, A., additional, Tamae, K., additional, Watanabe, H., additional, Yoshida, Y., additional, Obara, S., additional, Ichikawa, A., additional, Yoshida, S., additional, Umehara, S., additional, Fushimi, K., additional, Kotera, K., additional, Urano, Y., additional, Berger, B. E., additional, Fujikawa, B. K., additional, Learned, J. G., additional, Maricic, J., additional, Axani, S. N., additional, Winslow, L. A., additional, Fu, Z., additional, Smolsky, J., additional, Efremenko, Y., additional, Karwowski, H. J., additional, Markoff, D. M., additional, Tornow, W., additional, Li, A., additional, Detwiler, J. A., additional, Enomoto, S., additional, Decowski, M. P., additional, Grant, C., additional, Song, H., additional, O’Donnell, T., additional, and Dell’Oro, S., additional

Published
2022
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15. Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen

Author

Zen Collaboration, Abe, S., Asami, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Hayashida, S., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Kurasawa, M., Maemura, N., Mitsui, T., Miyake, H., Nakahata, T., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Sambonsugi, H., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Ueshima, K., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A. K., Chernyak, D., Kozlov, A., Nakamura, K. Z., Yoshida, S., Takemoto, Y., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Smolsky, J., Fu, Z., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Dell'Oro, S., O'Donnell, T., Detwiler, J. A., Enomoto, S., Decowski, M. P., Grant, C., Li, A., and Song, H.

Subjects
High Energy Physics - Experiment (hep-ex), General Physics, KamLAND-Zen Collaboration, Engineering, Physics - Instrumentation and Detectors, Physical Sciences, FOS: Physical sciences, General Physics and Astronomy, Instrumentation and Detectors (physics.ins-det), Mathematical Sciences, High Energy Physics - Experiment
Abstract

The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta ($0\nu\beta\beta$) decay half-life in $^{136}$Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of $^{136}$Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. We obtain a lower limit for the $0\nu\beta\beta$ decay half-life of $T_{1/2}^{0\nu} > 2.3 \times 10^{26}$ yr at 90% C.L., corresponding to upper limits on the effective Majorana neutrino mass of 36-156 meV using commonly adopted nuclear matrix element calculations., Comment: 7 pages, 3 figures

Published
2022

16. A Search for Correlated Low-energy Electron Antineutrinos in KamLAND with Gamma-Ray Bursts

Author

Abe, S., Asami, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Kinoshita, T., Koga, M., Maemura, N., Mitsui, T., Miyake, H., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Sambonsugi, H., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Eizuka, M., Kurasawa, M., Nakahata, T., Futagi, S., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A. K., Yoshida, S., Umehara, S., Fushimi, K., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Smolsky, J., Laber-Smith, C., Winslow, L. A., Fu, Z., Ouellet, J., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Li, A., Detwiler, J. A., Enomoto, S., Decowski, M. P., Grant, C., Song, H., O’Donnell, T., Dell’Oro, S., Abe, S., Asami, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Kinoshita, T., Koga, M., Maemura, N., Mitsui, T., Miyake, H., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Sambonsugi, H., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Eizuka, M., Kurasawa, M., Nakahata, T., Futagi, S., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A. K., Yoshida, S., Umehara, S., Fushimi, K., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Smolsky, J., Laber-Smith, C., Winslow, L. A., Fu, Z., Ouellet, J., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Li, A., Detwiler, J. A., Enomoto, S., Decowski, M. P., Grant, C., Song, H., O’Donnell, T., and Dell’Oro, S.

Abstract

We present the results of a time-coincident event search for low-energy electron antineutrinos in the KamLAND detector with gamma-ray bursts (GRBs) from the Gamma-ray Coordinates Network and Fermi Gamma-ray Burst Monitor. Using a variable coincidence time window of ±500 s plus the duration of each GRB, no statistically significant excess above the background is observed. We place the world’s most stringent 90% confidence level upper limit on the electron antineutrino fluence below 17.5 MeV. Assuming a Fermi–Dirac neutrino energy spectrum from the GRB source, we use the available redshift data to constrain the electron antineutrino luminosity and effective temperature.

Published
2022

17. Limits on Astrophysical Antineutrinos with the KamLAND Experiment

Author

Abe, S, Asami, S, Gando, A, Gando, Y, Gima, T, Goto, A, Hachiya, T, Hata, K, Hayashida, S, Hosokawa, K, Ichimura, K, Ieki, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Kamei, Y, Kawada, N, Kishimoto, Y, Kinoshita, T, Koga, M, Maemura, N, Mitsui, T, Miyake, H, Nakamura, K, Nakamura, R, Ozaki, H, Sakai, T, Sambonsugi, H, Shimizu, I, Shirahata, Y, Shirai, J, Shiraishi, K, Suzuki, A, Suzuki, Y, Takeuchi, A, Tamae, K, Ueshima, K, Wada, Y, Watanabe, H, Yoshida, Y, Obara, S, Ichikawa, A, Kozlov, A, Chernyak, D, Takemoto, Y, Yoshida, S, Umehara, S, Fushimi, K, Hirata, S, Yoshida, M, Berger, B, Fujikawa, B, Learned, J, Maricic, J, Axani, S, Winslow, L, Fu, Z, Ouellet, J, Efremenko, Y, Karwowski, H, Markoff, D, Tornow, W, Li, A, Detwiler, J, Enomoto, S, Decowski, M, Grant, C, O'Donnell, T, Dell'Oro, S, Abe S., Asami S., Gando A., Gando Y., Gima T., Goto A., Hachiya T., Hata K., Hayashida S., Hosokawa K., Ichimura K., Ieki S., Ikeda H., Inoue K., Ishidoshiro K., Kamei Y., Kawada N., Kishimoto Y., Kinoshita T., Koga M., Maemura N., Mitsui T., Miyake H., Nakamura K., Nakamura R., Ozaki H., Sakai T., Sambonsugi H., Shimizu I., Shirahata Y., Shirai J., Shiraishi K., Suzuki A., Suzuki Y., Takeuchi A., Tamae K., Ueshima K., Wada Y., Watanabe H., Yoshida Y., Obara S., Ichikawa A. K., Kozlov A., Chernyak D., Takemoto Y., Yoshida S., Umehara S., Fushimi K., Hirata S., Nakamura K. Z., Yoshida M., Berger B. E., Fujikawa B. K., Learned J. G., Maricic J., Axani S. N., Winslow L. A., Fu Z., Ouellet J., Efremenko Y., Karwowski H. J., Markoff D. M., Tornow W., Li A., Detwiler J. A., Enomoto S., Decowski M. P., Grant C., O'Donnell T., Dell'Oro S., Abe, S, Asami, S, Gando, A, Gando, Y, Gima, T, Goto, A, Hachiya, T, Hata, K, Hayashida, S, Hosokawa, K, Ichimura, K, Ieki, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Kamei, Y, Kawada, N, Kishimoto, Y, Kinoshita, T, Koga, M, Maemura, N, Mitsui, T, Miyake, H, Nakamura, K, Nakamura, R, Ozaki, H, Sakai, T, Sambonsugi, H, Shimizu, I, Shirahata, Y, Shirai, J, Shiraishi, K, Suzuki, A, Suzuki, Y, Takeuchi, A, Tamae, K, Ueshima, K, Wada, Y, Watanabe, H, Yoshida, Y, Obara, S, Ichikawa, A, Kozlov, A, Chernyak, D, Takemoto, Y, Yoshida, S, Umehara, S, Fushimi, K, Hirata, S, Yoshida, M, Berger, B, Fujikawa, B, Learned, J, Maricic, J, Axani, S, Winslow, L, Fu, Z, Ouellet, J, Efremenko, Y, Karwowski, H, Markoff, D, Tornow, W, Li, A, Detwiler, J, Enomoto, S, Decowski, M, Grant, C, O'Donnell, T, Dell'Oro, S, Abe S., Asami S., Gando A., Gando Y., Gima T., Goto A., Hachiya T., Hata K., Hayashida S., Hosokawa K., Ichimura K., Ieki S., Ikeda H., Inoue K., Ishidoshiro K., Kamei Y., Kawada N., Kishimoto Y., Kinoshita T., Koga M., Maemura N., Mitsui T., Miyake H., Nakamura K., Nakamura R., Ozaki H., Sakai T., Sambonsugi H., Shimizu I., Shirahata Y., Shirai J., Shiraishi K., Suzuki A., Suzuki Y., Takeuchi A., Tamae K., Ueshima K., Wada Y., Watanabe H., Yoshida Y., Obara S., Ichikawa A. K., Kozlov A., Chernyak D., Takemoto Y., Yoshida S., Umehara S., Fushimi K., Hirata S., Nakamura K. Z., Yoshida M., Berger B. E., Fujikawa B. K., Learned J. G., Maricic J., Axani S. N., Winslow L. A., Fu Z., Ouellet J., Efremenko Y., Karwowski H. J., Markoff D. M., Tornow W., Li A., Detwiler J. A., Enomoto S., Decowski M. P., Grant C., O'Donnell T., and Dell'Oro S.

Abstract

We report on a search for electron antineutrinos ( ) from astrophysical sources in the neutrino energy range 8.3-30.8 MeV with the KamLAND detector. In an exposure of 6.72 kton-year of the liquid scintillator, we observe 18 candidate events via the inverse beta decay reaction. Although there is a large background uncertainty from neutral current atmospheric neutrino interactions, we find no significant excess over background model predictions. Assuming several supernova relic neutrino spectra, we give upper flux limits of 60-110 cm-2 s-1 (90% confidence level, CL) in the analysis range and present a model-independent flux. We also set limits on the annihilation rates for light dark matter pairs to neutrino pairs. These data improve on the upper probability limit of 8B solar neutrinos converting into , (90% CL) assuming an undistorted shape. This corresponds to a solar flux of 60 cm-2 s-1 (90% CL) in the analysis energy range.

Published
2022

18. Search for Solar Flare Neutrinos with the KamLAND Detector

Author

Abe, S, Asami, S, Gando, A, Gando, Y, Gima, T, Goto, A, Hachiya, T, Hata, K, Hayashida, S, Hosokawa, K, Ichimura, K, Ieki, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Kamei, Y, Kawada, N, Kishimoto, Y, Kinoshita, T, Koga, M, Maemura, N, Mitsui, T, Miyake, H, Nakamura, K, Nakamura, R, Ozaki, H, Sakai, T, Sambonsugi, H, Shimizu, I, Shirai, J, Shiraishi, K, Suzuki, A, Suzuki, Y, Takeuchi, A, Tamae, K, Ueshima, K, Wada, Y, Watanabe, H, Yoshida, Y, Obara, S, Ichikawa, A, Kozlov, A, Chernyak, D, Takemoto, Y, Yoshida, S, Umehara, S, Fushimi, K, Yoshida, M, Berger, B, Fujikawa, B, Learned, J, Maricic, J, Axani, S, Winslow, L, Fu, Z, Ouellet, J, Efremenko, Y, Karwowski, H, Markoff, D, Tornow, W, Li, A, Detwiler, J, Enomoto, S, Decowski, M, Grant, C, O'Donnell, T, Dell'Oro, S, Abe S., Asami S., Gando A., Gando Y., Gima T., Goto A., Hachiya T., Hata K., Hayashida S., Hosokawa K., Ichimura K., Ieki S., Ikeda H., Inoue K., Ishidoshiro K., Kamei Y., Kawada N., Kishimoto Y., Kinoshita T., Koga M., Maemura N., Mitsui T., Miyake H., Nakamura K., Nakamura R., Ozaki H., Sakai T., Sambonsugi H., Shimizu I., Shirai J., Shiraishi K., Suzuki A., Suzuki Y., Takeuchi A., Tamae K., Ueshima K., Wada Y., Watanabe H., Yoshida Y., Obara S., Ichikawa A. K., Kozlov A., Chernyak D., Takemoto Y., Yoshida S., Umehara S., Fushimi K., Nakamura K. Z., Yoshida M., Berger B. E., Fujikawa B. K., Learned J. G., Maricic J., Axani S. N., Winslow L. A., Fu Z., Ouellet J., Efremenko Y., Karwowski H. J., Markoff D. M., Tornow W., Li A., Detwiler J. A., Enomoto S., Decowski M. P., Grant C., O'Donnell T., Dell'Oro S., Abe, S, Asami, S, Gando, A, Gando, Y, Gima, T, Goto, A, Hachiya, T, Hata, K, Hayashida, S, Hosokawa, K, Ichimura, K, Ieki, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Kamei, Y, Kawada, N, Kishimoto, Y, Kinoshita, T, Koga, M, Maemura, N, Mitsui, T, Miyake, H, Nakamura, K, Nakamura, R, Ozaki, H, Sakai, T, Sambonsugi, H, Shimizu, I, Shirai, J, Shiraishi, K, Suzuki, A, Suzuki, Y, Takeuchi, A, Tamae, K, Ueshima, K, Wada, Y, Watanabe, H, Yoshida, Y, Obara, S, Ichikawa, A, Kozlov, A, Chernyak, D, Takemoto, Y, Yoshida, S, Umehara, S, Fushimi, K, Yoshida, M, Berger, B, Fujikawa, B, Learned, J, Maricic, J, Axani, S, Winslow, L, Fu, Z, Ouellet, J, Efremenko, Y, Karwowski, H, Markoff, D, Tornow, W, Li, A, Detwiler, J, Enomoto, S, Decowski, M, Grant, C, O'Donnell, T, Dell'Oro, S, Abe S., Asami S., Gando A., Gando Y., Gima T., Goto A., Hachiya T., Hata K., Hayashida S., Hosokawa K., Ichimura K., Ieki S., Ikeda H., Inoue K., Ishidoshiro K., Kamei Y., Kawada N., Kishimoto Y., Kinoshita T., Koga M., Maemura N., Mitsui T., Miyake H., Nakamura K., Nakamura R., Ozaki H., Sakai T., Sambonsugi H., Shimizu I., Shirai J., Shiraishi K., Suzuki A., Suzuki Y., Takeuchi A., Tamae K., Ueshima K., Wada Y., Watanabe H., Yoshida Y., Obara S., Ichikawa A. K., Kozlov A., Chernyak D., Takemoto Y., Yoshida S., Umehara S., Fushimi K., Nakamura K. Z., Yoshida M., Berger B. E., Fujikawa B. K., Learned J. G., Maricic J., Axani S. N., Winslow L. A., Fu Z., Ouellet J., Efremenko Y., Karwowski H. J., Markoff D. M., Tornow W., Li A., Detwiler J. A., Enomoto S., Decowski M. P., Grant C., O'Donnell T., and Dell'Oro S.

Abstract

We report the result of a search for neutrinos in coincidence with solar flares from the GOES flare database. The search was performed on a 10.8 kton-year exposure of KamLAND collected from 2002 to 2019. This large exposure allows us to explore previously unconstrained parameter space for solar flare neutrinos. We found no statistical excess of neutrinos and established 90% confidence level upper limits of 8.4 × 107 cm-2 (3.0 × 109 cm-2) on the electron antineutrino (electron neutrino) fluence at 20 MeV normalized to the X12 flare, assuming that the neutrino fluence is proportional to the X-ray intensity.

Published
2022

19. KamLAND's search for correlated low-energy electron antineutrinos with astrophysical neutrinos from IceCube

Author

Abe, S, Asami, S, Eizuka, M, Futagi, S, Gando, A, Gando, Y, Gima, T, Goto, A, Hachiya, T, Hata, K, Hosokawa, K, Ichimura, K, Ieki, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Kamei, Y, Kawada, N, Kishimoto, Y, Kinoshita, T, Koga, M, Kurasawa, M, Maemura, N, Mitsui, T, Miyake, H, Nakahata, T, Nakamura, K, Nakamura, R, Ozaki, H, Sakai, T, Sambonsugi, H, Shimizu, I, Shirai, J, Shiraishi, K, Suzuki, A, Suzuki, Y, Takeuchi, A, Tamae, K, Watanabe, H, Yoshida, Y, Obara, S, Ichikawa, A, Yoshida, S, Umehara, S, Fushimi, K, Kotera, K, Urano, Y, Berger, B, Fujikawa, B, Learned, J, Maricic, J, Axani, S, Smolsky, J, Lertprasertpong, J, Winslow, L, Fu, Z, Ouellet, J, Efremenko, Y, Karwowski, H, Markoff, D, Tornow, W, Li, A, Detwiler, J, Enomoto, S, Decowski, M, Grant, C, Song, H, O'Donnell, T, Dell'Oro, S, Abe S., Asami S., Eizuka M., Futagi S., Gando A., Gando Y., Gima T., Goto A., Hachiya T., Hata K., Hosokawa K., Ichimura K., Ieki S., Ikeda H., Inoue K., Ishidoshiro K., Kamei Y., Kawada N., Kishimoto Y., Kinoshita T., Koga M., Kurasawa M., Maemura N., Mitsui T., Miyake H., Nakahata T., Nakamura K., Nakamura R., Ozaki H., Sakai T., Sambonsugi H., Shimizu I., Shirai J., Shiraishi K., Suzuki A., Suzuki Y., Takeuchi A., Tamae K., Watanabe H., Yoshida Y., Obara S., Ichikawa A. K., Yoshida S., Umehara S., Fushimi K., Kotera K., Urano Y., Berger B. E., Fujikawa B. K., Learned J. G., Maricic J., Axani S. N., Smolsky J., Lertprasertpong J., Winslow L. A., Fu Z., Ouellet J., Efremenko Y., Karwowski H. J., Markoff D. M., Tornow W., Li A., Detwiler J. A., Enomoto S., Decowski M. P., Grant C., Song H., O'Donnell T., Dell'Oro S., Abe, S, Asami, S, Eizuka, M, Futagi, S, Gando, A, Gando, Y, Gima, T, Goto, A, Hachiya, T, Hata, K, Hosokawa, K, Ichimura, K, Ieki, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Kamei, Y, Kawada, N, Kishimoto, Y, Kinoshita, T, Koga, M, Kurasawa, M, Maemura, N, Mitsui, T, Miyake, H, Nakahata, T, Nakamura, K, Nakamura, R, Ozaki, H, Sakai, T, Sambonsugi, H, Shimizu, I, Shirai, J, Shiraishi, K, Suzuki, A, Suzuki, Y, Takeuchi, A, Tamae, K, Watanabe, H, Yoshida, Y, Obara, S, Ichikawa, A, Yoshida, S, Umehara, S, Fushimi, K, Kotera, K, Urano, Y, Berger, B, Fujikawa, B, Learned, J, Maricic, J, Axani, S, Smolsky, J, Lertprasertpong, J, Winslow, L, Fu, Z, Ouellet, J, Efremenko, Y, Karwowski, H, Markoff, D, Tornow, W, Li, A, Detwiler, J, Enomoto, S, Decowski, M, Grant, C, Song, H, O'Donnell, T, Dell'Oro, S, Abe S., Asami S., Eizuka M., Futagi S., Gando A., Gando Y., Gima T., Goto A., Hachiya T., Hata K., Hosokawa K., Ichimura K., Ieki S., Ikeda H., Inoue K., Ishidoshiro K., Kamei Y., Kawada N., Kishimoto Y., Kinoshita T., Koga M., Kurasawa M., Maemura N., Mitsui T., Miyake H., Nakahata T., Nakamura K., Nakamura R., Ozaki H., Sakai T., Sambonsugi H., Shimizu I., Shirai J., Shiraishi K., Suzuki A., Suzuki Y., Takeuchi A., Tamae K., Watanabe H., Yoshida Y., Obara S., Ichikawa A. K., Yoshida S., Umehara S., Fushimi K., Kotera K., Urano Y., Berger B. E., Fujikawa B. K., Learned J. G., Maricic J., Axani S. N., Smolsky J., Lertprasertpong J., Winslow L. A., Fu Z., Ouellet J., Efremenko Y., Karwowski H. J., Markoff D. M., Tornow W., Li A., Detwiler J. A., Enomoto S., Decowski M. P., Grant C., Song H., O'Donnell T., and Dell'Oro S.

Abstract

We report the results of a search for MeV-scale astrophysical neutrinos in KamLAND presented as an excess in the number of coincident neutrino interactions associated with the publicly available high-energy neutrino datasets from the IceCube Neutrino Observatory. We find no statistically significant excess in the number of observed low-energy electron antineutrinos in KamLAND, given a coincidence time window of ±500 s, ±1,000 s, ±3,600 s, and ±10,000 s around each of the IceCube neutrinos. We use this observation to present limits from 1.8 MeV to 100 MeV on the electron antineutrino fluence, assuming a mono-energetic flux. We then compare the results to several astrophysical measurements performed by IceCube and place a limit at the 90% confidence level on the electron antineutrino isotropic thermal luminosity from the TXS 0506+056 blazar.

Published
2022

20. Proton Compton Scattering from Linearly Polarized Gamma Rays

Author

Li, X., primary, Ahmed, M. W., additional, Banu, A., additional, Bartram, C., additional, Crowe, B., additional, Downie, E. J., additional, Emamian, M., additional, Feldman, G., additional, Gao, H., additional, Godagama, D., additional, Grießhammer, H. W., additional, Howell, C. R., additional, Karwowski, H. J., additional, Kendellen, D. P., additional, Kovash, M. A., additional, Leung, K. K. H., additional, Markoff, D. M., additional, McGovern, J. A., additional, Mikhailov, S., additional, Pywell, R. E., additional, Sikora, M. H., additional, Silano, J. A., additional, Sosa, R. S., additional, Spraker, M. C., additional, Swift, G., additional, Wallace, P., additional, Weller, H. R., additional, Whisnant, C. S., additional, Wu, Y. K., additional, and Zhao, Z. W., additional

Published
2022
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21. A Search for Correlated Low-energy Electron Antineutrinos in KamLAND with Gamma-Ray Bursts

Author

Abe, S., primary, Asami, S., additional, Gando, A., additional, Gando, Y., additional, Gima, T., additional, Goto, A., additional, Hachiya, T., additional, Hata, K., additional, Hosokawa, K., additional, Ichimura, K., additional, Ieki, S., additional, Ikeda, H., additional, Inoue, K., additional, Ishidoshiro, K., additional, Kamei, Y., additional, Kawada, N., additional, Kishimoto, Y., additional, Kinoshita, T., additional, Koga, M., additional, Maemura, N., additional, Mitsui, T., additional, Miyake, H., additional, Nakamura, K., additional, Nakamura, R., additional, Ozaki, H., additional, Sakai, T., additional, Sambonsugi, H., additional, Shimizu, I., additional, Shirai, J., additional, Shiraishi, K., additional, Suzuki, A., additional, Suzuki, Y., additional, Takeuchi, A., additional, Tamae, K., additional, Eizuka, M., additional, Kurasawa, M., additional, Nakahata, T., additional, Futagi, S., additional, Watanabe, H., additional, Yoshida, Y., additional, Obara, S., additional, Ichikawa, A. K., additional, Yoshida, S., additional, Umehara, S., additional, Fushimi, K., additional, Berger, B. E., additional, Fujikawa, B. K., additional, Learned, J. G., additional, Maricic, J., additional, Axani, S. N., additional, Smolsky, J., additional, Laber-Smith, C., additional, Winslow, L. A., additional, Fu, Z., additional, Ouellet, J., additional, Efremenko, Y., additional, Karwowski, H. J., additional, Markoff, D. M., additional, Tornow, W., additional, Li, A., additional, Detwiler, J. A., additional, Enomoto, S., additional, Decowski, M. P., additional, Grant, C., additional, Song, H., additional, O’Donnell, T., additional, and Dell’Oro, S., additional

Published
2022
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22. Limits on Astrophysical Antineutrinos with the KamLAND Experiment

Author

Abe, S., primary, Asami, S., additional, Gando, A., additional, Gando, Y., additional, Gima, T., additional, Goto, A., additional, Hachiya, T., additional, Hata, K., additional, Hayashida, S., additional, Hosokawa, K., additional, Ichimura, K., additional, Ieki, S., additional, Ikeda, H., additional, Inoue, K., additional, Ishidoshiro, K., additional, Kamei, Y., additional, Kawada, N., additional, Kishimoto, Y., additional, Kinoshita, T., additional, Koga, M., additional, Maemura, N., additional, Mitsui, T., additional, Miyake, H., additional, Nakamura, K., additional, Nakamura, R., additional, Ozaki, H., additional, Sakai, T., additional, Sambonsugi, H., additional, Shimizu, I., additional, Shirahata, Y., additional, Shirai, J., additional, Shiraishi, K., additional, Suzuki, A., additional, Suzuki, Y., additional, Takeuchi, A., additional, Tamae, K., additional, Ueshima, K., additional, Wada, Y., additional, Watanabe, H., additional, Yoshida, Y., additional, Obara, S., additional, Ichikawa, A. K., additional, Kozlov, A., additional, Chernyak, D., additional, Takemoto, Y., additional, Yoshida, S., additional, Umehara, S., additional, Fushimi, K., additional, Hirata, S., additional, Nakamura, K. Z., additional, Yoshida, M., additional, Berger, B. E., additional, Fujikawa, B. K., additional, Learned, J. G., additional, Maricic, J., additional, Axani, S. N., additional, Winslow, L. A., additional, Fu, Z., additional, Ouellet, J., additional, Efremenko, Y., additional, Karwowski, H. J., additional, Markoff, D. M., additional, Tornow, W., additional, Li, A., additional, Detwiler, J. A., additional, Enomoto, S., additional, Decowski, M. P., additional, Grant, C., additional, O’Donnell, T., additional, and Dell’Oro, S., additional

Published
2022
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23. Search for Solar Flare Neutrinos with the KamLAND Detector

Author

Abe, S., primary, Asami, S., additional, Gando, A., additional, Gando, Y., additional, Gima, T., additional, Goto, A., additional, Hachiya, T., additional, Hata, K., additional, Hayashida, S., additional, Hosokawa, K., additional, Ichimura, K., additional, Ieki, S., additional, Ikeda, H., additional, Inoue, K., additional, Ishidoshiro, K., additional, Kamei, Y., additional, Kawada, N., additional, Kishimoto, Y., additional, Kinoshita, T., additional, Koga, M., additional, Maemura, N., additional, Mitsui, T., additional, Miyake, H., additional, Nakamura, K., additional, Nakamura, R., additional, Ozaki, H., additional, Sakai, T., additional, Sambonsugi, H., additional, Shimizu, I., additional, Shirai, J., additional, Shiraishi, K., additional, Suzuki, A., additional, Suzuki, Y., additional, Takeuchi, A., additional, Tamae, K., additional, Ueshima, K., additional, Wada, Y., additional, Watanabe, H., additional, Yoshida, Y., additional, Obara, S., additional, Ichikawa, A. K., additional, Kozlov, A., additional, Chernyak, D., additional, Takemoto, Y., additional, Yoshida, S., additional, Umehara, S., additional, Fushimi, K., additional, Nakamura, K. Z., additional, Yoshida, M., additional, Berger, B. E., additional, Fujikawa, B. K., additional, Learned, J. G., additional, Maricic, J., additional, Axani, S. N., additional, Winslow, L. A., additional, Fu, Z., additional, Ouellet, J., additional, Efremenko, Y., additional, Karwowski, H. J., additional, Markoff, D. M., additional, Tornow, W., additional, Li, A., additional, Detwiler, J. A., additional, Enomoto, S., additional, Decowski, M. P., additional, Grant, C., additional, O’Donnell, T., additional, and Dell’Oro, S., additional

Published
2022
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24. Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen.

Author

Abe S, Asami S, Eizuka M, Futagi S, Gando A, Gando Y, Gima T, Goto A, Hachiya T, Hata K, Hayashida S, Hosokawa K, Ichimura K, Ieki S, Ikeda H, Inoue K, Ishidoshiro K, Kamei Y, Kawada N, Kishimoto Y, Koga M, Kurasawa M, Maemura N, Mitsui T, Miyake H, Nakahata T, Nakamura K, Nakamura K, Nakamura R, Ozaki H, Sakai T, Sambonsugi H, Shimizu I, Shirai J, Shiraishi K, Suzuki A, Suzuki Y, Takeuchi A, Tamae K, Ueshima K, Watanabe H, Yoshida Y, Obara S, Ichikawa AK, Chernyak D, Kozlov A, Nakamura KZ, Yoshida S, Takemoto Y, Umehara S, Fushimi K, Kotera K, Urano Y, Berger BE, Fujikawa BK, Learned JG, Maricic J, Axani SN, Smolsky J, Fu Z, Winslow LA, Efremenko Y, Karwowski HJ, Markoff DM, Tornow W, Dell'Oro S, O'Donnell T, Detwiler JA, Enomoto S, Decowski MP, Grant C, Li A, and Song H

Abstract

The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta (0νββ) decay half-life in ^{136}Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of ^{136}Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. We obtain a lower limit for the 0νββ decay half-life of T&#95;{1/2}^{0ν}>2.3×10^{26}  yr at 90% C.L., corresponding to upper limits on the effective Majorana neutrino mass of 36-156 meV using commonly adopted nuclear matrix element calculations.

Published
2023
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