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Experimental Study of Rare Kaon Decays at J-PARC with KOTO and KOTO II
/ KOTO Collaboration
The rare kaon decay $K_L\to\pi^0\nu\bar{\nu}$ is extremely sensitive to new physics, because the contribution to this decay in the Standard Model (SM) is highly suppressed and known very accurately; the branching ratio is $3\times 10^{-11}$ in the SM with a theoretical uncertainty of just 2%. [...]
arXiv:2505.02568.
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13.
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Development of Prototype MgB$_{2}$ Superconducting Solenoid Magnet for High-efficiency Klystron Applications
/ Watanabe, H (Hitachi, Hitachi) ; Koga, T (Hitachi, Hitachi) ; Tanaka, H (Hitachi, Hitachi) ; Wakuda, T (Hitachi, Hitachi) ; Yamamoto, Akira (KEK, Tsukuba ; CERN) ; Michizono, S (KEK, Tsukuba) ; Syratchev, Igor (CERN) ; Mcmonagle, Gerard (CERN) ; Catalan Lasheras, Nuria (CERN) ; Calatroni, Sergio (CERN)
A wind-and-react MgB 2 solenoid magnet for klystrons has been developed. While the current normal-conducting (Cu) magnet consumes 20 kW per magnet, this MgB$_2$ magnet consumes less than 3 kW in refrigerator power. [...]
CERN-ACC-2020-0022; CLIC-Note-1161.-
Geneva : CERN, 2020 - 7 p.
- Published in : IEEE Trans.Appl.Supercond. 30 (2020) 4601206
Fulltext: PDF;
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Performance of MgB$_{2}$ Superconductor Developed for High-Efficiency Klystron Applications
/ Tanaka, Hideki (Hitachi, Hitachi) ; Suzuki, Takaaki (Hitachi, Hitachi) ; Kodama, Motomune (Hitachi, Hitachi) ; Koga, Tomoyuki (Hitachi, Hitachi) ; Watanabe, Hiroyuki (Hitachi, Hitachi) ; Yamamoto, Akira (KEK, Tsukuba ; CERN) ; Shinichiro, Michizono (KEK, Tsukuba)
An 8-km long MgB$_{2}$ wire for a prototype klystron magnet was made and evaluated. The wire was made by a typical in situ method; it has 10 filaments and 0.67 mm in outer diameter. [...]
CERN-ACC-2020-0021; CLIC-Note-1160.-
Geneva : CERN, 2020 - 6 p.
- Published in : IEEE Trans. Appl. Supercond. 30 (2020) 6200105
Fulltext: PDF;
In : 26th International Conference on Magnet Technology (MT-26), Vancouver, Canada, 22 - 27 Sep 2019, pp.6200105
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Applying Superconducting Magnet Technology for High-efficiency Klystrons in Particle Accelerator RF Systems
/ Yamamoto, Akira (KEK, Tsukuba) ; Michizono, Shinichiro (KEK, Tsukuba) ; Wuensch, Walter (CERN) ; Syratchev, Igor (CERN) ; Mcmonagle, Gerard (CERN) ; Catalan Lasheras, Nuria (CERN) ; Calatroni, Sergio (CERN) ; Stapnes, Steinar (CERN) ; Watanabe, Hiroyuki (Hitachi, Tokyo) ; Tanaka, Hideki (Hitachi, Tokyo) et al.
An M$_{g}$B$_{2}$ superconducting solenoid magnet has been developed for electron beam focusing in X-band (12 GHz) klystrons for particle accelerator RF systems, to provide a central field of 0.8 T at 57 A and at ≥ 20 K. It has successfully realized significant AC-plug power saving in one order of magnitude compared with that for a conventional Cu solenoid magnet. [...]
CERN-ACC-2020-0020; CLIC-Note-1159.-
Geneva : CERN, 2020 - 4 p.
- Published in : IEEE Trans. Appl. Supercond. 30 (2020) 4101304
Fulltext: PDF;
In : 26th International Conference on Magnet Technology (MT-26), Vancouver, Canada, 22 - 27 Sep 2019, pp.4101304
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A new search for the $K_{L} \to \pi^0 \nu \overline{\nu}$ and $K_{L} \to \pi^{0} X^{0}$ decays
/ Ahn, J.K. (Pusan Natl. U.) ; Baek, K.Y. (Pusan Natl. U.) ; Banno, S. (Osaka U.) ; Beckford, B. (Tohoku U.) ; Brubaker, B. (Yale U.) ; Cai, T. (Rochester U.) ; Campbell, M. (CERN) ; Carruth, C. ; Chen, S.H. ; Chu, S. (Stanford U., Phys. Dept.) et al.
We searched for the $CP$-violating rare decay of neutral kaon, $K_{L} \to \pi^0 \nu \overline{\nu}$, in data from the first 100 hours of physics running in 2013 of the J-PARC KOTO experiment. One candidate event was observed while $0.34\pm0.16$ background events were expected. [...]
arXiv:1609.03637.-
2017 - 11 p.
- Published in : Prog. Theor. Exp. Phys. 2017 (2017) 021C01
Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint
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Is the $7/2_1^-$ Isomer State of $^{43}$S Spherical?
/ Chevrier, R (CEA DAM) ; Daugas, J M (CEA DAM) ; Gaudefroy, L (CEA DAM) ; Ichikawa, Y (Nishina Ctr., RIKEN) ; Ueno, H (Nishina Ctr., RIKEN) ; Hass, M (Weizmann Inst.) ; Haas, H (CERN) ; Cottenier, S (Gent U.) ; Aoi, N (Osaka U.) ; Asahi, K (Tokyo Inst. Tech.) et al.
We report on the spectroscopic quadrupole moment measurement of the 7/2−1 isomeric state in S271643 [E∗=320.5(5) keV, T1/2=415(3) ns], using the time dependent perturbed angular distribution technique at the RIKEN RIBF facility. Our value, ∣Qs∣=23(3) efm2, is larger than that expected for a single-particle state. [...]
2012 - 5 p.
- Published in : Phys. Rev. Lett. 108 (2012) 162501
APS published version, local copy: PDF;
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Calibration of LHCf calorimeters for photon measurement by CERN SPS test beam
/ Mase, T (Nagoya U., Solar-Terrestrial Environ. Lab.) ; Adriani, O (INFN, Florence ; Florence U.) ; Bonechi, L (INFN, Florence) ; Bongi, M (INFN, Florence) ; Castellini, G (INFN, Florence ; Florence U.) ; D'Alessandro, R (INFN, Florence ; Florence U.) ; Fukui, K (Nagoya U., Solar-Terrestrial Environ. Lab.) ; Haguenauer, M (Ecole Polytechnique) ; Itow, Y (Nagoya U., Solar-Terrestrial Environ. Lab. ; KMI, Nagoya) ; Kasahara, K (Waseda U., RISE) et al.
Energy resolution and linearity of the LHCf calorimeters for electromagnetic showers were measured at the SPS H4 beam line in 2007 using electron beams of 50–200 GeV and muon beams of 150 GeV. The absolute energy scale was determined in these data. [...]
2012
- Published in : Nucl. Instrum. Methods Phys. Res., A 671 (2012) 129-136
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The LHCf experiment : modelling cosmic rays at LHC
/ Tricomi, A (Catania U. ; INFN Catania) ; Adriani, O (Florence U. ; INFN, Florence) ; Bonechi, L (Florence U. ; INFN, Florence) ; Bongi, M (Florence U. ; INFN, Florence) ; Castellini, G (Florence U. ; INFN, Florence) ; D'Alessandro, R (Florence U. ; INFN, Florence) ; Faus, A (Valencia U., IFIC) ; Fukui, K (Nagoya U., Solar-Terrestrial Environ. Lab.) ; Haguenauer, M (Ecole Polytechnique) ; Itow, Y (Nagoya U., Solar-Terrestrial Environ. Lab.) et al.
The LHCf experiment at LHC has been designed to provide a calibration of nuclear interaction models used in cosmic ray physics up to energies relevant to test the region between the knee and the GZK cut-off. Details of the detector and its performances are discussed..
2008
In : International Europhysics Conference on High Energy Physics, Manchester, UK, 19 - 25 Jul 2007, pp.062026
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Production and test of the LHCf microstrip silicon system
/ Bonechi, L ; Adriani, O ; Bongi, M ; Castellini, G ; D'Alessandro, R ; Faus, A ; Haguenauer, M ; Itow, Y ; Kasahara, K ; Macina, D et al.
2008
- Published in : Nucl. Instrum. Methods Phys. Res., A 596 (2008) 85-87
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