S. Enomoto
A5033773454- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- High-pressure geophysics and materials
- Geophysics and Gravity Measurements
- Advanced NMR Techniques and Applications
- X-ray Diffraction in Crystallography
- Nuclear Physics and Applications
- Crystallization and Solubility Studies
- Physics of Superconductivity and Magnetism
- Atomic and Molecular Physics
- Gamma-ray bursts and supernovae
- Computational Physics and Python Applications
- Advanced Data Storage Technologies
- Scientific Research and Discoveries
- Radioactive Decay and Measurement Techniques
- Spectral Theory in Mathematical Physics
- Particle Detector Development and Performance
- Magnetic confinement fusion research
High Energy Accelerator Research Organization
1990-2024
Osaka University
2010-2015
Jagiellonian University
2015
Institute of Physics
2015
Sapienza University of Rome
2015
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2015
National Centre for Nuclear Research
2015
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2015
Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre
2015
Nagoya University
1952
Abstract The High Luminosity Large Hadron Collider (HL-LHC) is the new flagship project of CERN. First endorsed in 2013 and approved 2016, HL-LHC an upgrade accelerator aiming to increase by a factor ten statistics LHC collisions at horizon 2035–2040. relies on cutting edge technologies: among them, large aperture superconducting magnets will replace present hardware allow smaller beam size two interaction points (IPs). involves construction about 150 six different types: quadrupole triplet,...
We observed a distinct peak in the Λp invariant mass spectrum of He3(K−,Λp)n, well below mK+2mp, i.e., threshold K− to be bound two protons. By selecting relatively large momentum-transfer region q=350∼650 MeV/c, one can kinematically separate from quasi-free process, K‾N→K‾N followed by non-resonant absorption spectator-nucleons K‾NN→ΛN. found that simplest fit gives us Breit–Wigner pole position at BKpp=47±3(stat.)−6+3(sys.) MeV having width ΓKpp=115±7(stat.)−20+10(sys.) MeV, and S-wave...
To search for an |${\rm S} = -1$| di-baryonic state which decays to |$\Lambda p$|, the |${}^3{\rm He}(K^-,\Lambda p)n_{\rm missing}$| reaction was studied at 1.0 GeV}/c$|. Unobserved neutrons were kinematically identified from missing mass |$M_{X}$| of p)X$| in order have a large acceptance pn$| final state. The observed events, distributed widely over allowed region Dalitz plot, establish that major component comes three-nucleon absorption process. A concentration events specific neutron...
We have performed an exclusive measurement of the K−+He3→Λpn reaction at incident kaon momentum 1GeV/c. In Λp invariant mass spectrum, a clear peak was observed below threshold K¯+N+N, as signal kaonic nuclear bound state, K¯NN. The binding energy, decay width, and S-wave Gaussian form factor this state were to be BK=42±3(stat.)−4+3(syst.)MeV, ΓK=100±7(stat.)−9+19(syst.)MeV, QK=383±11(stat.)−1+4(syst.)MeV/c, respectively. total production cross section K¯NN, determined by its mode,...
KEK has been conducting the design study of beam separation dipole magnet, D1, for High Luminosity LHC (HL-LHC) upgrade within a framework CERN-KEK collaboration. The D1 magnet coil aperture 150 mm using Nb-Ti superconducting cable and nominal field 5.6 T can be generated at 12 kA 1.9 K. A integral 35 T·m is required. development 2-m-long model started since May 2013. This paper describes status short as well advancement fundamental studies.
An experiment to search for the $K^-pp$ bound state was performed via in-flight $^3$He($K^-,n)$ reaction using 5.3 $\times$ $10^9$ kaons at 1 GeV/$c$ J-PARC hadron experimental facility. In semi-inclusive neutron missing-mass spectrum $\theta_{n}^{lab}=0^\circ$, no significant peak observed in region corresponding binding energy larger than 80 MeV, where a bump structure has been reported $\Lambda p$ final different reactions. Assuming be isotropically decaying into p$, mass-dependent upper...
Three beam lines for secondary charged particles are constructed in the hadron experimental hall of J-PARC. The K1.8 line, which incorporates two separators, delivers clean beams kaons up to 2 GeV/c. K1.8BR line is a branch K1.8, low-momentum 1.2 K1.1BR shorter designed kaons. Details these designs, as well commissioning results, described.
We measured a set of $\pi^\pm\Sigma^\mp$, $\pi^0\Sigma^0$, and $\pi^-\Sigma^0$ invariant mass spectra below above the $\bar{K}N$ threshold in $K^-$-induced reactions on deuteron. deduced $S$-wave $\bar{K}N\rightarrow\pi\Sigma$ $\bar{K}N\rightarrow\bar{K}N$ scattering amplitudes isospin 0 channel framework $\pi\Sigma$ coupled channel. find that resonance pole corresponding to $\Lambda(1405)$ is located at 1417.7$^{+6.0}_{-7.4}$(fitting errors)$^{+1.1}_{-1.0}$(systematic errors) +...
A new spectrometer system has been designed and constructed at the secondary beam line K1.8BR in hadron hall of J-PARC to investigate |$\bar {K} N$| interactions {K}$|-nuclear bound systems. The consists a high precision spectrometer, liquid 3He/4He/D2 target system, cylindrical detector that surrounds detect decay particles from region, neutron time-of-flight counter array located ∼15 m downstream position. Details design, construction, performance components are described.
In this paper, we discuss the recent finalized analyses by KLOE experiment at DAΦNE: CPT and Lorentz invariance test with entangled K 0 K0 pairs, precision measurement of branching fraction decay + → π -π (γ).We also present status an ongoing analysis aiming to precisely measure ± mass.
KEK has been developing a beam separation dipole magnet for the high luminosity large hadron collider upgrade. The coil aperture of 150 mm and uses NbTi superconducting cable. A magnetic field 5.6 T is generated at 12 kA 1.9 K to provide integral 35 T·m. started development first 2-m-long model evaluate design performance magnet. excitation test was performed from April June 2016 KEK. This paper presents results measurements by rotating probe.
The large aperture superconducting beam separation dipole (D1) must be developed as part of the high luminosity upgrade Large Hadron Collider (HL-LHC) at CERN. most important specifications D1 are a coil 150 mm and field integral 35 T·m 12.0 kA 1.9 K. technical challenges this magnet include predicting changes in size coils during fabrication, achieving radiation resistance, management iron saturation. KEK is charge developing D1. After conducting series design studies, consisting...
The High Energy Accelerator Research Organization (KEK) has been developing a Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Al and Sn subscale magnet to establish the technology for high-field accelerator magnet. development goals are feasibility demonstration cable acquisition of fabrication with superconductors. KEK developed two double-pancake racetrack coils Rutherford-type cables composed 28 wires processed by rapid heating,...
A large aperture beam separation dipole (D1 magnet) is required to generate a field integral of 35 Tm at 12 kA and 1.9 K for the high luminosity upgrade hadron collider (HL-LHC). High-energy accelerator Research Organization (KEK) fabricated first 2 m model (MBXFS1) magnet test was performed in 2015-2016. Although quench current reached nominal operating current, training performance not satisfactory. The measured azimuthal coil pre-stress completely released below this suggested be main...
Large aperture beam separation dipoles (D1 magnet) must be developed for the interaction regions in high-luminosity large hadron collider (HL-LHC). The most important specifications of this magnet are a coil 150 mm and field integral 35 Tm, which will realized by Nb-Ti superconducting magnets operated at 12 kA 1.9 K. High Energy Accelerator Research Organization (KEK) is developing 2-m-long model D1. first was re-assembled after increasing pre-stress (MBXFS1b); subsequently, it showed good...
The high-luminosity Large Hadron Collider (HL-LHC) upgrade project aims to increase the LHC peak luminosity up 5×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">34</sup> cm xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> s xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> and integrated to3000 fb . To achieve this goal, quadrupole dipole magnets around two interaction points, i.e., ATLAS CMS, will be upgraded. High Energy Accelerator...
The beam separation dipole magnet (D1), which is being operated in the large hadron collider (LHC), has to be replaced accordance with upgrade high-luminosity LHC. new D1 will equipped several circuits of heaters by most stored energy dissipated whole during its quench, thereby avoiding localization hot spots. Prior construction production magnet, 2-m mechanical short model fabricated, and performance this quench protection heater evaluated through a series cold tests. As result, we confirm...
Data on the production of η mesons light nuclei near threshold are surveyed.The photoproduction 3 He and elastic scattering from this nucleus modelled in a multiple scheme positions poles both here neighbouring studied an optical potential approach.The 7 Li is compared to that within cluster model.The decay η-mesic through pion or nucleon emission also considered.
A beam separation dipole magnet for the high luminosity large hadron collider upgrade is developed. The development of 2-m-long model (MBXFS1) was initiated so as to evaluate design and performance magnet. In first cold test in 2016, quench not satisfactory because coil prestress at pole completely released during excitation. After reassembly improve performance, excitation modified (MBXFS1b) performed 1.9 K 2017 KEK. Due aperture limited outer diameter iron yoke, control saturation effects...
We observed a distinct peak in the $\Lambda p$ invariant mass spectrum of $^{3}{\rm He}(K^-, \, \Lambda p)n$, well below threshold $m_K + 2 m_p$. By selecting relatively large momentum-transfer region $q = 350 \sim 650$ MeV/$c$, one can clearly separate from quasi-free process, $\overline{K}N \rightarrow \overline{K}N$ followed by non-resonant absorption two spectator-nucleons $\overline{K}NN N $. found that simplest fit to gives us Breit-Wigner pole position at $B_{\rm {\it Kpp}} 47 \pm 3...
We report the test results of second short model magnet beam separation dipole for High Luminosity Large Hadron Collider. The shows that has a good training performance and is capable operating at ultimate current corresponds to 108% nominal one. Magnetic field measurements reveal b <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> around 18 units, which 15 units higher than calculations. This can be explained in part by geometrical coil...
A dedicated D1 beam separation dipole is currently being developed at KEK for the large hadron collider luminosity upgrade (HL-LHC). Four 150-mm aperture, 5.6-T magnetic field, and 6.7-m-long Nb-Ti magnets will replace resistive dipoles. The development includes fabrication testing of 2.2-m model magnets. has a single-layer coil thin spacers between iron, giving nonnegligible impact saturation on field quality nominal field. design straight section cross based two-dimensional (2-D)...