Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
C
reaction at 1.8 GeV/
with the Superconducting Kaon spectrometer市川 裕大; 藤田 真奈美; 長谷川 勝一; 今井 憲一*; 七村 拓野; 成木 恵; 佐藤 進; 佐甲 博之; 田村 裕和; 谷田 聖; et al.
Progress of Theoretical and Experimental Physics (Internet), 2024(9), p.091D01_1 - 091D01_13, 2024/09
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)We conducted a measurement of the inclusive missing-mass spectrum in the C
reaction at an incident beam momentum of 1.8 GeV/. This measurement was carried out utilizing the Superconducting Kaon Spectrometer (SKS) and the K1.8 beamline spectrometer at the Hadron Experimental Hall in J-PARC. Remarkably, our experimental setup yielded an exceptionaly good energy resolution of 8.2 MeV (FWHM), enabling us to observe significant enhancements in the vicinity of the 
Be threshold region. In order to estimate the spectrum information, we employed several fitting parameters assumptions. The best agreement with the spectrum shape was obtained with combining quasi-free (QF) component and two-Gaussian functions, with the experimental resolution 
being held constant. The peak positions were obtained to be 
(stat.) 
(syst.) MeV and 
(stat.) 
(syst.) MeV. Another model assumption, utilizing quasi-free (QF) and one Breit-Wigner function with 
(stat.) 
(syst.) MeV and 
(stat.) 
(syst.) MeV, also yielded a similar 
value.
後神 利志*; 江端 健悟; 藤田 真奈美; 原田 健志; 長谷川 勝一; 細見 健二; 市川 裕大; 今井 憲一*; Kim, S.; 七村 拓野; et al.
EPJ Web of Conferences, 271, p.11002_1 - 11002_7, 2022/11
In the K1.8 beam-line at Hadron Experimental Facility of J-PARC, a new magnetic spectrometer S-2S is being installed. S-2S was designed to achieve a high momentum resolution of 
in FWHM. Several strangeness-physics programs which require the high resolution will be realized by S-2S. The present article introduces J-PARC E70 (missing-mass spectroscopy of 
Be) and E94 (missing-mass spectroscopy of 
Li, 
B, and 
C) experiments.
elastic scattering in the momentum range 0.44-0.80 GeV/c七村 拓野; 藤田 真奈美; 長谷川 勝一; 市川 真也; 市川 裕大; 今井 憲一*; 成木 恵; 佐藤 進; 佐甲 博之; 田村 裕和; et al.
Progress of Theoretical and Experimental Physics (Internet), 2022(9), p.093D01_1 - 093D01_35, 2022/09
被引用回数：14 パーセンタイル：84.20(Physics, Multidisciplinary)We performed a novel 
scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 elastic scattering events were identified from 
tagged 
particles in the momentum range 0.44 - 0.80 GeV/c. The differential cross sections of the elastic scattering were derived with much better precision than in previous experiments. The obtained differential cross sections were approximately 2 mb/sr or less, which were not as large as those predicted by the fss2 and FSS models based on the quark cluster model in the short-range region. By performing phase-shift analyses for the obtained differential cross sections, we experimentally derived the phase shifts of the 
and 
channels for the first time. The phase shift of the 3S1 channel, where a large repulsive core was predicted owing to the Pauli effect between quarks, was evaluated to be 
. If the sign of 
is assumed to be negative, the interaction in this channel is moderately repulsive, as the Nijmegen extended-sort-core models predicted.
Tang, J.*; Seo, O.*; Rivera Rocabado, D. S.*; 小板谷 貴典*; 山本 達*; 難波 優輔*; Song, C.*; Kim, J.*; 吉越 章隆; 古山 通久*; et al.
Applied Surface Science, 587, p.152797_1 - 152797_8, 2022/06
被引用回数：9 パーセンタイル：66.53(Chemistry, Physical)水素貯蔵材料として重要な立方体形状Pdナノ粒子の水素吸収と拡散メカニズムをX線光電子分光とDFT計算を用いて調べた。表面領域では粒子の大きさによらず、ほぼ同様の水素吸収挙動を示した。四面体サイトよりも八面体サイトの水素占有率が大きいことがわかった。表面の乱れによってPd-H結合が弱くなるため、小さいサイズのPdナノ粒子に吸収された水素原子は、より活発に粒子内部に拡散することが分かった。これが低水素圧での水素吸着に重要な役割を果たしている。
reaction in momentum range 470-650 MeV/三輪 浩司*; 藤田 真奈美; 長谷川 勝一; 細見 健二; 市川 裕大*; 今井 憲一*; 七村 拓野; 佐甲 博之; 佐藤 進; 田村 裕和; et al.
Physical Review Letters, 128(7), p.072501_1 - 072501_6, 2022/02
The differential cross sections of the reaction were measured accurately for the 
momentum 
ranging from 470 to 650 MeV/ at the J-PARC Hadron Experimental Facility. Precise angular information about the reaction was obtained for the first time by detecting approximately 100 reaction events at each angular step of 
. The obtained differential cross sections show slightly forward-peaking structure in the measured momentum regions. The cross sections integrated for 
were obtained as 
mb and 
mb for 
(MeV/c) 
and 
(MeV/c)
, respectively. These results show a drastic improvement compared to past measurements of the hyperon-proton scattering experiments. They will play essential roles in updating the theoretical models of the baryon-baryon interactions.
elastic scattering in momentum range 470 to 850 MeV/三輪 浩司*; 藤田 真奈美; 長谷川 勝一; 細見 健二; 市川 裕大; 今井 憲一*; 七村 拓野; 成木 恵; 佐甲 博之; 佐藤 進; et al.
Physical Review C, 104(4), p.045204_1 - 045204_20, 2021/10
被引用回数：19 パーセンタイル：91.96(Physics, Nuclear)A high statistics 
scattering experiment is performed at the J-PARC Hadron Experimental Facility. Momentum-tagged 
s running in a liquid hydrogen target are accumulated by detecting the reaction with a high intensity 
beam of 20 M/spill. The differential cross sections of the elastic scattering were derived with a drastically improved accuracy by identifying approximately 4,500 events from 1.72 
10
. The derived differential cross section shows a clear forward-peaking angular distribution for a momentum range from 470 to 850 MeV/. The accurate data will impose a strong constraint on the theoretical models of the baryon-baryon interactions.
-state of a 
hypernucleus, 
吉本 雅浩*; 藤田 真奈美; 橋本 直; 早川 修平; 市川 裕大; 市川 真也; 今井 憲一*; 七村 拓野; 成木 恵; 佐甲 博之; et al.
Progress of Theoretical and Experimental Physics (Internet), 2021(7), p.073D02_1 - 073D02_19, 2021/07
被引用回数：17 パーセンタイル：79.45(Physics, Multidisciplinary)Bound-systems of 
-
are studied via capture at rest followed by emission of a twin single-
hypernucleus in the emulsion detectors. Two events forming extremely deep bound states were obtained by analysis of a hybrid method in the E07 experiment at J-PARC and reanalysis of the E373 experiment at KEK-PS. The decay mode of one event was assigned as 
+
+
+
. Since there are no excited states for daughter particles, the binding energy of the hyperon, 
, in nucleus was uniquely determined to be 6.27 
0.27 MeV. Another - system via the decay 
+ + brings a value, 8.00 0.77 MeV or 4.96 0.77 MeV, where the two possible values of correspond to the ground and the excited states of the daughter nucleus, respectively. Because the values are larger than those of the previously reported events (KISO and IBUKI), which are both interpreted as the nuclear 
state of the - system, these new events give the first indication of the nuclear 
state of the hypernucleus, .
吉田 純也; 赤石 貴也; 藤田 真奈美; 長谷川 勝一; 橋本 直; 細見 健二; 市川 真也; 市川 裕大; 今井 憲一*; Kim, S.; et al.
JPS Conference Proceedings (Internet), 33, p.011112_1 - 011112_8, 2021/03
J-PARC E07 is the most ambitious and complex emulsion experiment to date investigating double hypernuclei with Hybrid emulsion method. The physics run at the K1.8 beam line in the J-PARC hadron experimental facility have been completed in 2017. The emulsion sheets are presently being analyzed with dedicated optical microscopes. Current statistics are estimated to be more 3 times than that of previous experiments. Quantitative data on the 
and 
interaction are being accumulated successfully via analysis of double and hypernuclei. Multiple hypernucleus candidates suggests several features about hypernucleus that the identification efficiency of 
C is significantly higher than other mode, many daughters of C are identified as He or Be, and multiple bound states of exist in the 
N nucleus. An analysis of X-ray spectroscopy of hyperatoms are ongoing.
identification method by the 
reaction for a 
scattering experiment at J-PARC坂尾 珠和*; 藤田 真奈美; 長谷川 勝一; 細見 健二; 市川 真也; 市川 裕大; 今井 憲一*; 七村 拓野; 成木 恵; 佐甲 博之; et al.
JPS Conference Proceedings (Internet), 33, p.011133_1 - 011133_6, 2021/03
The reaction is an important elementary process to produce from a proton target and is a key for a scattering experiment where the momentum of should be tagged from the missing momentum of the 
reaction. However, the spectroscopy method has not been established yet due to the difficulty of the 
detection. Therefore, we have proposed a new detection method where 
and from the decay are measured by a forward magnetic spectrometer and a detector cluster surrounding the target, respectively. The feasibility of the detection method was confirmed by analyzing the J-PARC E40 data taken with such a detector system. In the analysis, 's were successfully identified in the missing mass spectrum of the 
reaction.
scattering experiment at J-PARC赤澤 雄也*; 藤田 真奈美; 長谷川 勝一; 細見 健二; 市川 真也; 市川 裕大; 今井 憲一*; 七村 拓野; 成木 恵; 佐甲 博之; et al.
JPS Conference Proceedings (Internet), 33, p.011134_1 - 011134_6, 2021/03
We are performing a scattering experiment between a 
hyperon and a proton (J-PARC E40) at the K1.8 beamline in the J-PARC Hadron Hall. The purpose of this experiment is to investigate the 
interaction by measuring the differential cross sections of the , elastic scatterings and 
inelastic scattering. The experimental data gives a strong constraint on the theoretical models of the interaction. The identification of scattering event with a high statistics is important by overcoming the difficulties in the hyperon proton scattering experiment. We have introduced a new identification method of the scattering event, which does not need to detect particles directly. We used a new detector system called CATCH and two spectrometer systems installed at the upstream and the downstream of a liquid hydrogen target. A high intensity 
beam of 20 M/spill was used to produce particle. The momenta of beam and scattered 
were measured by the spectrometers to reconstruct the momentum of a beam produced via the 
reactions. The scattering angle and the kinetic energy of recoil protons from the scattering were measured by CATCH for the identification of the scattering events by checking the kinematic consistency. A part of the experiment was performed in 2018 and 2019 in J-PARC. As a result of analyzing the collected data, the production and the scattering reaction have been identified. It means that our new measurement and analysis method are successfully working well. Analysis for deriving the differential cross section of the scattering is on going.
五十嵐 進*; 野村 昌弘; 田村 文彦; 山本 昌亘; 島田 太平; 他49名*
Progress of Theoretical and Experimental Physics (Internet), 2021(3), p.033G01_1 - 033G01_28, 2021/03
被引用回数：7 パーセンタイル：53.19(Physics, Multidisciplinary)The J-PARC Main Ring (MR) has supplied the high-intensity proton beam for the T2K long- baseline neutrino experiment since 2010. The present beam power is 510 kW and the total number of protons on the target reaches 3.6410
. To observe charge-conjugation and parity- transformation (CP) violation in the lepton sector with high accuracy, more protons need to be delivered to the T2K target. The project to upgrade the beam power to 1.3 MW started as a mid-term plan of the MR. In parallel to preparing a full technical design report, the technical designs of hardware upgrades using new technologies and all accelerator components that are necessary to deliver the 1.3 MW beam power are summarized and consolidated in this short paper. Further, this paper includes beam dynamics studies and simulation results for handling 3.310 protons per pulse without significant beam loss in the ring and transport lines.
-N system早川 修平; 藤田 真奈美; 長谷川 勝一; 橋本 直; 細見 健二; 市川 裕大; 今井 憲一*; 七村 拓野; 成木 恵; 佐甲 博之; et al.
Physical Review Letters, 126(6), p.062501_1 - 062501_6, 2021/02
被引用回数：41 パーセンタイル：94.31(Physics, Multidisciplinary)In an emulsion-counter hybrid experiment performed at J-PARC, a absorption event was observed which decayed into twin single- hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as 
N
Be + 
He. For the binding energy of the 
hyperon in the -N system a value of 
MeV was deduced. The energy level of is likely a nuclear state which indicates a weak 
-
coupling.
豊田 智史*; 山本 知樹*; 吉村 真史*; 住田 弘祐*; 三根生 晋*; 町田 雅武*; 吉越 章隆; 鈴木 哲*; 横山 和司*; 大橋 雄二*; et al.
Vacuum and Surface Science, 64(2), p.86 - 91, 2021/02
X線光電子分光法における時空間的な測定・解析技術を開発した。はじめに、NAP-HARPES (Near Ambient Pressure Hard X-ray Angle-Resolved Photo Emission Spectroscopy)データにより、ゲート積層膜界面の時分割深さプロファイル法を開発した。この手法を用いて時分割ARPESデータからピークフィッティングとデプスプロファイリングを迅速に行う手法を確立し、4D-XPS解析を実現した。その結果、従来の最大エントロピー法(MEM)とスパースモデリングのジャックナイフ平均法を組み合わせることで、深さ方向プロファイルを高精度に実現できることがわかった。
hypernuclear spectroscopy with the reaction後神 利志*; 藤田 真奈美; 長谷川 勝一; 細見 健二; 今井 憲一*; 市川 裕大; 七村 拓野; 成木 恵; 佐甲 博之; 佐藤 進; et al.
Journal of Physics; Conference Series, 1643, p.012133_1 - 012133_6, 2020/12
被引用回数：2 パーセンタイル：80.14(Astronomy & Astrophysics)We performed hypernuclear spectroscopy with the reaction at J-PARC to investigate the interaction (J-PARC E05). A new experiment (J-PARC E70) in which a better energy resolution could be achieved is now being prepared. In this article, an analysis status of J-PARC E05 and a preparation status of J-PARC E70 are described.
interaction from the scattering experiment at J-PARC三輪 浩司*; 藤田 真奈美; 長谷川 勝一; 細見 健二; 市川 真也; 市川 裕大; 今井 憲一*; 七村 拓野; 成木 恵; 佐甲 博之; et al.
Journal of Physics; Conference Series, 1643, p.012174_1 - 012174_6, 2020/12
被引用回数：2 パーセンタイル：80.14(Astronomy & Astrophysics)A high statistics scattering experiment has been performed at the K1.8 beamline in the J-PARC Hadron Experimental Facility. Data for momentum-tagged beam running in a liquid hydrogen target were accumulated by detecting the 
reaction with a high intensity beam of 20 M/spill. The number of the beam was about 
in total. The elastic scattering and the inelastic scattering events were successfully observed with about 100 times larger statistics than that in past experiments.
-ray spectroscopy of an 
-shell hypernucleus, 
FYang, S. B.*; 長谷川 勝一; 早川 修平*; 細見 健二; 市川 裕大; 今井 憲一; 佐甲 博之; 佐藤 進; 田村 裕和*; 谷田 聖; et al.
JPS Conference Proceedings (Internet), 26, p.023015_1 - 023015_5, 2019/11
We performed a gamma-ray spectroscopy of 
at J-PARC Hadron Experimental Facility in 2015. It is the first measurement of rays emitted from -shell hypernuclei. In this experiment, we determined the energy spacing between the ground state spin doublet, 
and 
states, as 316 keV. The excitation energies of 
and states are also determined to be 895 and 1266 keV, respectively. The energy spacing is found to be well reproduced by shell-model calculations which describe - and 
-shell hypernuclei well. The results show that the present theories of the 
interaction describe not only the light hypernuclei but also a heavier hypernucleus.
scattering experiment at J-PARC and the analysis status中田 祥之*; 長谷川 勝一; 早川 修平*; 細見 健二; 市川 裕大; 今井 憲一; 七村 拓野*; 成木 恵*; 佐甲 博之; 佐藤 進; et al.
JPS Conference Proceedings (Internet), 26, p.023024_1 - 023024_5, 2019/11
J-PARC E40 aims to measure the differential cross sections of the 
elastic scatterings and the 
conversion. A clear peak of was observed in a missing mass spectrum of the 
reaction and recoil protons from the 
elastic scattering were successfully observed in the data taken in the summer 2018. The rest of data taking is coming in the spring 2019.
hypernucleus in the J-PARC E13 experiment中川 真菜美*; 長谷川 勝一; 早川 修平; 細見 健二; 市川 裕大; 今井 憲一; 佐甲 博之; 佐藤 進; 田村 裕和; 谷田 聖; et al.
JPS Conference Proceedings (Internet), 26, p.023005_1 - 023005_3, 2019/11
The interaction is not much studied than the interaction. To understand the interaction, we study hypernuclei. As for the hypernucleus, only the ground state of has been observed. To obtain more information about the interaction, the excited state should be studied. Therefore, we measure the missing-mass of the 
He
reaction at 
GeV/ and 
2-14
at the J-PARC K1.8 beam line. The ground state of is observed whereas a peak of the excited states is not observed. We also observe suppression of the quasi-free process at smaller angles.
in nuclei through C
spectrum at 1.8 GeV/ in the J-PARC E05 experiment本多 良太郎*; 長谷川 勝一; 早川 修平; 細見 健二; 今井 憲一; 市川 裕大; 七村 拓野; 成木 恵; 佐甲 博之; 佐藤 進; et al.
JPS Conference Proceedings (Internet), 26, p.023014_1 - 023014_4, 2019/11
We measured the 
reaction spectra at 1.8 GeV/ for the graphite and the polyethylene targets in the J-PARC E05 pilot experiment. By comparing the spectra for these two targets, it was found that 
in the 
B nucleus is quite broadened. Furthermore, we also compared broadness of with 
obtained in the 
spectrum. seems to be much more broadened in nuclei than . We gave a possible interpretation, which is related to compositeness of decuplet baryons, for this situation.
-hypernuclei at J-PARC; Results and perspective小池 武志*; 長谷川 勝一; 早川 修平*; 細見 健二; 市川 裕大; 今井 憲一; 佐甲 博之; 佐藤 進; 杉村 仁志; 田村 裕和; et al.
AIP Conference Proceedings 2130, p.020011_1 - 020011_9, 2019/07
被引用回数：2 パーセンタイル：69.64(Physics, Nuclear)Experimental results from the J-PARC E13 experiments are summarized. A new experimental set up of E13 has established a platform for the future -ray hypernuclear spectroscopy at J-PARC using kaon beams. New rays are identified in 
He and F. The energy of 1.406 MeV for the He
transition confirmed a sizable effect of Charge Symmetry Breaking (CSB) in interaction in the 
hypernuclear system. The identification of four rays in F is made for the first time in shell hypernuclei. Especially, energy spacing of the ground state doublet is found to be 315.5 keV. A good agreement with two theoretical calculations suggests that the theoretical formalism used in shell hypernuclei is also applicable to heavier hypernuclei. Lastly, an overview of the future J-PARC E63 experiment is given.
