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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.
藤田 真奈美; 長谷川 勝一; 細見 健二; 市川 真也; 市川 裕大; Kim, S.; 七村 拓野; 佐甲 博之; 田村 裕和; 山本 剛史; et al.
Progress of Theoretical and Experimental Physics (Internet), 2022(12), p.123D01_1 - 123D01_17, 2022/12
被引用回数:1 パーセンタイル:15.88(Physics, Multidisciplinary) atomic X-ray spectroscopy is one of the most useful methods for investigation of the
-nucleus strong interaction. Since the X-ray energy is shifted and/or broadened due to the
-nucleus strong interaction compared to those calculated from electromagnetic interaction alone, the measurement of the energy shift,
E, and the width,
, give us information on the
-nucleus potential. A serious problem in the measurement is the significant background derived from in-flight
decay. A novel method of identifying stopped
events using the nuclear emulsion was developed to realize the first
atomic X-ray spectroscopy experiment as the J-PARC E07 experiment, which also aimed at searching for
and
hypernuclei in the emulsion. The X-rays emitted from
Br and
Ag atoms were measured using germanium detectors. No clear peaks were observed in the obtained spectra. However, we succeeded in reducing the background to 1/170 by this method employing coincidence measurements using nuclear emulsion and X-ray detectors.
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.
山本 剛史; 藤田 真奈美; 後神 利志*; 原田 健志*; 早川 修平*; 細見 健二; 市川 裕大; 石川 勇二*; 鎌田 健人*; 叶内 萌香*; et al.
EPJ Web of Conferences, 271, p.03001_1 - 03001_5, 2022/11
X-ray spectroscopy of hadronic atoms give us various information on the strong interaction between hadrons and nuclei. At J-PARC, we are aiming for the world-first detection of the X rays from atoms with a doubly strange hyperon, . Recently, two experiments, J-PARC E07 and J-PARC E03, have been performed for the detection of X rays from
atoms. Overview and status of these measurements will be presented. We will also discuss future plan of X-ray spectroscopy on
-atoms, which can be performed together with high resolution
hyper nuclear spectroscopy using newly constructed S-2S spectrometer. Preparation status will be shown in this contribution.
三輪 浩司*; 藤田 真奈美; 原田 健志; 長谷川 勝一; 細見 健二; 市川 真也; 今井 憲一*; 佐甲 博之; 佐藤 進; 田村 裕和; et al.
EPJ Web of Conferences, 271, p.04001_1 - 04001_7, 2022/11
A new hyperon-proton scattering experiment, dubbed J-PARC E40, was performed to measure differential cross sections of the ,
elastic scatterings and the
scattering by identifying a lot of
particles in the momentum ranging from 0.4 to 0.8 GeV/
produced by the
reactions. We successfully measured the differential cross sections of these three channels with a drastically improved accuracy with a fine angular step. These new data will become important experimental constraints to improve the theories of the two-body baryon-baryon interactions. Following this success, we proposed a new experiment to measure the differential cross sections and spin observables by using a highly polarized
beam for providing quantitative information on the
interaction. The results of three
channels and future prospects of the
scattering experiment are described.
藤田 真奈美; 細見 健二; 石川 勇二*; 叶内 萌香*; 小池 武志*; 小椋 裕*; 田村 裕和; 谷田 聖; 鵜養 美冬*; 山本 剛史
Nuclear Instruments and Methods in Physics Research A, 1042, p.167439_1 - 167439_9, 2022/11
被引用回数:2 パーセンタイル:32.42(Instruments & Instrumentation) atomic X-ray spectroscopy is a powerful method of studying the
N interaction, for which very limited experimental data are currently available. For this reason, we constructed a germanium (Ge) detector array referred to as Hyperball-X and conducted the first-ever
atomic X-ray measurements in 2016 and 2017 at J-PARC. We developed a novel method for in-beam energy calibration of Ge detectors. Three
rays (202 keV, 307 keV, and 511 keV) from
Lu in LSO scintillation counters and
Na source were used as reference. The
and
coincidence detection using the Ge detectors and LSO counters allows for continuous in-beam calibration with this new calibration method, and the calibration uncertainty is reduced to less than
100 eV for energies ranging from 202 to 511 keV.
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:16 パーセンタイル:83.44(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.
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
被引用回数:18 パーセンタイル:86.92(Physics, Multidisciplinary)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.
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:89.84(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.
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:20 パーセンタイル:81.57(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,
.
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.
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.
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.
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:44 パーセンタイル:93.52(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.
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:79.29(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.
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:79.29(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.
市川 裕大*; 藤田 真奈美; 長谷川 勝一; 早川 修平; 佐甲 博之; 佐藤 進; 田村 裕和; 谷田 聖; 山本 剛史; 他36名*
Progress of Theoretical and Experimental Physics (Internet), 2020(12), p.123D01_1 - 123D01_34, 2020/12
被引用回数:9 パーセンタイル:51.10(Physics, Multidisciplinary)We have measured, for the first time, the inclusive missing-mass spectrum of the C
reaction at an incident kaon momentum of 1.8 GeV/c at the J-PARCK 1.8 beamline. We observed a prominent quasi-elastic peak (
in this spectrum. In the quasi-elastic peak region, the effect of secondary interaction is apparently observed as a peak shift, and the peak exhibits a tail in the bound region. We compared the spectrum with a theoretical calculation based on the Green's function method by assuming different values of the parameters for the
-nucleus optical potential. We found that the spectrum shape in the binding-energy region -300 MeV
40 MeV is best reproduced with the potential depths
= -80 MeV (real part) and
= -40 MeV(imaginary part). On the other hand, we observed a significant event excess in the deeply bound region around
100 MeV, where the major decay channel of
is energetically closed, and the non-mesonic decay modes (
and
) should mainly contribute. The enhancement is fitted well by a Breit-Wigner function with a kaon-binding energy of 90 MeV and width 100 MeV. A possible interpretation is a deeply bound state of a
-nucleus system.
七村 拓野; 谷田 聖; 市川 裕大; 佐甲 博之; 佐藤 進; 長谷川 勝一; 山本 剛史; 藤田 真奈美
no journal, ,
J-PARC E40実験は大強度の中間子ビームを用いた(
,K)反応により
粒子を大量に生成すること、液体水素標的とそれを囲む大立体角の検出器システムCATCHを用いて二体反応の力学的再構成を行うことにより、これまで困難であった高統計の
散乱データを得ることを目的とした実験である。
散乱データは2019年4月、2020年5-6月にかけて取得が行われた。この講演ではデータ解析の結果同定した2400イベント程度の
散乱事象から導出した散乱微分断面積について発表する。さらに位相差解析を行い、クォークレベルでのパウリ効果により強い斥力が予想されている
状態の位相のずれを導出した。これらの量に関して理論計算との比較などを行い
相互作用に関する議論も行う。
藤田 真奈美; 田村 裕和; 谷田 聖; 山本 剛史; 鵜養 美冬*
no journal, ,
As part of the J-PARC E07 experiment program, we developed a new method adopting coincidence measurement with magnet spectrometers, nuclear emulsion, and germanium detectors. This method allowed us to obtain the atomic X-ray spectra from heavy nucleus targets, such as Ag and Br, contained in the emulsion. Additionnaly, by selecting X-rays from the diamond target, we obtained
C atomic X-ray spectra. In this poster, I present the results of
atomic X-ray measurements in the E07 experiment and discuss the prospects for future X-ray obsevations.
藤田 真奈美
no journal, ,
原子X線分光はS=-2体系における強い相互作用を理解するために有用な実験手法である。実験の非常に難しい点は、生成した
ハイペロンの崩壊に起因して大量にバックグラウンドが生じる事である。そこで我々は、原子核乾板(エマルション)を用いた静止
選択法を開発した。この手法の導入により信号雑音比の良いクリーンなX線スペクトルの取得が期待された。我々は、J-PARC K1.8ビームラインにおいてカウンター-エマルションハイブリット法を用いた
原子X線測定を実施した。
ハイペロンは
反応により生成し、磁気スぺクトロメータとシリコンストリップ検出器を用いて、反応分光と生成
ハイペロンの飛跡を解析した。この飛跡解析により、エマルション表面の
ハイペロン入射地点を予測でき、短時間での効率の良い解析を実現した。
原子X線は、ゲルマニウム検出器アレイ(Hyperball-X)により測定した。本講演では、銀と臭素の
原子X線測定の最終結果を報告する。