JAEA
  • help
  • PC | SP
  • JP | EN
          
検索対象：     
報告書番号：
※ 半角英数字
 年 ～ 
 年
全てクリア
検索結果：　5 件中 1件目～5件目を表示
  • 1

発表形式

Initialising ...

選択項目を絞り込む

掲載資料名

Initialising ...

発表会議名

Initialising ...

筆頭著者名

Initialising ...

キーワード

Initialising ...

発表言語

Initialising ...

発行年

Initialising ...

開催年

Initialising ...

選択した検索結果をダウンロード

論文

Pulse shape discrimination in JSNS$$^2$$

百々 拓; 羽賀 勝洋; 原田 正英; 長谷川 勝一; 春日井 好己; 木下 秀孝; 増田 志歩; 明午 伸一郎; 酒井 健二; 鈴谷 賢太郎; et al.

Progress of Theoretical and Experimental Physics (Internet), 2025(2), p.023H02_1 - 023H02_8, 2025/02

https://doi.org/10.1093/ptep/ptaf016
 被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)

JSNS$$^2$$ (J-PARC Sterile Neutrino Search a t J-PARC Spallation Neutron Source) is an experiment that is searching for sterile neutrinos via the observation of $$bar{nu}_{mu} to bar{nu}_e$$ appearance oscillations using neutrinos from muon decay-at-rest. For this search, rejecting cosmic-ray-induced neutron events by Pulse Shape Discrimination (PSD) is essential because the JSNS$$^2$$ detector is located above ground, on the third floor of the building. We have achieved 94.95$$% pm 0.15%$$ rejection of neutron events while keeping 92.82$$% pm 1.77%$$ of signal, electron-like events using a data-driven likelihood method. This article will report the PSD technique using the full fiducial volume of the JSNS$$^2$$ detector.

論文

$$beta$$-delayed neutron spectroscopy of $$^{133}$$In

Xu, Z. Y.*; Madurga, M.*; Grzywacz, R.*; King, T. T.*; Algora, A.*; Andreyev, A. N.; 他43名*

Physical Review C, 108(1), p.014314_1 - 014314_9, 2023/07

https://doi.org/10.1103/PhysRevC.108.014314
 被引用回数：9 パーセンタイル：86.72(Physics, Nuclear)

Nuclei in the vicinity of doubly magic nuclei away from the line of $$beta$$ stability provide a tremendous testing ground to study the evolution of nuclear shell structure as a function of the unbalance between proton and neutron numbers. The decay $$^{133}$$In (Z=49, N=83), just one proton below and one neutron above doubly magic $$^{132}$$Sn, were studied at the ISOLDE Decay Station. Using the RILIS laser ion source, separate measurements of the 9/2$$^+$$ ground state and 1/2$$^-$$ isomer were carried out. With the use of $$beta$$-delayed neutron and $$gamma$$-ray spectroscopy, the decay strengths above the neutron separation energy were quantified for the first time. The spins and parities to the neutron-unbound states based were assigned based on the $$beta$$-decay selection rules, the log ft values, and systematics. The experimental findings greatly extend the current knowledge of the $$^{133}$$In decay from previous works, providing the $$beta$$-strength distribution southeast of $$^{132}$$Sn.

論文

Decay studies of the long-lived states in $$^{186}$$Tl

Stryjczyk, M.*; Andel, B.*; Andreyev, A. N.; Cubiss, J.*; Pakarinen, J.*; 他43名*

Physical Review C, 102(2), p.024322_1 - 024322_9, 2020/08

https://doi.org/10.1103/PhysRevC.102.024322
 被引用回数：4 パーセンタイル：36.67(Physics, Nuclear)

Decay spectroscopy of the long-lived states in $$^{186}$$Tl has been performed at ISOLDE, CERN. The $$alpha$$ decay from the low-spin (2$$^{-}$$) state in $$^{186}$$Tl was observed for the first time and a half-life was determined. Based on the $$alpha$$-decay energy, the relative positions of the long-lived states were fixed, with the (2$$^{-}$$) state as the ground state, the 7$$^{(+)}$$ state at 77(56) keV, and the 10$$^{(-)}$$ state at 451(56) keV. The level scheme of the internal decay of the $$^{186}$$Tl(10$$^{(-)}$$) state, which was known to decay solely through emission of 374-keV $$gamma$$-ray transition, was extended and a lower limit for the $$beta$$-decay branching b$$_{beta}$$ $$>$$ 5.9(3)% was determined. The extracted retardation factors for the $$gamma$$ decay of the 10$$^{(-)}$$ state were compared to the available data in neighboring odd-odd thallium isotopes indicating the importance of the $$pi$$d$$_{3/2}$$ shell in the isomeric decay and significant structure differences between $$^{184}$$Tl and $$^{186}$$Tl.

論文

Search for excited state of $$_{Sigma }^{4}{rm He}$$ 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

https://doi.org/10.7566/JPSCP.26.023005

The $$Sigma N$$ interaction is not much studied than the $$Lambda N$$ interaction. To understand the $$Sigma N$$ interaction, we study $$Sigma$$ hypernuclei. As for the $$Sigma$$ hypernucleus, only the ground state of $$_{Sigma }^{4}{rm He}$$ has been observed. To obtain more information about the $$Sigma N$$ interaction, the excited state should be studied. Therefore, we measure the missing-mass of the $$^4$$He$$(K^-,pi^-)$$ reaction at $$p_{K^-} = 1.5$$ GeV/$$c$$ and $$theta_{rm Lab} =$$ 2-14$$^{circ}$$ at the J-PARC K1.8 beam line. The ground state of $$_{Sigma }^{4}{rm He}$$ is observed whereas a peak of the excited states is not observed. We also observe suppression of the $$Sigma$$ quasi-free process at smaller angles.

論文

Cross section and transverse single-spin asymmetry of muons from open heavy-flavor decays in polarized $$p+p$$ collisions at $$sqrt{s}$$=200 GeV

Aidala, C.*; 長谷川 勝一; 今井 憲一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他431名*

Physical Review D, 95(11), p.112001_1 - 112001_15, 2017/06

AA2017-0235.pdf:0.72MB

https://doi.org/10.1103/PhysRevD.95.112001
 被引用回数：17 パーセンタイル：59.70(Astronomy & Astrophysics)

The cross section and transverse single-spin asymmetries of $$mu^-$$ and $$mu^+$$ from open heavy-flavor decays in polarized $$p+p$$ collisions at $$sqrt{s}$$ = 200 GeV were measured by the PHENIX experiment during 2012 at the Relativistic Heavy Ion Collider. Because heavy-flavor production is dominated by gluon-gluon interactions at $$sqrt{s}$$ = 200 GeV, these measurements offer a unique opportunity to obtain information on the trigluon correlation functions. The measurements are performed at forward and backward rapidity ($$1.4 < |y| < 2.0$$) over the transverse momentum range of $$1.25 < p_T < 7$$ GeV/$$c$$ for the cross section and $$1.25 < p_T < 5$$ GeV/$$c$$ for the asymmetry measurements. The obtained cross section is compared to a fixed-order-plus-next-to-leading-log perturbative-quantum-chromodynamics calculation. The asymmetry results are consistent with zero within uncertainties, and a model calculation based on twist-3 three-gluon correlations agrees with the data.

5 件中 1件目～5件目を表示
  • 1