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：　6 件中 1件目～6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

Fully strange tetraquark states with the exotic quantum numbers $$J^{PC}=0^{+-}$$ and $$2^{+1-}$$

Xi, H.-Z.*; Jiang, Y.-W.*; Chen, H.-X.*; 保坂 淳; Su, N.*

Physical Review D, 108(9), p.094019_1 - 094019_13, 2023/11

https://doi.org/10.1103/PhysRevD.108.094019
 被引用回数：5 パーセンタイル：54.07(Astronomy & Astrophysics)

$$J^{PC}=0^{+-}$$と$$2^{+1-}$$の量子数をもつ、ストレンジクォークのみからなるテトラクォークを理論的に調べた結果を報告する。前者および後者の質量はそれぞれ2.47GeV、3.07GeVであるなど、いくつかの予言値を得た。

論文

First observation of $$^{28}$$O

近藤 洋介*; Achouri, N. L.*; Al Falou, H.*; Atar, L.*; Aumann, T.*; 馬場 秀忠*; Boretzky, K.*; Caesar, C.*; Calvet, D.*; Chae, H.*; et al.

Nature, 620(7976), p.965 - 970, 2023/08

https://doi.org/10.1038/s41586-023-06352-6
 被引用回数：32 パーセンタイル：95.20(Multidisciplinary Sciences)

非常に中性子が過剰な原子核$$^{28}$$Oは、陽子、中性子ともに魔法数であることから古くからその性質に興味が持たれていたが、酸素の最後の束縛核$$^{24}$$Oよりも中性子が4個も多いため、これまで観測されてこなかった。この論文では、理化学研究所RIBFにて$$^{29}$$Fからの1陽子ノックアウト反応によって$$^{28}$$Oを生成し、そこから放出される中性子を測定することによって初めてその観測に成功した。核構造の観点からは、$$^{28}$$Oでは二重閉殻が保たれているか興味が持たれていたが、実験で得られた分光学的因子が殻模型計算で予言されて程度の大きいことから、閉殻構造をもたない可能性が高いことがわかった。

論文

Two-dimensional quantum universality in the spin-1/2 triangular-lattice quantum antiferromagnet Na$$_{2}$$BaCo(PO$$_{4}$$)$$_{2}$$

Sheng, J.*; Wang, L.*; Candini, A.*; Jiang, W.*; Huang, L.*; Xi, B.*; Zhao, J.*; Ge, H.*; Zhao, N.*; Fu, Y.*; et al.

Proceedings of the National Academy of Sciences of the United States of America, 119(51), p.e2211193119_1 - e2211193119_9, 2022/12

https://doi.org/10.1073/pnas.2211193119
 被引用回数：37 パーセンタイル：94.65(Multidisciplinary Sciences)

Although considerable progress has been made in the theoretical understanding of the low-dimensional frustrated quantum magnets, experimental realizations of a well-established scaling analysis are still scarce. This is particularly true for the two-dimensional antiferromagnetic triangular lattices. Owing to the small exchange strength, the newly discovered compound Na$$_{2}$$BaCo(PO$$_{4}$$)$$_{2}$$ provides a rare opportunity for clarifying the quantum criticality in an ideal triangular lattice with quantum spin S=1/2. In addition to the establishment of the complete phase diagrams, the spin Hamiltonian with a negligible interplane interaction has been determined through the spin wave dispersion in the polarized state, which is consistent with the observation of a two-dimensional quantum critical point with the Bose-Einstein condensation of diluted free bosons.

論文

Chirality memory stored in magnetic domain walls in the ferromagnetic state of MnP

Jiang, N.*; 新居 陽一*; 有沢 洋希*; 齊藤 英治; 大江 純一郎*; 小野瀬 佳文*

Physical Review Letters, 126(17), p.177205_1 - 177205_5, 2021/04

https://doi.org/10.1103/PhysRevLett.126.177205
 被引用回数：9 パーセンタイル：57.82(Physics, Multidisciplinary)

Chirality in a helimagnetic structure is determined by the sense of magnetic moment rotation. We found that the chiral information did not disappear even after the phase transition to the high-temperature ferromagnetic phase in a helimagnet MnP. The 2nd harmonic resistivity $$rho^{2mathrm{f}}$$, which reflects the breaking down of mirror symmetry, was found to be almost unchanged after heating the sample above the ferromagnetic transition temperature and cooling it back to the helimagnetic state. The application of a magnetic field along the easy axis in the ferromagnetic state quenched the chirality-induced $$rho^{2mathrm{f}}$$. This indicates that the chirality memory effect originated from the ferromagnetic domain walls.

論文

Electric current control of spin helicity in an itinerant helimagnet

Jiang, N.*; 新居 陽一*; 有沢 洋希*; 齊藤 英治; 小野瀬 佳文*

Nature Communications (Internet), 11, p.1601_1 - 1601_6, 2020/03

https://doi.org/10.1038/s41467-020-15380-z
 被引用回数：50 パーセンタイル：90.24(Multidisciplinary Sciences)

A helimagnet is a chiral magnet in which the direction of the magnetic moment spatially rotates in a plane perpendicular to the propagation vector. The sense of the rotation known as spin helicity is a robust degree of freedom of matter and may provide a new concept of magnetic memory if it can be electrically controlled and detected. Here we show that the helicity can be controlled by magnetic fields and electric currents in an itinerant helimagnet MnP. Second-harmonic resistivity measurements allow us to read out the controlled helicity. In contract to an insulating multiferroic magnet, in which spin rotation was shown to be controllable by an electric field, we achieve helicity manipulation by using an electric current in the conducting helimagnet. The controllability of the spin helicity may pave the way to new method of realizing magnetic memories based on the spin internal degrees of freedom.

論文

Fine structure in the $$alpha$$ decay of $$^{223}$$U

Sun, M. D.*; Liu, Z.*; Huang, T. H.*; Zhang, W. Q.*; Andreyev, A. N.; Ding, B.*; Wang, J. G.*; Liu, X. Y.*; Lu, H. Y.*; Hou, D. S.*; et al.

Physics Letters B, 800, p.135096_1 - 135096_5, 2020/01

https://doi.org/10.1016/j.physletb.2019.135096
 被引用回数：14 パーセンタイル：75.19(Astronomy & Astrophysics)

Fine structure in the $$alpha$$ decay of $$^{223}$$U was observed in the fusion-evaporation reaction $$^{187}$$Re($$^{40}$$Ar,p3n) by using fast digital pulse processing technique. Two $$alpha$$-decay branches of $$^{223}$$U feeding the ground state and 244 keV excited state of $$^{219}$$Th were identified by establishing the decay chain $$^{223}$$U$$rightarrow$$$$^{219}$$Th$$rightarrow$$$$^{215}$$Ra$$rightarrow$$$$^{211}$$Rn. The $$alpha$$-particle energy for the ground-state to ground-state transition of $$^{223}$$U was determined to be 8993(17) keV, 213 keV higher than the previous value, the half-life was updated to be 62$$^{+14}_{-10} mu$$s. Evolution of nuclear structure for $$N$$=131 even-$$Z$$ isotones from Po to U was discussed in the frameworks of nuclear mass and reduced $$alpha$$-decay width, a weakening octupole deformation in the ground state of $$^{223}$$U relative to its lighter isotones $$^{219}$$Ra and $$^{211}$$Th was suggested.

6 件中 1件目～6件目を表示
  • 1