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論文

Unusual low-temperature ductility increase mediated by dislocations alone

Naeem, M.*; Ma, Y.*; Tian, J.*; Kong, H.*; Romero-Resendiz, L.*; Fan, Z.*; Jiang, F.*; Gong, W.; Harjo, S.; Wu, Z.*; et al.

Materials Science & Engineering A, 924, p.147819_1 - 147819_10, 2025/02

https://doi.org/10.1016/j.msea.2025.147819

被引用回数：5 パーセンタイル：84.60(Nanoscience & Nanotechnology)

Face-centered cubic (fcc) medium-/high-entropy alloys (M/HEAs) typically enhance strength and ductility at cryogenic temperatures via stacking faults, twinning, or martensitic transformation. However, in-situ neutron diffraction on VCoNi MEA at 15 K reveals that strain hardening is driven solely by rapid dislocation accumulation, without these mechanisms. This results in increased yield strength, strain hardening, and fracture strain. The behavior, explained by the Orowan equation, challenges conventional views on cryogenic strengthening in fcc M/HEAs and highlights the role of dislocation-mediated plasticity at low temperatures.

論文

Formation of clusters in dilute neutron-rich matter

田中純貴*; Yang, Z.*; Typel, S.*; 足立智*; Bai, S.*; van Beek, P.*; Beaumel, D.*; 藤川祐輝*; Han, J.*; Heil, S.*; et al.

Science, 371(6526), p.260 - 264, 2021/01

https://doi.org/10.1126/science.abe4688

被引用回数：87 パーセンタイル：99.29(Multidisciplinary Sciences)

ノックアウト反応を用いることで、中性子過剰な錫同位体の核表面でのクラスター形成を実験的に確かめた。実験で得られた、質量数とともに単調に減少するノックアウト断面積は理論による予言と非常に良く一致し、クラスター形成率と中性子スキン厚との関係を示唆している。

論文

Fine structure in the 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：15 パーセンタイル：76.30(Astronomy & Astrophysics)

Fine structure in the decay of $^{223}$ U was observed in the fusion-evaporation reaction $^{187}$ Re( $^{40}$ Ar,p3n) by using fast digital pulse processing technique. Two -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 $^{219}$ Th $^{215}$ Ra $^{211}$ Rn. The -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 =131 even- isotones from Po to U was discussed in the frameworks of nuclear mass and reduced -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.