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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

 被引用回数:1 パーセンタイル:25.8(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.


Search for $$alpha$$ decay of $$^{104}$$Te with a novel recoil-decay scintillation detector

Xiao, Y.*; Go, S.*; Grzywacz, R.*; Orlandi, R.; Andreyev, A. N.; 浅井 雅人; Bentley, M. A.*; de Angelis, G.*; Gross, C. J.*; Hausladen, P.*; et al.

Physical Review C, 100(3), p.034315_1 - 034315_8, 2019/09

 被引用回数:4 パーセンタイル:14.53(Physics, Nuclear)

A search for super-allowed $$alpha$$ decay of N=Z nuclei $$^{104}$$Te and $$^{108}$$Xe was carried out using a novel recoil-decay scintillator detector at the tandem accelerator facility at Japan Atomic Energy Agency. Inorganic crystal scintillation material of YAP:Ce (Yttrium Aluminium Perovskite) coupled to position-sensitive photo-multiplier tube (PSPMT) was implemented for the first time in a radioactive decay experiment. Residues from the fusion-evaporation reaction $$^{58}$$Ni+$$^{54}$$Fe$$rightarrow$$ $$^{112}$$Xe$$^*$$ were separated by the JAEA Recoil Mass Separator (RMS) and implanted into the YAP:Ce crystal. $$alpha$$ decays of neutron-deficient tellurium isotopes were identified and proton-emission of $$^{109}$$I was observed. No conclusive evidence was found for the decay chain $$^{108}$$Xe$$rightarrow$$$$^{104}$$Te$$rightarrow$$ $$^{100}$$Sn within 3 days experiment. The cross section limit of 130 pb was obtained for production of two events of $$^{108}$$Xe, about an order of magnitude below the expectation based on earlier cross section measurements and HIVAP calculations.


Local gas-liquid two-phase flow characteristics in rod bundle geometry

Xiao, Y.*; Shen, X.*; 三輪 修一郎*; 孫 昊旻; 日引 俊*

混相流シンポジウム2018講演論文集(インターネット), 2 Pages, 2018/08



Dynamics of stimulated L$$rightarrow$$H transitions

三木 一弘; Diamond, P. H.*; Hahn, S.-H.*; Xiao, W. W.*; G$"u$rcan, $"O$. D.*; Tynan, G. R.*

Physics of Plasmas, 20(8), p.082304_1 - 082304_11, 2013/08

 被引用回数:13 パーセンタイル:38.57(Physics, Fluids & Plasmas)



Thermal spin pumping and magnon-phonon-mediated spin-Seebeck effect

内田 健一*; 太田 岳*; 安立 裕人; Xiao, J.*; 野中 挙海*; 梶原 瑛祐*; Bauer, G. E. W.*; 前川 禎通; 齊藤 英治

Journal of Applied Physics, 111(10), p.103903_1 - 103903_11, 2012/05

 被引用回数:99 パーセンタイル:3.47(Physics, Applied)

The spin-Seebeck effect (SSE) in ferromagnetic metals and insulators has been investigated systematically by means of the inverse spin-Hall effect (ISHE) in paramagnetic metals. The SSE generates a spin voltage as a result of a temperature gradient in a ferromagnet, which injects a spin current into an attached paramagnetic metal. In the paramagnet, this spin current is converted into an electric field due to the ISHE, enabling the electric detection of the SSE. The observation of the SSE is performed in longitudinal and transverse configurations consisting of a ferromagnet/paramagnet hybrid structure, where thermally generated spin currents flowing parallel and perpendicular to a temperature gradient are detected, respectively.


Spin Seebeck insulator

内田 健一*; Xiao, J.*; 安立 裕人; 大江 純一郎; 高橋 三郎; 家田 淳一; 太田 岳*; 梶原 瑛祐*; 梅沢 浩光*; 河合 浩孝*; et al.

Nature Materials, 9(11), p.894 - 897, 2010/11

 被引用回数:804 パーセンタイル:0.13(Chemistry, Physical)

ゼーベック効果に代表される熱電発電は、次世代の省エネルギー技術には不可欠の機能である。これまでこの機能の発現には伝導電子の存在が必要であると思われてきたが、伝導電子の存在は熱デバイスの設計にとって不利であることが多いため、結果として伝導電子の存在が熱電発電の応用範囲を限定する原因となっていた。今回、われわれは絶縁体中を流れる熱流から電圧を生成することに成功したので、それを報告する。われわれが明らかにしたのは、磁性絶縁体LaY$$_{2}$$ Fe$$_{5}$$O$$_{12}$$が伝導電子を持たないのにもかかわらず、熱流をスピン圧に変換できるという事実である。このスピン圧は、LaY$$_{2}$$Fe$$_{5}$$O$$_{12}$$に貼付けられたPt薄膜中で生じる逆スピンホール効果を用いることで電圧に変換することができるため、熱流から電圧を生成することが可能となる。今回の実験結果を理解するためには、LaY$$_{2}$$Fe$$_{5}$$O$$_{12}$$とPtとの界面に働く、熱によるスピン交換相互作用を考える必要がある。われわれの発見は熱電変換素子となりうる物質の可能性を拡げ、そしてまたスピンゼーベック効果の背後に潜む物理を理解するための極めて重要な情報を与えた。


${it Arabidopsis thaliana}$ Y-family DNA polymerase $$eta$$ catalyses translesion synthesis and interacts functionally with PCNA2

Anderson, H.*; Vonarx, E.*; Pastushok, L.*; 中川 繭; 片渕 淳*; Gruz, P.*; Rubbo, A.*; Grice, D.*; Osmond, M.*; 坂本 綾子; et al.

Plant Journal, 55(6), p.895 - 908, 2008/09

 被引用回数:36 パーセンタイル:25.87(Plant Sciences)

We assessed the roles of ${it Arabidopsis thaliana}$ ${it POLH, PCNA1}$ and ${it PCNA2}$ in TLS mediated UV resistance. ${it Arabidopsis}$ ${it POLH}$ defective mutants sensitized growth of roots and whole plants to UV radiation indicating AtPol$$eta$$ contributes to UV resistance. ${it POLH}$ alone did not complement the UV sensitivity conferred by deletion of yeast ${it RAD30}$, although AtPol$$eta$$ exhibited cyclobutane dimer bypass activity and interacted with yeast PCNA in vitro. Co-expression of ${it POLH}$ and ${it PCNA2}$, but not ${it PCNA1}$, restored normal UV resistance and mutation kinetics in the ${it rad30}$ mutant. A single residue difference at site 201, which lies adjacent to the lysine ubiquitylated in PCNA, appeared responsible for the inability of PCNA1 to function with AtPol$$eta$$ in UV treated yeast. PCNA interacting protein boxes and an ubiquitin-binding motif in AtPol$$eta$$ were found to be required for restoration of UV resistance in the ${it rad30}$ mutant by ${it POLH}$ and ${it PCNA2}$. These observations indicate AtPol$$eta$$ can catalyse TLS past UV induced DNA damage, and link the biological activity of AtPol$$eta$$ in UV irradiated cells to PCNA2 and PCNA-and ubiquitin-binding motifs in AtPol$$eta$$.


Difference of results obtained with high and low Andersen sampler respectively in the research of atmospheric aerosols

Fu, F.; 渡部 和男; Wu, Y.*; Xiao, L.*; Xu, X.*; 篠原 伸夫

no journal, , 



Physics of stimulated and spontaneous L-H transitions

三木 一弘; Diamond, P. H.*; Hahn, S.-H.*; Xiao, W. W.*; G$"u$rcan, $"O$. D.*; Tynan, G. R.*

no journal, , 


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