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Reiser, J. T.*; Neeway, J. J.*; Cooley, S. K.*; Parruzot, B.*; Heredia-Langner, A.*; Gin, S.*; Thomas, M.*; Smith, N. J.*; Icenhower, J. P.*; Stone-Weiss, N.*; et al.
International Journal of Applied Glass Science, 16(4), p.e16707_1 - e16707_16, 2025/10
被引用回数：0 パーセンタイル：0.00(Materials Science, Ceramics)A new technique, termed the stirred-reactor coupon analysis (SRCA) method, has been developed to measure the rate of glass dissolution in forward-rate conditions. Monolithic glass coupons are partially masked with an inert material before placement in a large volume of well-mixed solution with known chemistry and temperature for a predetermined duration. After the test, the mask is removed, and the difference in step height between the protected area and the exposed corroded portions of the sample coupon is measured to determine the extent of glass dissolution. The step height is converted to a rate measurement using the test duration and glass density. Test parameters such as sample surface preparation and test duration were evaluated to determine their effects on the measured rates. Additionally, results from an interlaboratory study (ILS) consisting of 12 laboratories from 11 different institutions are presented, where each laboratory performed 12 independent tests. When removing experimental outlier data, the 95% reproducibility limits for the SRCA method has no statistical difference with previously published standardized test methods used to determine the forward rate of glass dissolution. Overall, this paper describes steps necessary to perform the test method and provides the statistical calculations to evaluate test accuracy.
Mo, 
Mo, and 
MoKumar, V.*; Chapman, R.*; Ollier, J.*; Orlandi, R.; Smith, J. F.*; Spohr, K.-M.*; Torres, D. A.*; Wady, P.*; 他10名*
Physical Review C, 110(4), p.044308_1 - 044308_18, 2024/10
被引用回数：6 パーセンタイル：62.36(Physics, Nuclear)Excited states of the molybdenum isotopes 
Mo were populated in two experiments which used fusion-fission and binary grazing reactions. In the first experiment, the GASP array of Ge detectors was used to detect 
rays from fusion-fission products from the 
S + 
Yb reaction at 230 MeV. In the multinucleon transfer experiment, a 530-MeV beam of 
Zr ions was incident on a thin 
Sn target; projectile-like ejectiles were detected and identified using the PRISMA magnetic spectrometer and their associated rays detected using the CLARA array of Clover detectors. Previously known bands were extended in all isotopes, and a new g
band was established in Mo. The observed level schemes were compared with shell-model calculations, which reproduce the general features of the energy spectrum of excited states of Mo, Mo, and Mo, although not in detail. For the h
negative-parity decay sequences of the three isotopes studied, evidence is presented for nuclear shape changes with increasing neutron number.
Nb isotopes; Evidence for shape coexistence in 
=58 NbKumar, V.*; Chapman, R.*; O'Donnell, D.*; Ollier, J.*; Orlandi, R.; Smith, J. F.*; Spohr, K.-M.*; Torres, D. A.*; 他13名*
Physical Review C, 108(4), p.044313_1 - 044313_19, 2023/10
被引用回数：7 パーセンタイル：57.06(Physics, Nuclear)The nuclear structure of neutron-rich niobium isotopes 
Nb were studied at the Legnaro National Laboratories using -ray spectroscopy. The isotopes were produced in two different experiments, either using multi-nucleon transfer reactions of Zr 530-MeV beam onto a Sn target, or via fusion-fission of S on Yb. The level schemes of these isotopes were extended respectively up to excitation energies of 4545, 5409, and 3814 keV. The structure of the low-lying states in these isotopes was interpreted and discussed in the context of shell-model calculations. In particular, for the Nb isotope (
=41, =58), the results indicate the presence of shape-coexistence at low-energies, which was observed for the first time in this isotope.
-
hybridization intertwined with anomalous ground state formation in the van der Waals itinerant magnet Fe
GeTe
山神 光平*; 藤澤 唯太*; Pardo-Almanza, M*; Smith, B. R. M.*; 角田 一樹; 竹田 幸治; 岡田 佳憲*
Physical Review B, 106(4), p.045137_1 - 045137_8, 2022/07
被引用回数：12 パーセンタイル：56.65(Materials Science, Multidisciplinary)FeGeTe is a van der Waals (vdW) coupled unconventional ferromagnetic metal with a high Curie temperature (
), exceeding 300 K. The formation of an anomalous ground state far below has attracted great interest, leading to a need to understand the spin-polarized electronic state near the Fermi energy (
) at low temperature. Despite recent extensive study, a microscopic understanding of the spin polarized electronic structure around has not been established yet due to the intrinsic complexity of both the crystal and band structures. In this work, we investigate the temperature dependence of element-specific soft X-ray magnetic circular dichroism (XMCD). Systematic temperature evolution in the XMCD signal from both magnetic Fe and its ligand Te is clearly observed. Importantly, the enhancement of the hybridization between Fe 3 and Te 5 states in the zero-magnetic field limit has been revealed. In light of the possible emergence of an exotic ground state, we discuss the temperature and magnetic field evolution of the element specific XMCD results.
加藤 匠馬*; 永岡 美佳; Guo, H.*; 藤田 博喜; 相田 卓*; Smith, R. L. Jr.*
Environmental Science and Pollution Research, 28(39), p.55725 - 55735, 2021/10
被引用回数：0 パーセンタイル：0.00(Environmental Sciences)本研究では、土壌中のSrを無添加でスクリーニングする方法の開発を目的として、模擬土壌(粘土鉱物のバーミキュライト,モンモリロナイト,カオリナイト)及び実際の土壌(照沼)に熱水浸出を行い、有機酸を生成した。安定ストロンチウム(SrCl
)を土壌に吸着させ、10種類の有機酸を用いて、水熱条件下(120
200
C)での模擬土壌からのSrの溶出量を0.3Mまで評価した。ストロンチウムを吸着したバーミキュライト(Sr-V)については、0.1Mのクエン酸が150C、1時間の処理でSrの溶出に有効であることがわかった。これらの結果をもとに、照沼土壌の有機物からの有機酸の生成について検討した。照沼土壌の水熱処理では、200C、0.5hの反応時間で最大量の有機酸が生成された。照沼土壌からのSrの溶出の可能性を確認するために、ストロンチウムを吸着した照沼土壌(Sr-S)を調べた。Sr-Sでは、200Cで0.5hの反応時間で水熱処理を行うと、室温でSrの40%が溶出し、土壌中のSrのスクリーニングに無添加の方法が使えることがわかった。無添加の水熱浸出法は、化学分析の第一段階で固体を焼成する必要がないため、土壌中の金属の日常的なモニタリングや緊急時の対応にも応用できる。
永岡 美佳; 藤田 博喜; 相田 卓*; Guo, H.*; Smith, R. L. Jr.*
Applied Radiation and Isotopes, 168, p.109465_1 - 109465_6, 2021/02
被引用回数：0 パーセンタイル：0.00(Chemistry, Inorganic & Nuclear)原子力施設周辺では、環境試料中の放射化学分析(環境モニタリング)が行われる。環境試料中の
, 
核種の前処理は、従来、酸を用いて有機物を分解し、
Sr, U, Pu等の対象核種を抽出する方法で行われている。そこで、酸の代わりに超臨界水を用いた環境に優しい新しい前処理法を開発した。本研究では、茨城県の土壌(黒ボク土)を用いて水熱前処理を行い、放射性Sr及びUの前処理を行った。その結果、Sr及びUの回収率はそれぞれ70%及び40%であった。また得られた回収率は、水の密度との相関関係にあることが分かった。開発した方法により、放射化学分析の前処理法における環境負荷を低減することができる。
-decay branching ratio of 
PtCubiss, J. G.*; Harding, R. D.*; Andreyev, A. N.; Althubiti, N.*; Andel, B.*; Antalic, S.*; Barzakh, A. E.*; Cocolios, T. E.*; Day Goodacre, T.*; Farooq-Smith, G. J.*; et al.
Physical Review C, 101(1), p.014314_1 - 014314_4, 2020/01
被引用回数：5 パーセンタイル：37.79(Physics, Nuclear)Ptの基底状態から娘核Osの基底状態への崩壊分岐比を0.52(5)%と、過去の値と比較してより高精度で再決定した。PtはCERN-ISOLDE実験施設においてHgを単離し、その崩壊孫核種として生成した。今回の結果を用いて導出した崩壊の換算崩壊幅は、中性子欠損Pt同位体の崩壊幅の系統性について新しい描像を与えることとなった。
Hg, 
Hg, 
Hg and 
HgWrzosek-Lipska, K.*; Rezynkina, K.*; Bree, N.*; Zieli
ska, M.*; Gaffney, L. P.*; Petts, A.*; Andreyev, A. N.; Bastin, B.*; Bender, M.*; Blazhev, A.*; et al.
European Physical Journal A, 55(8), p.130_1 - 130_23, 2019/08
被引用回数：20 パーセンタイル：79.52(Physics, Nuclear)The neutron-deficient mercury isotopes serve as a classical example of shape coexistence, whereby at low energy near-degenerate nuclear states characterized by different shapes appear. The electromagnetic structure of even-mass 
Hg isotopes was studied using safe-energy Coulomb excitation of neutron-deficient mercury beams delivered by the REX-ISOLDE facility at CERN. The population of 0
, 2, and 4
states was observed in all nuclei under study. Reduced 
matrix elements coupling populated yrast and non-yrast states were extracted, including their relative signs. These are a sensitive probe of shape coexistence and may be used to validate nuclear models. The experimental results are discussed in terms of mixing of two different configurations and are compared with three different model calculations: the Beyond Mean Field model, the Interacting Boson Model with configuration mixing and the General Bohr Hamiltonian. Partial agreement with experiment was observed, hinting to missing ingredients in the theoretical descriptions.
Sn and spin-orbit splitting in neutron-rich nucleiOrlandi, R.; Pain, S. D.*; Ahn, S.*; Jungclaus, A.*; Schmitt, K. T.*; Bardayan, D. W.*; Catford, W. N.*; Chapman, R.*; Chipps, K. A.*; Cizewski, J. A.*; et al.
Physics Letters B, 785, p.615 - 620, 2018/10
被引用回数：12 パーセンタイル：58.78(Astronomy & Astrophysics)Low-lying neutron-hole states in Sn were populated via the 
Sn(d,t) reaction at Oak Ridge National Laboratory. The triton angular distributions were compared to DWBA calculations and revealed spectroscopic factors compatible with a single-hole nature of the states populated. The data permit to determine the spin-orbit splitting of the strongly bound 
and 
neutron orbits below the shell gap, which was compared to the splitting of the weakly bound 3 and 2
orbits above the gap. The comparison revealed a smaller energy splitting of the 3 orbits. All splittings were reproduced using Woods-Saxon calculations, and the lower splitting of the 3 orbits was explained to arise from the large radial extent of the wavefunction and small value of the amplitude at the surface. This result is important to understand at a fundamental level the spin-orbit interaction, and its effects on neutron-rich nuclei.
-spectroscopy at an intense cold neutron beam facilityJentschel, M.*; Blanc, A.*; de France, G.*; K
ster, U.*; Leoni, S.*; Mutti, P.*; Simpson, G.*; Soldner, T.*; Ur, C.*; Urban, W.*; et al.
Journal of Instrumentation (Internet), 12(11), p.P11003_1 - P11003_33, 2017/11
被引用回数：48 パーセンタイル：84.80(Instruments & Instrumentation)A highly efficient array of high-purity germanium (HPGe) detectors was developed and operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of -rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10
ns
cm
at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM Clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr
:(Ce) detectors from the FATIMA collaboration.
-delayed fission of 
AmWilson, G. L.*; 武山 美麗*; Andreyev, A. N.; Andel, B.*; Antalic, S.*; Catford, W. N.*; Ghys, L.*; 羽場 宏光*; He
berger, F. P.*; Huang, M.*; et al.
Physical Review C, 96(4), p.044315_1 - 044315_7, 2017/10
被引用回数：13 パーセンタイル：61.08(Physics, Nuclear)The exotic decay process of -delayed fission has been studied in the neutron-deficient isotope Am at RIKEN, Japan. The Am nuclei were produced in the complete fusion reaction 
Pb(
Al,4n)Am and separated by using the GARIS gas-filled recoil ion separator. A lower limit for the -delayed fission probability larger than 0.30 was deduced, which so far is the highest value among all known nuclei exhibiting this decay mode.
Gaffney, L. P.*; Robinson, A. P.*; Jenkins, D. G.*; Andreyev, A. N.; Bender, M.*; Blazhev, A.*; Bree, N.*; Bruyneel, B.*; Butler, P.*; Cocolios, T. E.*; et al.
Physical Review C, 91(6), p.064313_1 - 064313_11, 2015/06
被引用回数：11 パーセンタイル：55.62(Physics, Nuclear)Radioactive ion beams of 
Rn were studied by means of low-energy Coulomb excitation at REX-ISOLDE, CERN. The electric-quadrupole (E2) matrix elements connecting the first excited 2
to the ground state of these nuclei was extracted, which permits to determine the collectivity of these isotopes, which in both cases is deduced to be weak, as expected from the low-lying level-energy scheme. Comparisons were also made with beyond-mean-field model calculations and the magnitude of the transitional quadrupole moments are well reproduced.
Ni; Spectroscopy of the N=49 isotope 
ZnOrlandi, R.; M
cher, D.*; Raabe, R.*; Jungclaus, A.*; Pain, S. D.*; Bildstein, V.*; Chapman, R.*; De Angelis, G.*; Johansen, J. G.*; Van Duppen, P.*; et al.
Physics Letters B, 740, p.298 - 302, 2015/01
被引用回数：35 パーセンタイル：85.91(Astronomy & Astrophysics)Single-neutron states in Zn have been populated using the reaction Zn(d,p) at REX-Isolde, CERN. The analysis reveals that the lowest excited states in Zn lie at approximately 1 MeV, and involve neutron orbits above the N=50 shell gap. A 5/2
configuration was assigned to the 983-keV state. Comparison with large-scale shell model calculations supports a robust neutron N=50 shell closure for Ni. These data constitute an important step towards the understanding the magicity of Ni and the structure of nuclei in the region.
value in KrR
gis, J.-M.*; Jolie, J.*; Saed-Samii, N.*; Warr, N.*; Pfeiffer, M.*; Blanc, A.*; Jentschel, M.*; Kster, U.*; Mutti, P.*; Soldner, T.*; et al.
Physical Review C, 90(6), p.067301_1 - 067301_4, 2014/12
被引用回数：24 パーセンタイル：77.81(Physics, Nuclear)A smooth onset of collectivity in 
Kr has been determined from reported and E(2
) values. This is in contrast to the sudden onset in even-even Zr, Mo, and Sr isotopes. Our objective was to complete the systematics by determining the value in Kr, which was produced by cold-neutron-induced fission of 
U. The lifetime of the 2 state in Kr was measured via the electronic 
timing technique using the EXILL and FATIMA spectrometers. Based on the measured mean lifetime of 
= 15(10) ps, the value of 13
W.u. in Kr is determined for the first time and the smooth onset of deformation in the even-even Kr isotopes beyond neutron number N=50 is confirmed.
H
松石 聡*; 半那 拓*; 村場 善行*; Kim, S. W.*; Kim, J. E.*; 高田 昌樹*; 社本 真一; Smith, R. I.*; 細野 秀雄*
Physical Review B, 85(1), p.014514_1 - 014514_6, 2012/01
被引用回数：47 パーセンタイル：82.82(Materials Science, Multidisciplinary)LnFeAsOH(
=lanthanoid)の1111型鉄系超伝導体を代表して、CeFeAsO(D,H) (
=0.0-0.48)で粉末中性子回折と放射光X線回折測定を行った。これらの結果は、出発物質の水素の種類に関係なく両方の試料でH
イオンが酸素サイトを占めていることを強く示唆している。
Chadwick, M. B.*; Herman, M.*; Oblo
insk
, P.*; Dunn, M. E.*; Danon, Y.*; Kahler, A. C.*; Smith, D. L.*; Pritychenko, B.*; Arbanas, G.*; Arcilla, R.*; et al.
Nuclear Data Sheets, 112(12), p.2887 - 2996, 2011/12
被引用回数：2537 パーセンタイル：99.99(Physics, Nuclear)原子力科学・技術の利用分野ための評価済み核データライブラリーENDF/B-VII.1を公開した。米国核データ評価委員会が中心となって評価・整備したこの最新ライブラリーは、前バージョン(ENDF/B-VII.0)公開以後に得られた原子核理論や実験に関する知見を反映した中性子断面積,共分散,核分裂収率や崩壊データ等を格納している。ライブラリーの主な更新内容は、核種数の拡大、共分散データの拡充、R行列理論に基づく軽核の共鳴パラメータ評価、中重核やアクチノイドデータの改訂等である。核外輸送コードMCNPによるベンチマーク解析を行った結果、臨界予測性能等のパフォーマンスが向上した。
Smith, M. S.*; Lingerfelt, E. J.*; Scott, J. P.*; Nesaraja, C. D.*; Chae, K.*; 小浦 寛之; Roberts, L. F.*; Hix, W. R.*; Bardayan, D. W.*; Blackmon, J. C.*
Proceedings of Science (Internet), 28, p.180_1 - 180_5, 2010/12
「天体核物理のためのコンピュータインフラストラクチャー」は、これまで天体物理シミュレーションにおける最新の核物理データの包含を能率化するように開発された。この「インフラストラクチャー」はnucastrodata.orgで自由にオンライン利用可能なコンピュータコードの集まりで、プラットホームに依存しないように構成されている。今回、原子核質量模型の可視化ツールにおいて反応・崩壊Q値、安定核種、魔法数、r過程経路などの表示/非表示など、新しい機能を追加し、利便性をより高めた。
MgDaecon, A. N.*; Smith, J. F.*; Freeman, S. J.*; Janssens, R. V. F.*; Carpenter, M. P.*; Hadinia, B.*; Hoffman, C. R.*; Kay, B. P.*; Lauritsen, T.*; Lister, C. J.*; et al.
Physical Review C, 82(3), p.034305_1 - 034305_7, 2010/09
被引用回数：24 パーセンタイル：75.92(Physics, Nuclear)Mgは、中性子数20の魔法数が消滅する「逆転の島」と呼ばれている領域の境界にあたり、その詳しい核構造は興味が持たれている。この研究では、アルゴンヌ国立研究所においてMgの励起状態を
C(
O,2)反応にて生成し、そこからの脱励起線を観測することによってエネルギー準位を構築した。その結果、励起エネルギー2-4MeV領域に魔法数消滅が起きないことを前提とした理論計算では得られない状態が複数観測された。モンテカルロ殻模型による大規模計算と比較したところ、これらの状態は、2個の中性子が中性子数20の殻ギャップを超えて励起した状態と対応させることができた。すなわち、Mgではかなり低い励起エネルギーに殻ギャップを超えた励起状態が存在することが明らかとなり、「逆転の島」の境界に属することがはっきりした。
Smith, M. S.*; Lingerfelt, E. J.*; Scott, J. P.*; Nesaraja, C. D.*; Hix, W. R.*; Chae, K.*; 小浦 寛之; Meyer, R. A.*; Bardayan, D. W.*; Blackmon, J. C.*; et al.
AIP Conference Proceedings 847, p.470 - 472, 2006/07
インターネット上で利用可能な天体核物理に関するコンピュータシステムのサイトを再構築した。これは、天体物理のシミュレーションを最新の原子核物理の結果を用いて行うように作成されたシステムで、URL: nucastrodata.orgから無料で利用可能である。Java言語を用いて作成されたシステムであり、Windows, Macintosh, Unixといったプラットホームに依存せず、数回のマウス操作で中性子捕獲反応率、原子核質量等といった核データの可視化や、p過程やr過程といった元素合成計算の結果をアニメーション動画として表示することを平易に行うことが可能である。今回の再構築で特に原子核質量の可視化及びr過程元素合成の動画化のシステムを新たに開発した。
Zn and the structure of NiOrlandi, R.; Mcher, D.*; Raabe, R.*; Jungclaus, A.*; Pain, S. D.*; Bildstein, V.*; Chapman, R.*; De Angelis, G.*; Johansen, J. G.*; Van Duppen, P.*; et al.
no journal, ,
Single-neutron states in the = 49 isotope Zn were populated in the Zn(d,p)Zn transfer reaction at REX-ISOLDE, CERN. The combined detection of protons ejected in the reaction and of rays emitted by Zn permitted the identification of the lowest-lying 5/2 and 1/2 excited states. The analysis of proton angular distributions links these states to a significant amount of single-particle strength around 1 MeV, and specifically to the 
d
and s
neutron orbits, which lie above the = 50 neutron shell gap. Comparison with large-scale-shell-model calculations supports a robust = 50 shell-closure for Ni. These data constitute a considerable step towards the understanding of the magicity of Ni and of the structure of isotopes in the region.
