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論文

Search for the 6$$alpha$$ condensed state in $$^{24}$$Mg using the $$^{12}$$C+$$^{12}$$C scattering

Fujikawa, Y.*; Kawabata, T.*; Adachi, S.*; 廣瀬 健太郎; 牧井 宏之; 西尾 勝久; Orlandi, R.; 洲嵜 ふみ; 他13名*

Physics Letters B, 848, p.133834_1 - 133834_6, 2024/01

https://doi.org/10.1016/j.physletb.2023.138384
 被引用回数：0 パーセンタイル：0.02(Astronomy & Astrophysics)

We searched for the 6$$alpha$$-condensed state in $$^{24}$$Mg by measuring the $$^{12}$$C+$$^{12}$$C scattering with the SAKRA Si detector array. By using the invariant-mass method for the detected 3$$alpha$$ particles, the inclusive cross sections for the $$^{12}$$C+$$^{12}$$C $$rightarrow$$ $$^{12}$$C(0$$^{+}_{2}$$) + X and $$^{12}$$C(3$$^{-}_{1}$$) + X reactions were determined. In both the inclusive $$^{12}$$C(0$$^{+}_{2}$$) + X channel and the exclusive $$^{12}$$C(0$$^{+}_{2}$$) + $$^{12}$$C(0$$^{+}_{1}$$) channel, the cross section peaked at E$$_{cm}$$ = 19.4 MeV, which correspond to the excitation energy of E$$_{x}$$ = 33.3 MeV in $$^{24}$$Mg. This 19.4-MeV state is a candidate for the 6$$alpha$$-condensed state

論文

Evolution of nuclear structure in the neutron-rich $$^{96,97,99}$$Nb isotopes; Evidence for shape coexistence in $$N$$=58 $$^{99}$$Nb

Kumar, 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

https://doi.org/10.1103/PhysRevC.108.044313
 被引用回数：0 パーセンタイル：0.02(Physics, Nuclear)

The nuclear structure of neutron-rich niobium isotopes $$^{96,97,98}$$Nb were studied at the Legnaro National Laboratories using $$gamma$$-ray spectroscopy. The isotopes were produced in two different experiments, either using multi-nucleon transfer reactions of $$^{96}$$Zr 530-MeV beam onto a $$^{124}$$Sn target, or via fusion-fission of $$^{36}$$S on $$^{176}$$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 $$^{99}$$Nb isotope ($$Z$$=41, $$N$$=58), the results indicate the presence of shape-coexistence at low-energies, which was observed for the first time in this isotope.

論文

Measurement of double-differential neutron yields for iron, lead, and bismuth induced by 107-MeV protons for research and development of accelerator-driven systems

岩元 大樹; 中野 敬太; 明午 伸一郎; 佐藤 大樹; 岩元 洋介; 杉原 健太*; 西尾 勝久; 石 禎浩*; 上杉 智教*; 栗山 靖敏*; et al.

EPJ Web of Conferences, 284, p.01023_1 - 01023_4, 2023/05

https://doi.org/10.1051/epjconf/202328401023
 被引用回数：0 パーセンタイル：0.21(Nuclear Science & Technology)

加速器駆動システム(ADS)の核特性予測精度の向上と京都大学臨界集合体実験装置(KUCA)におけるADS炉物理実験で用いる中性子源情報の取得を目的として、京都大学の固定磁場強集束(FFAG)加速器を用いた核データ測定実験プログラムを開始した。このプログラムの一環として、鉄,鉛及びビスマスに対する陽子入射二重微分中性子収量(TTNY)及び断面積(DDX)を測定した。測定では、真空チェンバ内に設置された標的試料に107MeVの陽子ビームを照射し、核反応によって標的から発生した粒子の信号を、小型の中性子検出器を用いて検出した。検出信号とFFAGキッカー電磁石の信号の時間差から飛行時間(TOF)を求め、ガンマ線の事象を波形弁別法によって除去して中性子事象をカウントすることで中性子のTOFスペクトルを求めた。得られた中性子のTOFスペクトルから、相対論的運動学によりTTNY及びDDXを求めた。実験で得られたTTNY及びDDXを、モンテカルロ輸送計算コードPHITSによる計算と比較し、PHITSに組み込まれた核反応モデル及び評価済み核データライブラリJENDL-4.0/HEの妥当性を検証するとともに、PHITSによる計算の予測精度を評価した。

論文

Measurement of 107-MeV proton-induced double-differential thick target neutron yields for Fe, Pb, and Bi using a fixed-field alternating gradient accelerator at Kyoto University

岩元 大樹; 中野 敬太; 明午 伸一郎; 佐藤 大樹; 岩元 洋介; 杉原 健太; 西尾 勝久; 石 禎浩*; 上杉 智教*; 栗山 靖敏*; et al.

Journal of Nuclear Science and Technology, 60(4), p.435 - 449, 2023/04

https://doi.org/10.1080/00223131.2022.2115423
 被引用回数：3 パーセンタイル：68.71(Nuclear Science & Technology)

加速器駆動核変換システム(ADS)の研究開発及び京都大学臨界実験装置(KUCA)におけるADS未臨界炉物理の基礎研究を目的として、固定磁場強収束(FFAG)加速器を用いて107MeV陽子による鉄、鉛及びビスマス標的に対する二重微分中性子収量(TTNY)を測定した。TTNYは8個の中性子検出器(各検出器は小型のNE213液体有機シンチレータと光電子増倍管より構成される)からなる中性子検出器システムを用いて飛行時間法により得られたものである。測定で得られたTTNYを、粒子・重イオン輸送コードシステム(PHITS)に組み込まれたモンテカルロ法に基づく核破砕反応モデル(INCL4.6/GEM, Bertini/GEM, JQMD/GEM, JQMD/SMM/GEM)及び評価済み高エネルギー核データライブラリ(JENDL-4.0/HE)による計算結果と比較した。JENDL-4.0/HEを含む比較対象のモデルは、検出器角度5度における高エネルギーピークを再現しないなどの特徴的な不一致が見られた。測定で得られたTTNYとPHITSによって評価した20MeV以下のエネルギー及び角度積分中性子収率を比較した結果、INCL4.6/GEMがKUCAにおけるADS炉物理実験のモンテカルロ輸送シミュレーションに適していることが示された。

論文

First spectroscopic study of odd-odd $$^{78}$$Cu

Pedersen, L. G.*; Sahin, E.*; G$"o$rgen, A.*; Bello Garrote, F. L.*; 角田 佑介*; 大塚 孝治*; 新倉 潤*; Orlandi, R.; 他59名*

Physical Review C, 107(4), p.044301_1 - 044301_10, 2023/04

https://doi.org/10.1103/PhysRevC.107.044301
 被引用回数：0 パーセンタイル：0.02(Physics, Nuclear)

Nuclei in the vicinity of $$^{78}$$Ni ($$Z$$=28, $$N$$=50) are important benchmarks to study the evolution of shell structure far from stability. Excited states in $$^{78}$$Cu were observed for the first time following the $$beta$$-decay of $$^{78}$$Ni, which was produced by in-flight fission of $$^{238}$$U. Using $$gamma$$-ray coincidences, a level scheme comprising eight excited states was built. Using the observed $$beta$$ feeding and the $$gamma$$-decay properties of the excited states, spin was tentatively assigned to 5 new states. In addition to the $$gamma$$-decaying states, an isomeric state with a lifetime of 3.8(4) ms was found to decay by internal conversion. By comparing the results with large scale shell model calculations, quantitative information about the proton-neutron interaction outside the doubly magic $$^{78}$$Ni core was obtained.

論文

New $$K$$ isomers in $$^{248}$$Cf

Orlandi, R.; 牧井 宏之; 西尾 勝久; 廣瀬 健太郎; 浅井 雅人; 塚田 和明; 佐藤 哲也; 伊藤 由太; 洲嵜 ふみ; 永目 諭一郎*; et al.

Physical Review C, 106(6), p.064301_1 - 064301_11, 2022/12

https://doi.org/10.1103/PhysRevC.106.064301
 被引用回数：1 パーセンタイル：33.4(Physics, Nuclear)

The nuclear structure of $$^{248}$$Cf produced by the $$^{18}$$O+$$^{249}$$Cf multinucleon transfer reaction was investigated using $$gamma$$-ray spectroscopy. Analysis of the $$gamma$$-ray spectrum of $$^{248}$$Cf revealed the presence of multiple long-lived (isomeric) excited states at low excitation energies. The energies and half-lives of the isomers contain information on the proton and neutron orbits in the heavy-element region and the deformation of atomic nuclei, and are important data to predict the properties of nuclei in the "island of stability".

論文

Measurement of 107-MeV proton-induced double-differential neutron yields for iron for research and development of accelerator-driven systems

岩元 大樹; 中野 敬太; 明午 伸一郎; 佐藤 大樹; 岩元 洋介; 石 禎浩*; 上杉 智教*; 栗山 靖敏*; 八島 浩*; 西尾 勝久; et al.

JAEA-Conf 2022-001, p.129 - 133, 2022/11

https://doi.org/10.11484/jaea-conf-2022-001

加速器駆動システム(ADS)の核特性予測精度の向上と京都大学臨界集合体実験装置(KUCA)におけるADS炉物理実験で用いる中性子源情報の取得を目的として、京都大学の固定磁場強集束(FFAG)加速器を用いた核データ測定実験プログラムを開始した。このプログラムの一環として、鉄に対する陽子入射二重微分中性子収量(TTNY)及び断面積(DDX)を測定した。測定では、真空チェンバ内に設置された鉄標的に107MeVの陽子ビームを照射し、核反応によって標的から発生した粒子の信号を、小型の中性子検出器を用いて検出した。検出信号とFFAGキッカー電磁石の信号の時間差から飛行時間(TOF)を求め、ガンマ線の事象を波形弁別法によって除去して中性子事象をカウントすることで中性子のTOFスペクトルを求めた。得られた中性子のTOFスペクトルから、相対論的運動学により鉄標的に対するTTNY及びDDXを求めた。

論文

Angular momentum transfer in multinucleon transfer channels of $$^{18}$$O + $$^{237}$$Np

田中 翔也*; 廣瀬 健太郎; 西尾 勝久; Kean, K. R.*; 牧井 宏之; Orlandi, R.; 塚田 和明; 有友 嘉浩*

Physical Review C, 105(2), p.L021602_1 - L021602_5, 2022/02

https://doi.org/10.1103/PhysRevC.105.L021602
 被引用回数：1 パーセンタイル：33.4(Physics, Nuclear)

The angular momentum of a primary excited compound nucleus produced in multinucleon transfer reaction is an important quantity to evaluate cross sections to synthesize neutron-rich heavy element nuclei as well as for surrogate reaction studies. The mechanism is, however, not enough understood due to the lack of detailed experimental data. In the present study, we determined the angular momentum of primary excited nuclei, $$^{237,238,239}$$Np, $$^{238,239,240}$$Pu, and $$^{239,240,241}$$Am, produced in the multi-nucleon transfer channels of the $$^{18}$$O + $$^{237}$$Np reaction. With this aim, angular distributions of fission fragments with respect to the axis perpendicular to the reaction plane were measured for each compound nucleus. The distributions show an anisotropy exhibiting an enhanced yield on the reaction plane. They are well reproduced by a saddle point model, from which the average angular momentum is derived in the model framework. The angular momentum increases with the compound-nucleus mass, thus the number of nucleons exchanged, but shows a saturating trend toward heavier compound nuclei. These results are the first ones to point to the dependence of the angular momentum on the transfer channels.

論文

$$gamma$$-ray spectroscopy of low-lying yrast and non-yrast states in neutron-rich $$^{94,95,96}$$Kr

Gerst, R.-B.*; Blazhev, A.*; Moschner, K.*; Doornenbal, P.*; Obertelli, A.*; Orlandi, R.; 他62名*

Physical Review C, 105(2), p.024302_1 - 024302_11, 2022/02

https://doi.org/10.1103/PhysRevC.105.024302
 被引用回数：6 パーセンタイル：82.52(Physics, Nuclear)

The neutron rich krypton isotopes $$^{94,95,96}$$Kr ($$Z$$=36, $$N$$=58,59,60 respectively) were investigated at the Radioactive Isotope Beam Facility Facility (RIBF) at RIKEN. The nuclei of interest were produced in nuclear reactions induced by radioactive Kr and Rb beams, prduced via in-flight fission of $$^{238}$$U, impinging onto the liquid hydrogen target MINOS. The main reactions occurring were (p,pn), (p,p') and (p,2p). The isotopes of interest were separated in the fragment separator BigRIPS, and their $$gamma$$ rays detected using the DALI2 $$gamma$$-ray spectrometer. The $$^{94,95,96}$$Kr provide insights onto the sudden onset of deformation occurring in Zr and Mo isotopes at $$N$$=60, which is also associated with shape coexistence. In this experiment the level scheme of these isotopes could be extended, and new yrast and non-yrast states were identified. The results were compared with predictions of the "beyond-mean-field" model and the IBM model, and indications of prolate-oblate shape coexistence at $$N$$=60 in the Kr isotopes was found.

論文

The $$^{59}$$Fe(n,$$gamma$$)$$^{60}$$Fe cross section from the surrogate ratio method and its effect on the $$^{60}$$Fe nucleosynthesis

Yan, S. Q.*; Li, X. Y.*; 西尾 勝久; Lugaro, M.*; Li, Z. H.*; 牧井 宏之; Pignatari, M.*; Wang, Y. B.*; Orlandi, R.; 廣瀬 健太郎; et al.

Astrophysical Journal, 919(2), p.84_1 - 84_7, 2021/10

https://doi.org/10.3847/1538-4357/ac12ce
 被引用回数：1 パーセンタイル：8.87(Astronomy & Astrophysics)

The long-lived $$^{60}$$Fe (with a half-life of 2.62 Myr) is a crucial diagnostic of active nucleosynthesis in the Milky Way galaxy and in supernovae near the solar system. The neutron-capture reaction $$^{59}$$Fe(n,$$gamma$$)$$^{60}$$Fe on $$^{59}$$Fe (half-life=44.5 days) is the key reaction for the production of $$^{60}$$Fe in massive stars. This reaction cross section has been previously constrained by the Coulomb dissociation experiment, which offered partial constraint on the E1 $$gamma$$-ray strength function but a negligible constraint on the M1 and E2 components. In this work, for the first time, we use the surrogate ratio method to experimentally determine the $$^{59}$$Fe(n,$$gamma$$)$$^{60}$$Fe cross sections in which all the components are included. We derived a Maxwellian-averaged cross section of 27.5$$pm$$3.5 mb at $$kT$$ = 30 keV and 13.4$$pm$$1.7 mb at $$kT$$ = 90 keV, roughly 10%-20% higher than previous estimates. We analyzed the impact of our new reaction rates in nucleosynthesis models of massive stars and found that uncertainties in the production of $$^{60}$$Fe from the $$^{59}$$Fe(n,$$gamma$$)$$^{60}$$Fe rate are at most 25$$%$$. We conclude that stellar physics uncertainties now play a major role in the accurate evaluation of the stellar production of $$^{60}$$Fe.

論文

Transition probabilities in $$^{31}$$P and $$^{31}$$S; A Test for isospin symmetry

Tonev, D.*; De Angelis, G.*; Deloncle, I.*; Orlandi, R.; 他27名*

Physics Letters B, 821, p.136603_1 - 136603_6, 2021/10

https://doi.org/10.1016/j.physletb.2021.136603
 被引用回数：5 パーセンタイル：65.12(Astronomy & Astrophysics)

The mirror nuclei $$^{31}$$P and $$^{31}$$S, produced via the $$^{20}$$Ne+$$^{12}$$C reaction at 33 MeV, were studied at Legnaro Laboratory using the EUCLIDES Si array coupled with the GASP Ge array. The observed B(E1) strengths of mirror E1 transitions, provide strong evidence for breaking of isospin symmetry in the A=31 mass region. The new finding are supported and explained by state-of-the-art beyond-mean-field calculations including 2- and 3-body forces. According to these findings, the breaking of isospin symmetry originate from violation of charge symmetry in the 2- and 3-body parts of the Coulomb potential.

論文

Nuclear structure of Te isotopes beyond neutron magic number $$N$$ = 82

Moon, B.*; Jungclaus, A.*; Na$"i$dja, H.*; Gargano, A.*; Lozeva, R.*; Moon, C.-B.*; Orlandi, R.; 他66名*

Physical Review C, 103(3), p.034320_1 - 034320_15, 2021/03

https://doi.org/10.1103/PhysRevC.103.034320
 被引用回数：7 パーセンタイル：76.16(Physics, Nuclear)

At RIKEN RIBF facility, the beta decay of $$^{137}$$Sb and $$^{138}$$Sb were studied and several new excited states were assigned to the level schemes of $$^{137}$$Te and $$^{138}$$Te. The structure of these Te isotopes deduced from the level scheme is compared with state-of-the-art shell-model calculations using different effective interactions. The comparison with calculations permits to determine the spectroscopic factors and deformation of these isotopes close to doubly magic $$^{132}$$Sn.

論文

Experimental study of the $$Gamma_{p1}/Gamma_{p0}$$ ratios of resonance states in $$^{8}$$Be for deducing the $$^{7}$$Be($$n$$,$$p_{1}$$)$$^{7}$$Li$$^{*}$$ reaction rate relevant to the cosmological lithium problem

岩佐 直仁*; 石川 竣喜*; 久保野 茂*; 榊原 昂浩*; 小湊 和也*; 西尾 勝久; 松田 誠; 廣瀬 健太郎; 牧井 宏之; Orlandi, R.; et al.

Physical Review C, 103(1), p.015801_1 - 015801_5, 2021/01

https://doi.org/10.1103/PhysRevC.103.015801
 被引用回数：1 パーセンタイル：18.91(Physics, Nuclear)

The $$^{9}$$Be($$^{3}$$He,$$alpha$$)$$^{8}$$Be($$p$$)$$^{7}$$Li reaction was studied at $$E_{rm lab}$$($$^{3}$$He)=30 MeV to deduce the branching ratios of $$Gamma_{p1}/Gamma_{p0}$$ of resonant state at 18.91 - 20.1 MeV in $$^{8}$$Be, which are necessary to extract the $$^{7}$$Be($$n$$, $$p_{1}$$)$$^{7}$$Li$$^{*}$$ reaction rate relevant to the $$^{7}$$Be destruction in the big bang nucleosynthesis, from the $$^{7}$$Li($$p$$,$$n_{0}$$)$$^{7}$$Be reaction cross section. The decay protons from $$^{8}$$Be$$^{*}$$ to the ground and first excited states in $$^{7}$$Li were well-separately measured. The $$Gamma_{p1}/Gamma_{p0}$$ ratio of the 19.235-MeV state was deduced to be 3.4$$pm$$1.9%. The 19.86- and 20.1-MeV states were found to decay dominantly into the first excited and ground states of $$^{7}$$Li, respectively.

論文

Measurement of fission-fragment mass distributions in the multinucleon transfer channels of the $$^{18}$$O+$$^{237}$$Np reaction

Vermeulen, M. J.; 西尾 勝久; 廣瀬 健太郎; Kean, K. R.; 牧井 宏之; Orlandi, R.; 塚田 和明; Tsekhanovich, I.*; Andreyev, A. N.; 石崎 翔馬*; et al.

Physical Review C, 102(5), p.054610_1 - 054610_11, 2020/11

https://doi.org/10.1103/PhysRevC.102.054610
 被引用回数：5 パーセンタイル：52.72(Physics, Nuclear)

Fission fragment mass distributions for 23 nuclei ($$^{234-237}$$U, $$^{236-239}$$Np, $$^{238-241}$$Pu, $$^{240-243}$$Am, $$^{242-245}$$Cm, and $$^{244-246}$$Bk) were measured using the multi-nucleon transfer approach in the reaction of $$^{18}$$O+$$^{237}$$Np, and their excitation-energy dependence was obtained up to a maximum of 70 MeV. Among them, the low energy fission of $$^{236}$$Np, $$^{238}$$Pu, and $$^{245}$$Cm is reported for the first time. The experimental data for all the studied nuclei were compared to the Langevin calculations. The calculation which takes into account the effects of multi-chance fission well reproduced the peak-to-valley ratio and mass-asymmetric peak positions of the distributions. The angular momenta given to the fissioning nucleus is also discussed.

論文

Evolution of proton single-particle states in neutron-rich Sb isotopes beyond $$N$$=82

Jungclaus, A.*; Keatings, J. M.*; Simpson, G. S.*; Orlandi, R.; 他47名*

Physical Review C, 102(3), p.034324_1 - 034324_11, 2020/09

https://doi.org/10.1103/PhysRevC.102.034324
 被引用回数：5 パーセンタイル：52.72(Physics, Nuclear)

The $$beta$$ decay of $$^{136,137,138}$$Sn was investigated at RIBF, RIKEN. For $$^{137}$$Sb the first information on excited states was obtained. In the case of $$^{136}$$Sb and $$^{138}$$Sb, new gamma-rays were observed. The new experimental results, in combination with state-of-the-art shell-model calculations, provide the first information on the evolution of the 0g$$_{7/2}$$and 1d$$_{5/2}$$ proton single-particle states with increasing neutron number beyond $$N$$=84.

論文

$$beta$$ decay of $$^{75}$$Ni and the systematics of the low-lying level structure of neutron-rich odd-$$A$$ Cu isotopes

Bello Garrote, F. L.*; Sahin, E.*; 角田 佑介*; 大塚 孝治*; G$"o$rgen, A.*; Orlandi, R.; 他61名*

Physical Review C, 102(3), p.034314_1 - 034314_13, 2020/09

https://doi.org/10.1103/PhysRevC.102.034314
 被引用回数：4 パーセンタイル：45.12(Physics, Nuclear)

Detailed spectroscopy of neutron-rich odd-$$A$$ Cu isotopes is of great importance for studying the shell evolution in the region of $$^{78}$$Ni. Excited states in $$^{75}$$Cu were populated in the $$beta$$ decay of $$^{75}$$Ni isotopes, which were produced by the in-flight fission at RIBF, RIKEN. The $$^{75}$$Ni isotopes were separated, identified, and implanted in a highly segmented Si detector array for the detection of the $$beta$$-decay electrons, while the delayed $$gamma$$ rays were detected by an array of HPGe cluster detectors. A level scheme of $$^{75}$$Cu was built up to $$sim$$4 MeV, from which the location of the two previously known low-lying isomeric states was clarified. The level structure below 2 MeV was interpreted based on the results of the shell-model calculations and the systematics of odd-$$A$$ Cu isotopes, revealing the evolution of single-particle states in this region.

論文

Transition strengths in the neutron-rich $$^{73,74,75}$$Ni isotopes

Gottardo, A.*; De Angelis, G.*; Doornenbal, P.*; Coraggio, L.*; Gargano, A.*; Itaco, N.*; Orlandi, R.; 他52名*

Physical Review C, 102(1), p.014323_1 - 014323_8, 2020/07

https://doi.org/10.1103/PhysRevC.102.014323
 被引用回数：8 パーセンタイル：69.78(Physics, Nuclear)

Reduced transition probabilities have been measured for the neutron-rich $$^{73,74,75}$$Ni nuclei with relativistic Coulomb excitation performed at the RIKEN Nishina Center. Excitation energies compare well with the result of large-scale shell-model calculations, while $$B(E2)$$ values are larger than predicted. This could indicate an increasing contribution of proton excitations across the $$Z=28$$ shell closure when approaching $$^{78}$$Ni.

論文

Sequential nature of ($$p,3p$$) two-proton knockout from neutron-rich nuclei

Frotscher, A.*; G$'o$mez-Ramos, M.*; Obertelli, A.*; Doornenbal, P.*; Authelet, G.*; 馬場 秀忠*; Orlandi, R.; 他86名*

Physical Review Letters, 125(1), p.012501_1 - 012501_7, 2020/07

https://doi.org/10.1103/PhysRevLett.125.012501
 被引用回数：5 パーセンタイル：38.78(Physics, Multidisciplinary)

Twenty-one two-proton ($$p,3p$$) knock-out cross sections of neutron-rich radioactive isotopes were measured in inverse kinematics using the MINOS time-projection chamber at RIBF, RIKEN. The proton angular distributions, measured for the first time, reveal that the reaction kinematics of the ($$p,3p$$) reaction is consistent with sequential proton collisions within the projectile nucleus.

論文

最先端の研究開発,日本原子力研究開発機構,3; 原子科学の最先端を拓く

Orlandi, R.; 廣瀬 健太郎; 矢板 毅; 山上 浩志; 家田 淳一; 神戸 振作; 石川 法人

日本原子力学会誌ATOMO$$Sigma$$, 62(5), p.280 - 284, 2020/05

https://doi.org/10.3327/jaesjb.62.5_280

先端基礎研究センターで行っている研究を紹介する。(1)人工元素アインスタイニウムを用いた実験(安定の島に向かう超重原子核の核分裂と電子軌道のイオン半径)、(2)電子のスピンを駆使した新しいエネルギー変換仕組み、(3)磁場に負けない超伝導、(4)放射線環境中のセラミックスがもつ自己修復能力

論文

New excited 2$$^+$$ and 3$$^-$$ two-proton states in $$_{84}^{210}$$Po$$_{126}$$ populated by two-proton transfer

Dupont, E.*; Astier, A.*; Petrache, C. M.*; Lv, B. F.*; Deloncle, I.*; Kiener, J.*; Orlandi, R.; 牧井 宏之; 西尾 勝久; 廣瀬 健太郎; et al.

Physical Review C, 101(1), p.014309_1 - 014309_6, 2020/01

https://doi.org/10.1103/PhysRevC.101.014309
 被引用回数：1 パーセンタイル：13.56(Physics, Nuclear)

Five new 2$$^+$$ levels and one new 3$$^-$$ level were established in $$^{210}$$Po. The states were populated via the $$^{208}$$Pb($$^{12}$$C, $$^{10}$$Be) two-proton reaction experiment, performed at the JAEA Tandem in Tokai. A setup combining Ge, LaBr$$_3$$, and Si telescopes was used to detect in-beam $$gamma$$-rays and ejectile residues. Two-proton configurations were assigned to all new states. All assignments are strongly supported by shell-model calculations.

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