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論文

International network of nuclear structure and decay data evaluators

Dimitriou, P.*; Basunia, S*; Bernstein, L.*; Chen, J.*; Elekes, Z.*; Huang, X.*; Hurst, A.*; 飯村 秀紀; Jain, A. K.*; Kelley, J.*; et al.

EPJ Web of Conferences, 239, p.15004_1 - 15004_4, 2020/09

BB2020-0008.pdf:0.34MB

https://doi.org/10.1051/epjconf/202023915004
 被引用回数：0 パーセンタイル：0.1(Nuclear Science & Technology)

評価済み核構造データファイル(Evaluated Nuclear Structure Data File: ENSDF)は、原子核構造と崩壊に関する様々な実験データを全ての核種について集めて、それらの実験データの評価値を与えてある世界唯一のデータファイルである。ENSDFは定期的に更新されており、そのための評価作業は各国の評価者で分担している。評価作業を速やかに行うために、IAEAの援助の下に評価者の国際的なネットワークが組織されている。この発表では、ネットワークの最近の活動のうち、ENSDFの処理コードの開発、測定が必要とされているデータのリストの作成、インターネット版核図表の利用の拡充などについて報告する。また、核構造・崩壊データの需要が増大しているにもかかわらず、評価者が減っている問題についても述べる。

論文

Nuclear data sheets for A=218

Singh, B.*; Basunia, M. S.*; Martin, M.*; McCutchan, E. A.*; Bara, I.*; Caballero-Folch, R.*; Canavan, R.*; Chakrabarti, R.*; Chekhovska, A.*; Grinder, M. M.*; et al.

Nuclear Data Sheets, 160, p.405 - 471, 2019/09

https://doi.org/10.1016/j.nds.2019.100524
 被引用回数：10 パーセンタイル：71.88(Physics, Nuclear)

The evaluated data are presented for 11 known A=218 nulcides (Pb, Bi, Po, At, Rn, Fr, Ra, Ac, Th, Pa and U). For $$^{218}$$Pb, $$^{218}$$Bi, $$^{218}$$At and $$^{218}$$Pa, data are available only for the ground states. For $$^{218}$$U, only the g.s. and a high-spin isomer are known, with no data on $$gamma$$-ray transitions available. For $$^{218}$$Po, ten excited states are known from $$^{218}$$Bi decay, with no knowledge on the multipolarities of gamma-ray transitions. For $$^{218}$$Th, five excited states in the g.s. band are known from an in-beam $$gamma$$-ray study. Data on level half-lives, multipolarities and mixing ratios of gamma transitions is generally lacking for A=218 nuclei. The static magnetic dipole moment has been measured for only an isomer in $$^{218}$$Fr. This evaluation was carried out as part of a joint IAEA-ICTP workshop for Nuclear Structure and Decay Data, organized and hosted by the IAEA, Vienna, and ICTP, Trieste, October 15-26, 2018.

論文

Spectroscopy of $$^{153}$$Gd and $$^{157}$$Gd using the ($$p,d gamma$$) reaction

Ross, T. J.*; Hughes, R. O.*; Allmond, J. M.*; Beausang, C. W.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Hurke, J. T.*; Casperson, R. J.*; Escher, J. E.*; et al.

Physical Review C, 90(4), p.044323_1 - 044323_12, 2014/10

https://doi.org/10.1103/PhysRevC.90.044323
 被引用回数：7 パーセンタイル：47.12(Physics, Nuclear)

Low-spin single quasi neutron levels in $$^{153}$$Gd and $$^{157}$$Gd have been studied following the $$^{154}$$Gd ($$p,d gamma$$) $$^{153}$$Gd and $$^{158}$$Gd ($$p,d gamma$$) $$^{157}$$Gd reactions. A combined Si telescope and high-purity germanium array was utilized, allowing $$d$$-$$gamma$$ and $$d$$-$$gamma$$-$$gamma$$ coincidence measurements. Almost all of the established low-excitation-energy, low-spin structures were confirmed in both $$^{153}$$Gd and $$^{157}$$Gd. Several new levels and numerous new $$gamma$$ rays are observed in both nuclei, particularly for $$Ex$$ $$geq$$ 1 MeV. Residual effects of a neutron sub shell closure at $$N$$ = 64 are observed in the form of a large excitation energy gap in the single quasi neutron level schemes.

論文

Remnants of spherical shell structures in deformed nuclei; The Impact of an $$N$$ = 64 neutron subshell closure on the structure of $$N$$ $${approx}$$ 90 gadolinium nuclei

Ross, T. J.*; Hughes, R. O.*; Beausang, C. W.*; Allmond, J. M.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Burke, J. T.*; Casperson, R. J.*; Escher, J. E.*; et al.

Physical Review C, 88(3), p.031301_1 - 031301_4, 2013/09

AA2013-0388.pdf:0.32MB

https://doi.org/10.1103/PhysRevC.88.031301
 被引用回数：7 パーセンタイル：48.08(Physics, Nuclear)

Odd-mass gadolinium isotopes around $$N$$ = 90 were populated by the ($$p,d$$) reaction, utilizing 25-MeV protons, resulting in population of low-spin quasi-neutron states at energies near and below the Fermi surface. Systematics of the single quasi-neutron levels populated are presented. A large excitation energy gap is observed between levels originating from the $$2d_{3/2}$$, $$1h_{11/2}$$ and $$3s_{1/2}$$ spherical parents (above the $$N$$ = 64 gap), and the $$2d_{5/2}$$ (below the gap) indicating that the spherical shell model level spacing is maintained at least to moderate deformations.

論文

Spectroscopy of $$^{88}$$Y by the ($$p,dgamma$$) reaction

Ross, T. J.*; Beausang, C. W.*; Hughes, R. O.*; Scielzo, N. D.*; Burke, J. T.*; Allmond, J. M.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Casperson, R. J.*; et al.

Physical Review C, 86(6), p.067301_1 - 067301_5, 2012/12

AA2012-0565.pdf:0.38MB

https://doi.org/10.1103/PhysRevC.86.067301
 被引用回数：3 パーセンタイル：22.73(Physics, Nuclear)

Low-spin, high-excitation energy states in $$^{88}$$Y have been studied using the $$^{89}$$Y($$p,dgamma$$) reaction. For this experiment a 25 MeV proton beam was incident upon a mono-isotopic $$^{89}$$Y target. A silicon telescope array was used to detect deuterons and coincident $$gamma$$ rays were detected using a germanium clover array. Most of the known low-excitation energy low-spin states populated strongly via the ($$p,d$$) reaction mechanism are confirmed. Two states are seen for the first time and seven new transitions, including one which by-passes the two low-lying isomeric states, are observed.

論文

Measurement of the entry-spin distribution imparted to the high excitation continuum region of gadolinium nuclei via ($$p$$,$$d$$) and ($$p$$,$$t$$) reactions

Ross, T. J.*; Beausang, C. W.*; Hughes, R. O.*; Allmond, J. M.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Burke, J. T.*; Casperson, R. J.*; Escher, J. E.*; et al.

Physical Review C, 85(5), p.051304_1 - 051304_5, 2012/05

AA2012-0155.pdf:0.62MB

https://doi.org/10.1103/PhysRevC.85.051304
 被引用回数：11 パーセンタイル：53.65(Physics, Nuclear)

代理反応法は、20%の精度でアクチニド核の中性子捕獲断面積を評価することができるが、希土類核に対しては、直接測定した中性子捕獲断面積と2$$sim$$3倍の不一致がある。これは、スピン/パリティの生成分布の違いによるものであると考えられる。このことを確かめるために、代理反応におけるガドリニウム核の角運動量移行の測定を行った。

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