検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年
検索結果: 11 件中 1件目~11件目を表示
  • 1

発表形式

Initialising ...

選択項目を絞り込む

掲載資料名

Initialising ...

発表会議名

Initialising ...

筆頭著者名

Initialising ...

キーワード

Initialising ...

使用言語

Initialising ...

発行年

Initialising ...

開催年

Initialising ...

選択した検索結果をダウンロード

論文

Complex chemistry with complex compounds

Eichler, R.*; 浅井 雅人; Brand, H.*; Chiera, N. M.*; Di Nitto, A.*; Dressler, R.*; D$"u$llmann, Ch. E.*; Even, J.*; Fangli, F.*; Goetz, M.*; et al.

EPJ Web of Conferences (Internet), 131, p.07005_1 - 07005_7, 2016/12

 パーセンタイル:100

近年、物理的な前段分離装置を活用することにより、超重元素の比較的不安定な単一分子の合成と研究が気相化学研究によって可能になった。非常に揮発性の高い106番元素のヘキサカルボニル錯体Sg(CO)$$_{6}$$の合成は最近の大きな成果である。この成功を受けて、中心金属原子と周囲の配位子間の第一乖離エネルギーの測定を第2世代の実験として実施した。管状の分解反応装置を用いた手法を開発し、短寿命のMo(CO)$$_{6}$$, W(CO)$$_{6}$$, Sg(CO)$$_{6}$$錯体に適用することに成功した。

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

 被引用回数:5 パーセンタイル:51.04(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

Distinguishing fissions of $$^{232}$$Th, $$^{237}$$Np and $$^{238}$$U with beta-delayed $$gamma$$ rays

Iyengar, A.*; Norman, E. B.*; Howard, C.*; Angell, C.; Kaplan, A.*; Ressler, J. J.*; Chodash, P.*; Swanberg, E.*; Czeszumska, A.*; Wang, B.*; et al.

Nuclear Instruments and Methods in Physics Research B, 304, p.11 - 15, 2013/06

 被引用回数:6 パーセンタイル:39.84(Instruments & Instrumentation)

Measurements of beta-delayed $$gamma$$-ray spectra following 14-MeV neutron-induced fissions of $$^{232}$$Th, $$^{238}$$U, and $$^{237}$$Np were conducted at Lawrence Berkeley National Laboratory's 88-Inch Cyclotron. Spectra were collected for times ranging from 1 minute to 14 hours after irradiation. Intensity ratios of $$gamma$$-ray lines were extracted from the data that allow identification of the fissioning isotope.

論文

Determining the $$^{239}$$Np($$n$$,$$f$$) cross section using the surrogate ratio method

Czeszumska, A.*; Angell, C.; Burke, J. T.*; Scielzo, N. D.*; Norman, E. B.*; Austin, R. A. E.*; Boutoux, G.*; Casperson, R. J.*; Chodash, P.*; Hughes, R. O.*; et al.

Physical Review C, 87(3), p.034613_1 - 034613_6, 2013/03

AA2012-0918.pdf:0.85MB

 被引用回数:11 パーセンタイル:32.05(Physics, Nuclear)

Neutron-induced fission cross section data are needed in various fields of applied and basic nuclear science. However, cross sections of short-lived nuclei are difficult to measure directly due to experimental constraints. The first experimental determination of the neutron-induced fission cross section of $$^{239}$$Np at non-thermal energies was performed. The Surrogate Ratio Method (SRM) was employed to indirectly deduce the $$^{239}$$Np($$n$$,$$f$$) cross section. The surrogate reactions used were $$^{236}$$U$$(rm ^3He,p)$$ and $$^{238}$$U$$(rm ^3He,p)$$ with the reference cross section given by the well-known $$^{239}$$Np($$n$$,$$f$$) cross section. The ratio of observed fission reactions resulting from the two formed compound nuclei, $$^{238}$$Np and $$^{240}$$Np, was multiplied by the directly-measured $$^{237}$$Np($$n$$,$$f$$) cross section to determine the$$^{239}$$Np($$n$$,$$f$$) cross section. The $$^{239}$$Np($$n$$,$$f$$) cross section was determined with an uncertainty ranging between 3 - 30% over the energy range of 0.2 - 20 MeV.

論文

$$beta$$-delayed fission of $$^{192,194}$$At

Andreyev, A. N.*; Antalic, S.*; Ackermann, D.*; Bianco, L.*; Franchoo, S.*; Heinz, S.*; He${ss}$berger, F. P.*; Hofmann, S.*; Huyse, M.*; Kalaninov$'a$, Z.*; et al.

Physical Review C, 87(1), p.014317_1 - 014317_8, 2013/01

 被引用回数:17 パーセンタイル:17.67(Physics, Nuclear)

By using the recoil-fission correlation technique, the exotic process of beta-delayed fission ($$beta$$DF) was unambiguously identified in the very neutron-deficient nuclei $$^{192,194}$$At in experiments at the velocity filter SHIP at Gesellschaft f$"u$r Schwerionenforschung (GSI). The upper limits for the total kinetic energy release in fission of $$^{194,196}$$Po, being the daughter of $$^{192,194}$$At after $$beta^{+}/EC$$ decay, were estimated. The possibility of an unusually high $$beta^{+}$$DF probability $$^{192}$$At is discussed.

論文

Spectroscopy of $$^{88}$$Y by the ($$p$$,$$d$$$$gamma$$) 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

 被引用回数:3 パーセンタイル:70.21(Physics, Nuclear)

Low-spin, high-excitation energy states in $$^{88}$$Y have been studied using the $$^{89}$$Y($$p$$,$$d$$$$gamma$$) 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

 被引用回数:10 パーセンタイル:38.18(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。

論文

The Reaction $$^{48}$$Ca+$$^{238}$$U $$rightarrow$$ $$^{286}$$112$$^{*}$$ studied at the GSI-SHIP

Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Burkhard, H. G.*; Comas, V. F.*; Dressler, R.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; He${ss}$berger, F. P.*; et al.

European Physical Journal A, 32(3), p.251 - 260, 2007/06

 被引用回数:202 パーセンタイル:0.36(Physics, Nuclear)

The fusion reaction of $$^{48}$$Ca projectiles with$$^{238}$$U target nuclei was studied at the velocity filter SHIP of GSI. Two decay chains were measured, which fully confirm data that were previously assigned to the isotope $$^{283}$$112 in experiments at the Flerov Laboratory in Dubna. Two other events are consistent with a 50 % spontaneous fission (SF) branch of this isotope. The mean value obtained for the half-life of $$^{283}$$112 is (6.9$$^{+6.9}_{-2.3}$$) s, the $$alpha$$ energy is (9.520$$pm$$0.015) MeV, and the total kinetic energy (TKE) of SF is (238$$pm$$14) MeV. The half-life of the $$alpha$$ decay daughter nucleus $$^{279}$$Ds is (0.18$$^{+0.32}_{-0.07}$$) s, and the TKE of SF is (210$$^{+32}_{-11}$$) MeV. The cross-section deduced from all four events is (0.72$$^{+0.58}_{-0.35}$$) pb, measured at an excitation energy of 34.6 MeV of the compound nucleus $$^{286}$$112.

論文

Doubly magic nucleus $$^{270}_{108}$$Hs$$_{162}$$

Dvorak, J.*; Br$"u$chle, W.*; Chelnokov, M.*; Dressler, R.*; D$"u$llmann, Ch. E.*; Eberhardt, K.*; Gorshkov, V.*; J$"a$ger, E.*; Kr$"u$cken, R.*; Kuznetsov, A.*; et al.

Physical Review Letters, 97(24), p.242501_1 - 242501_4, 2006/12

 被引用回数:117 パーセンタイル:4.05(Physics, Multidisciplinary)

超重核領域で理論的に予想されていた変形した二重魔法核$$^{270}_{108}$$Hs$$_{162}$$を初めて実験的に確認した。実験はドイツ重イオン研究所(GSI)で行った。$$^{248}$$Cm+$$^{26}$$Mg反応で合成されたHs同位体を、迅速気相化学分離法で選択に分離し、$$alpha$$壊変エネルギーとそれに伴う15事象の壊変連鎖から$$^{270}_{108}$$Hsを同定した。また$$alpha$$壊変エネルギーから$$Q_{alpha}$$値を$$9.02 pm 0.03$$と決定した。$$^{270}_{108}$$Hsの生成断面積は約3pbであった。

論文

$$alpha$$-decay of the new isotope $$^{187}$$Po; Probing prolate structures beyond the neutron mid-shell at N = 104

Andreyev, A. N.*; Antalic, S.*; Ackermann, D.*; Franchoo, S.*; He${ss}$berger, F. P.*; Hofmann, S.*; Huyse, M.*; Kojouharov, I.*; Kindler, B.*; Kuusiniemi, P.*; et al.

Physical Review C, 73(4), p.044324_1 - 044324_8, 2006/04

 被引用回数:29 パーセンタイル:13.82(Physics, Nuclear)

The new neutron-deficient isotope $$^{187}$$Po has been identified in the complete fusion reaction $$^{46}$$Ti+$$^{144}$$Sm $$rightarrow$$ $$^{187}$$Po+3n at the velocity filter SHIP of GSI. Striking features of the $$^{187}$$Po $$alpha$$ decay are the strongly-hindered decay to the spherical ground state and unhindered decay to a surprisingly low-lying deformed excited state at 286 keV in the daughter nucleus $$^{183}$$Pb. Based on the potential energy surface calculations, the $$^{187}$$Po ground state and the 286 keV excited state in $$^{183}$$Pb were interpreted as being of prolate origin.

論文

$$alpha$$-decay spectroscopy of the new isotope $$^{192}$$At

Andreyev, A. N.*; Antalic, S.*; Ackermann, D.*; Franchoo, S.*; He${ss}$berger, F. P.*; Hofmann, S.*; Huyse, M.*; Kojouharov, I.*; Kindler, B.*; Kuusiniemi, P.*; et al.

Physical Review C, 73(2), p.024317_1 - 024317_11, 2006/02

 被引用回数:20 パーセンタイル:20.91(Physics, Nuclear)

Decay properties of the new neutron-deficient nuclide $$^{192}$$At have been studied in the complete fusion reaction $$^{144}$$Sm($$^{51}$$V,3n)$$^{192}$$At at the velocity filter SHIP of GSI. Two isomeric states with half-lives of 88(6) ms and 11.5(6) ms, respectively, and with complex $$alpha$$-decay schemes were identified in $$^{192}$$At. The decay pattern of one of the isomers suggests that it is based on the oblate-deformed $$pi$$2f7/2 $$times$$ $$nu$$1i13/2 configuration, which confirms the expected onset of deformation in the At isotopes by approaching the neutron midshell at N=104.

11 件中 1件目~11件目を表示
  • 1