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Journal Articles

Multiple mechanisms in proton-induced nucleon removal at $$sim$$100 MeV/nucleon

Pohl, T.*; Sun, Y. L.*; Obertelli, A.*; Lee, J.*; G$'o$mez-Ramos, M.*; Ogata, Kazuyuki*; Yoshida, Kazuki; Cai, B. S.*; Yuan, C. X.*; Brown, B. A.*; et al.

Physical Review Letters, 130(17), p.172501_1 - 172501_8, 2023/04

 Times Cited Count:2 Percentile:90.46(Physics, Multidisciplinary)

We report on the first proton-induced single proton- and neutron-removal reactions from the neutron deficient $$^{14}$$O nucleus with large Fermi-surface asymmetry at $$sim$$100 MeV/nucleon. Our results provide the first quantitative contributions of multiple reaction mechanisms including the quasifree knockout, inelastic scattering, and nucleon transfer processes. It is shown that the inelastic scattering and nucleon transfer, usually neglected at such energy regime, contribute about 50% and 30% to the loosely bound proton and deeply bound neutron removal, respectively.

Journal Articles

Ten years of warming increased plant-derived carbon accumulation in an East Asian monsoon forest

Zhang, J.*; Kuang, L.*; Mou, Z.*; Kondo, Toshiaki*; Koarashi, Jun; Atarashi-Andoh, Mariko; Li, Y.*; Tang, X.*; Wang, Y.-P.*; Pe$~n$uelas, J.*; et al.

Plant and Soil, 481(1-2), p.349 - 365, 2022/12

 Times Cited Count:0 Percentile:24.8(Agronomy)

Journal Articles

Adsorption behavior of $$^{181}$$W and $$^{rm 93m}$$Mo as lighter homologues of seaborgium (Sg) in HF/HNO$$_{3}$$ on anion-exchange resin

Liang, X. H.*; Tsukada, Kazuaki; Toyoshima, Atsushi; Li, Z.*; Asai, Masato; Sato, Tetsuya; Sato, Nozomi; Nagame, Yuichiro

Journal of Radioanalytical and Nuclear Chemistry, 292(2), p.917 - 922, 2012/05

 Times Cited Count:8 Percentile:52.71(Chemistry, Analytical)

Adsorption of carrier-free radiotracers $$^{181}$$W and $$^{rm 93m}$$Mo produced in the $$^{181}$$Ta($$p$$, $$n$$) and $$^{rm nat}$$Nb($$p$$, $$n$$) reactions, respectively, on anion-exchange resin was studied in mixed solution of HF and HNO$$_{3}$$ in a concentration range of 10$$^{-4}$$ - 10$$^{-1}$$ M HF/0.1 M HNO$$_{3}$$. Distribution coefficients ($$K_{rm d}$$) of $$^{181}$$W and $$^{rm 93m}$$Mo at 70 $$^{circ}$$C showed the V-shaped variation with the minimum at around 10$$^{-1}$$ M HF/0.1 M HNO$$_{3}$$ although variation of the $$K_{rm d}$$ values for $$^{rm 93m}$$Mo was quite small compared with that for $$^{181}$$W. Formation of oxofluoro complexes for W and Mo is briefly discussed.

Journal Articles

Sulfate complexation of element 104, Rf, in H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solution

Li, Z.*; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Sato, Nozomi; Kikuchi, Takahiro; Nagame, Yuichiro; Sch$"a$del, M.; Pershina, V.*; et al.

Radiochimica Acta, 100(3), p.157 - 164, 2012/03

 Times Cited Count:12 Percentile:69.15(Chemistry, Inorganic & Nuclear)

Oral presentation

Sulfate complexation of element 104, Rf, in H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solution ([H$$^{+}$$] = 1.0 M)

Li, Z.; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Sato, Nozomi; Kikuchi, Takahiro; Sch$"a$del, M.*; Nagame, Yuichiro; Liang, X. H.*; et al.

no journal, , 

Cation-exchange behavior of $$^{261}$$Rf (T$$_{1/2}$$ = 78 s) produced in the $$^{248}$$Cm($$^{18}$$O, 5n) reaction was studied on a "one-atom-at-a-time" scale in H$$_{2}$$SO$$_{4}$$ (0.15-0.69 M)/HNO$$_{3}$$ mixed solutions ([H$$^{+}$$] = 1.0 M) using an automated ion-exchange separation apparatus coupled with the detection system for alpha-spectroscopy. It was found that adsorption probability (%ads) of $$^{261}$$Rf on cation-exchange resin decreases with increasing [HSO$$_{4}$$$$^{-}$$], showing a successive formation of its sulfate complexes. Rf exhibited much weaker formation of the complexes than the lighter homologues Zr and Hf, which is qualitatively in good agreement with theoretical calculations including relativistic effects.

Oral presentation

On-line isothermal gas chromatographic behavior of group-5 elements as homologues of Db

Sato, Tetsuya; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Kasamatsu, Yoshitaka*; Li, Z.; Sato, Nozomi; Kikuchi, Takahiro; Liang, X. H.*; Kaneya, Yusuke*; et al.

no journal, , 

To investigate chemical properties of the superheavy element dubnium (Db, Z = 105), we have so far developed an on-line isothermal gas chromatographic apparatus. In this work, the on-line experiments with group-5 elements, Nb and Ta, using short-lived isotopes $$^{rm 88}$$Nb and $$^{rm 170}$$Ta as the homologues of Db were carried out. We determined optimum conditions to produce volatile compounds of the elements. Under the obtained conditions, overall efficiencies of the volatile compounds were measured as a function of the isothermal temperature in chlorinating condition with mixture of nitrogen gas and the SOCl$$_{2}$$ vapor containing 1% oxygen. Based on the isothermal gas chromatographic behavior of them, it was found that Ta compounds would be less volatile than Nb ones.

Oral presentation

Cation-exchange behavior of element 104, Rf, in H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solution ([H$$^{+}$$] = 1.0 M)

Li, Z.; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Sato, Nozomi; Sch$"a$del, M.*; Nagame, Yuichiro; Liang, X. H.*; Kasamatsu, Yoshitaka*; et al.

no journal, , 

Cation-exchange behavior of $$^{261}$$Rf (T$$_{1/2}$$ = 78 s) produced in the $$^{248}$$Cm($$^{18}$$O,5n) reaction was studied on a "one-atom-at-a-time" scale in 0.15-0.69 M H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solutions ([H$$^{+}$$] = 1.0 M) using an automated ion-exchange separation apparatus coupled with a detection system for alpha-spectroscopy (AIDA). It was found that adsorption probabilities (%ads) of Rf on the cation-exchange resin decrease with increasing [HSO$$_{4}$$$$^{-}$$], showing successive formation of Rf sulfate complexes. Rf exhibits a weaker complex formation than the lighter homologues Zr and Hf.

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