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First Ionization Potentials of Fm, Md, No, and Lr: Verification of Filling-Up of 5f Electrons and Confirmation of the Actinide Series
/ Sato, Tetsuya K (JAEA, Ibaraki) ; Asai, Masato (JAEA, Ibaraki) ; Borschevsky, Anastasia (Groningen U.) ; Beerwerth, Randolf (Jena U., TPI) ; Kaneya, Yusuke (JAEA, Ibaraki) ; Makii, Hiroyuki (JAEA, Ibaraki) ; Mitsukai, Akina (JAEA, Ibaraki) ; Nagame, Yuichiro (JAEA, Ibaraki) ; Osa, Akihiko (JAEA, Ibaraki) ; Toyoshima, Atsushi (JAEA, Ibaraki) et al.
We report the first ionization potentials (IP1) of the heavy actinides, fermium (Fm, atomic number Z = 100), mendelevium (Md, Z = 101), nobelium (No, Z = 102), and lawrencium (Lr, Z = 103), determined using a method based on a surface ionization process coupled to an online mass separation technique in an atom-at-a-time regime. The measured IP1 values agree well with those predicted by state-of-the-art relativistic calculations performed alongside the present measurements. [...]
2018 - 5 p.
- Published in : J. Am. Chem. Soc. 140 (2018) 14609-14613
Fulltext: PDF;
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2.
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Geometry and physics of the Geant4 toolkit for high and medium energy applications
/ Apostolakis, J (CERN) ; Asai, M (SLAC) ; Bogdanov, A G (Moscow Phys. Eng. Inst.) ; Burkhardt, H (CERN) ; Cosmo, G (CERN) ; Elles, S (Annecy, LAPP) ; Folger, G (CERN) ; Grichine, V M (CERN ; Lebedev Inst.) ; Gumplinger, P (TRIUMF) ; Heikkinen, A (Helsinki Inst. of Phys.) et al.
The current status of the Geant4 toolkit and the recent developments for the geometry, electromagnetic and hadronic physics for medium and high energy are presented. The focus of many recent improvements of the toolkit are key applications including the simulation of large Hadron collider (LHC) experiments at CERN. [...]
2009 - 15 p.
- Published in : Radiat. Phys. Chem. 78 (2009) 859-873
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3.
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4.
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5.
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First ionization potential of the heaviest actinide lawrencium, element 103
/ Sato, Tetsuya K (JAEA, Ibaraki) ; Asai, Masato (JAEA, Ibaraki) ; Borschevsky, Anastasia (Groningen U.) ; Stora, Thierry (CERN ; Gottingen U.) ; Sato, Nozomi (JAEA, Ibaraki) ; Kaneya, Yusuke (JAEA, Ibaraki ; Ibaraki U., Grad. Sch. Sci. Eng.) ; Tsukada, Kazuaki (JAEA, Ibaraki) ; Düllmann, Christoph E (Helmholtz Inst., Mainz ; Darmstadt, GSI ; Mainz U., Inst. Kernphys.) ; Eberhardt, Klaus (Helmholtz Inst., Mainz ; Mainz U., Inst. Kernphys.) ; Eliav, Ephraim (Tel Aviv U.) et al.
The first ionization potential (IP1) of element 103, lawrencium (Lr), has been successfully determined for the first time by using a newly developed method based on a surface ionization process. The measured IP1 value is 4.9630.080.07 eV. [...]
2016 - 6 p.
- Published in : EPJ Web Conf. 131 (2016) 05001
Fulltext: PDF;
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6.
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Recent developments in G$_{EANT}$4
/ Allison, J (Geant4 Assoc. ; Manchester U.) ; Apostolakis, J (CERN) ; Lee, S B (Korea Elect. Res. Inst., Changwon) ; Amako, K (KEK, Tsukuba ; Geant4 Assoc.) ; Chauvie, S (PRATO, Italy) ; Mantero, A (Genoa U.) ; Shin, J I (Korea Elect. Res. Inst., Changwon) ; Toshito, T (KMI, Nagoya) ; Truscott, P R (QinetiQ) ; Yamashita, T (JAERI-RIKEN, Hyogo) et al.
G eant 4 is a software toolkit for the simulation of the passage of particles through matter. It is used by a large number of experiments and projects in a variety of application domains, including high energy physics, astrophysics and space science, medical physics and radiation protection. [...]
FERMILAB-PUB-16-447-CD.-
2016 - 40 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 835 (2016) 186-225
Fulltext: 10.1016_j.nima.2016.06.125 - PDF; openaccess_1-s2.0-S0168900216306957-main - PDF;
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7.
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Development of a He/CdI$_2$ gas-jet system coupled to a surface-ionization type ion-source in JAEA-ISOL: towards determination of the first ionization potential of Lr (Z = 103)
/ Sato, T K (JAEA, Ibaraki) ; Asai, M (JAEA, Ibaraki) ; Sato, N (JAEA, Ibaraki) ; Tsukada, K (JAEA, Ibaraki) ; Toyoshima, A (JAEA, Ibaraki) ; Ooe, K (Niigata U. (main)) ; Miyashita, S (Hiroshima U. (main)) ; Kaneya, Y (JAEA, Ibaraki ; Ibaraki U., Grad. Sch. Sci. Eng.) ; Osa, A (JAEA, Ibaraki) ; Schädel, M (JAEA, Ibaraki) et al.
We report on development of a gas-jet transport system coupled to a surface ionization ion-source in the JAEA-ISOL (Isotope Separator On-Line) system. As a new aerosol material for the gas-jet system, CdI2, which has a low boiling point of 713 °C, is exploited to prevent deposition of the aerosol material on the surface of the ion-source. [...]
2015
- Published in : J. Radioanal. Nucl. Chem. 303 (2015) 1253-1257
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8.
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Progress in Geant4 Electromagnetic Physics Modelling and Validation
/ Apostolakis, J (CERN) ; Asai, M (SLAC) ; Bagulya, A (Lebedev Inst.) ; Brown, J M C (Monash U.) ; Burkhardt, H (CERN) ; Chikuma, N (Tokyo U.) ; Cortes-Giraldo, M A (Seville U.) ; Elles, S (Annecy, LAPP) ; Grichine, V (Lebedev Inst.) ; Guatelli, S (Wollongong U.) et al.
In this work we report on recent improvements in the electromagnetic (EM) physics models of Geant4 and new validations of EM physics. Improvements have been made in models of the photoelectric effect, Compton scattering, gamma conversion to electron and muon pairs, fluctuations of energy loss, multiple scattering, synchrotron radiation, and high energy positron annihilation. [...]
2015 - 8 p.
- Published in : J. Phys.: Conf. Ser. 664 (2015) 072021
IOP Open Access article: PDF;
In : 21st International Conference on Computing in High Energy and Nuclear Physics, Okinawa, Japan, 13 - 17 Apr 2015, pp.072021
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9.
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Measurement of the first ionization potential of lawrencium (element 103)
/ Sato, T K (JAERI, Tokai) ; Asai, M (JAERI, Tokai) ; Borschevsky, A (Massey U., NZIAS ; Helmholtz Inst., Mainz) ; Stora, T (CERN) ; Sato, N (JAERI, Tokai) ; Kaneya, Y (JAERI, Tokai ; Ibaraki U., Grad. Sch. Sci. Eng.) ; Tsukada, K (JAERI, Tokai) ; Düllmann, Ch E (Helmholtz Inst., Mainz ; Darmstadt, GSI ; Mainz U., Inst. Kernchem.) ; Eberhardt, K (Helmholtz Inst., Mainz ; Mainz U., Inst. Kernchem.) ; Eliav, E (Tel Aviv U. (main)) et al.
The chemical properties of an element are primarily governed by the configuration of electrons in the valence shell. Relativistic effects influence the electronic structure of heavy elements in the sixth row of the periodic table, and these effects increase dramatically in the seventh row—including the actinides—even affecting ground-state configurations. [...]
2015
- Published in : Nature 520 (2015) 209-211
Nature's cover featuring the article: PDF; Preprint: PDF;
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10.
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Shell-Structure and Pairing Interaction in Superheavy Nuclei: Rotational Properties of the Z=104 Nucleus Rf-256
/ Greenlees, PT (Jyvaskyla U.) ; Rubert, J (Strasbourg, IPHC) ; Piot, J (Strasbourg, IPHC) ; Gall, B J P (Strasbourg, IPHC) ; Andersson, L L (Liverpool U.) ; Asai, M (JAEA, Ibaraki) ; Asfari, Z (Strasbourg, IPHC) ; Cox, D M (Liverpool U.) ; Dechery, F (DAPNIA, Saclay) ; Dorvaux, O (Strasbourg, IPHC) et al.
2012 - 5 p.
- Published in : Phys. Rev. Lett. 109 (2012) 012501
APS published version, local copy: PDF;
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