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Journal Articles

Charge radii in modern macroscopic-microscopic mass models; The Role of dynamic quadrupole deformation

Iimura, Hideki; Buchinger, F.*

European Physical Journal A, 42(3), p.559 - 563, 2009/12

 Times Cited Count:1 Percentile:13.08(Physics, Nuclear)

For the nuclei where axially asymmetric or reflection-asymmetric shapes are expected, we calculated the nuclear charge radii by using the Finite Range Droplet Model. As a result, we found the agreement between the experimental and theoretical radii becomes better when these asymmetries are taken into account in the model calculation. In addition, we developed a method to empirically calculate the charge radii of even-even nuclei. This method is based on the Finite Range Liquid Drop Model, and use the experimental ${it B}$(${it E}$2) value or the excitation energy of the first excited 2$$^{+}$$ state as input parameters.

Oral presentation

Visualization, analyis, and management of nuclear mass information at nucearmasses.org

Smith, M. S.*; Lingerfelt, E. J.*; Buckner, K.*; Nesaraja, C. D.*; Koura, Hiroyuki; Kondev, F.*

no journal, , 

We have built the first and only online suite of codes that enables researchers to quickly and efficiently manage, visualize, access, manipulate, share, compare, and analyze nuclear masses. Our system, freely available at nuclearmasses.org, is a platform-independent client-server application that accommodates the latest mass measurements, theoretical models of nuclear masses, and large tables of evaluated nuclear masses. There is a strong need for this service, because of (1) the widespread utilization of nuclear masses in basic and applied science, (2) the tremendous growth in mass measurement capabilities, facilities, and new results, and (3) the inadequacy of existing systems that disseminate nuclear mass information. With our system, researchers can upload their own mass datasets, store them, share them with colleagues, and quickly and easily visualize them in customizable one- and two-dimensional plots.

Oral presentation

Global properties of nuclear masses and decay modes

Koura, Hiroyuki; Tachibana, Takahiro*; Chiba, Satoshi

no journal, , 

no abstracts in English

Oral presentation

Systematical calculation of $$beta$$-delayed fission and neutron emission probabilities for super-heavy and neutron-rich nuclei relevant to the r-process nucleosynthesis

Tachibana, Takahiro*; Koura, Hiroyuki; Chiba, Satoshi

no journal, , 

Effect of nuclear fission to the r-process nucleosynthesis is a quite interesting topic, that connects studies of superheavy nuclei and studies of lighter neutron-rich nuclei. So far, magnitude of this effect, however, is not so clearly understood, because such nuclear mass regions are quite far from the experimentally known nuclides and predictions by using some global models of nuclear masses have rather large ambiguity. In this study, we mainly focus on the $$beta$$-delayed fission, which has a possibility to affect abundance of the r-process. We make an improvement of calculation of $$beta$$-delayed fission probability in the super-heavy and neutron-rich region, and discuss the effect of it. We also calculate the $$beta$$-delayed neutron emission probabilities.

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