佐藤さん第１９回凝縮系科学賞授賞 Sato san got the 19th Condensed-Matter Science Prize

2024年11月28日 | 新着情報

佐藤さんが第１９回凝縮系科学賞(理論部門)を受賞しました。

Dr. Sato has received the 19th Condensed-Matter Science Prize.

 

ハイライト論文に選定 A paper selected as Editors’ Suggestion

2024年11月15日 | 新着情報

A paper by N. Hinohara and collaborators has been published in Physical Review C of American Physical Society, and selected as an Editors’ Suggestion. The paper analyzes the charge radii by decomposing the contributions into orbital occupations and radial wave functions.

荷電半径を軌道ごとの寄与と動径波動関数に分解して分析した論文（著者：日野原・その他）が、アメリカ物理学会のPhysical Review Cから出版され、Editors’ Suggestionに選ばれました。

 

 

Seminar (セミナー)2024.11.22 Nakada, Hitoshi (Chiba University)

2024年10月29日 | 新着情報

The following seminar will be given by Dr Nakada, Hitoshi in Chiba University on Friday, November 22nd, 2024.

Lecturer: Hitoshi Nakada (Chiba University)
Place: Workshop Room, Center for Computational Sciences
Date/Time:: November 22, Friday, 15:40 pm –
Title:: Deformability of neutron-deficient Sn nuclei and related topics studied with semi-realistic interaction
Abstract:: As experimental data in unstable nuclei have been accumulated, it has been recognized that magic numbers are more fragile than believed previously. Whereas the Sn nuclei have been considered typical spherical nuclei, the E2 transitions in neutron-deficient Sn nuclei are hard to describe within the conventional picture. The deformability of the neutron-deficient Sn nuclei will be argued, based on self-consistent calculations with a semi-realistic interaction, The relevance of the pseudo-spin symmetry and the roles of the tensor force in it will also be argued.

Rising Researchers Seminar 2024.11.12 Kumar, Anil (University of Tsukuba)

2024年10月25日 | 新着情報

Dr Anil Kumar will give the following talk at Rising Researchers Seminar online on November 12, 2024. Contact INT, University of Washington (intmail@uw.edu) for the zoom link.

Title: Large-scale shell model study of β- -decay properties of N = 126, 125 nuclei along the r-process path

Abstract: The rapid neutron capture process (r-process) is the most important mechanism for the synthesis of about half of the elements heavier than iron. It occurs in an environment with relatively high temperatures and high neutron densities. The abundances of the elements created by the r-process strongly depend on several nuclear inputs like masses, neutron capture rates, β-decay rates, and β-delayed neutron emission probabilities at the waiting point nuclei. Among them, the β-decay process plays a crucial role in the r-process. We have investigated various nuclear β-decay properties of N = 126,125 isotones with proton numbers Z = 52 − 79 within the framework of the nuclear shell model. This comprehensive analysis considered both Gamow-Teller (GT) and first-forbidden (FF) transitions to evaluate β-decay rates. We have found that including FF transitions in addition to GT transitions is essential, as they significantly impact the total β-decay half-lives near Z = 82. Additionally, we systematically analyzed the GT strength distributions as a function of proton number. We have observed that the GT strengths at low excitation energies are rather strong on the proton deficient side due to the increasing number of proton holes in the proton 0h_{11/2} orbit, which accelerates GT decay. This investigation aims to provide detailed information on β-decay properties around A ≈ 195 to understand the distribution of the third r-process abundance peak.

Ruike san received Student Presentation Award of the JPS: 類家さんが日本物理学会学生優秀発表賞受賞を受賞

2024年10月24日 | 新着情報

Ms. Ruike has received the Student Presentation Award of the Physical Society of Japan (79th Annual meeting in 2024).

類家さんが2024年9月に開催された日本物理学会第79回年次大会での発表で日本物理学会学生優秀発表賞を受賞しました。

 

From the Atomic Nucleus to the Cosmos (Anil Kumar)

2024年10月23日 | 新着情報

An introduction article of Anil Kumar is published in JICFus website.

Anil Kumarさんの紹介記事が計算基礎科学連携拠点(JICFus)のページに掲載されました。

From the Atomic Nucleus to the CosmosPost-doctoral researcher from India is using the supercomputer Fugaku to help decode the universe

 

 

 

 

 

Seminar (セミナー)2024.10.24 Pierre Arthuis (IJC lab)

2024年10月18日 | 新着情報

The following two seminars will be held on October 24, 2024, at Meeting Room B in Center for Computational Sciences, University of Tsukuba, starting from 16:00 pm.

Speaker: Michal Repisky
Affiliation: Laboratoire des Deux Infinis Irène Joliot-Curie, CNRS, France
Title: Neutron-rich nuclei and neutron skins from chiral low-resolution interactions
Abstract: The quest for an ab initio description of atomic nuclei has benefited recently from a lot of progress in the development of chiral interactions, allowing for predictions to span the nuclear chart up to 208Pb. Still, an accurate description of all nuclear structure properties on the basis of one single interaction remains out of reach to this day. In this talk, we will introduce two low-resolution chiral interactions recently developed for the description of bulk properties of nuclei [1], from ground-state energies to density distributions. In particular, we will discuss how they shade a new light on the neutron skin, that connects finite nuclei to neutron stars and the description of infinite matter.

[1] P. Arthuis, K. Hebeler and A. Schwenk, arXiv:2401.06675 (2024)

プレスリリース, Press release

2024年7月8日 | 新着情報

Dr Miyagi and Collaborators have made a press release from the Technical University of Darmstadt, Germany, on solving the problem on the nuclear magnetic moment. Details can be found in this page.

宮城さんと共同研究者等が、原子核の磁気モーメントの計算に成功し、ドイツ・ダルムシュタット工科大学からプレスリリースを行いました。詳細はこちら。

Seminar (セミナー)2024.6.28 Michal Repisky & Lukas Konecny (The Arctic University of Norway)

2024年6月24日 | 新着情報

The following two seminars will be held on June 28, 2024, at Meeting Room A in Center for Computational Sciences, University of Tsukuba, starting from 15:15 pm.

  • Speaker: Michal Repisky
    Affiliation: Comenius University in Bratislava, Slovakia & UiT The Arctic University of Norway, Tromsø, Norway
    Title: Relativistic Hamiltonians and DFT
    Abstract: Despite the success of non-relativistic quantum mechanics in describing molecular and material properties, there are many phenomena for whose correct description the special theory of relativity has to be considered. These phenomena are dubbed relativistic effects and are prominent when the systems of interest involve heavy elements or spin. In my presentation I will show how the Dirac equation is solved in quantum chemistry while introducing the four-component Dirac-Coulomb Hamiltonian and relativistic DFT methodology. Moreover, I will present modern two-component X2C Hamiltonian based on algebraic decoupling of the original Dirac Hamiltonian and show that it allows to reproduce reference four-component results at a fraction of their cost allowing us to abandon the still widespread notion of the infeasibility of fully relativistic approaches.
  • Speaker: Lukas Konecny
    Affiliation: UiT The Arctic University of Norway, Tromsø, Norway & Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
    Title: Relativistic spectroscopy in frequency and time domains
    Abstract: I will present the extension of relativistic electronic structure methods into the realm of dynamical molecular properties in the form of relativistic time-dependent density functional theory (TDDFT). I will present two approaches to relativistic TDDFT as implemented in our computer program ReSpect. First is the conventional linear response TDDFT and its applications for electron absorption and circular dichroism spectroscopies with focus on the core region where both scalar and spin-orbit relativistic effects are especially pronounced. Next is the real-time solution of the Dirac-Kohn-Sham equation that offers access to non-linear optical properties as well as modern attosecond spectroscopies.