セミナー(2015.12.18):Das Pemmaraju氏 (LBNL)

Dec.18, 2015, 13:45 at D312 (自然学系D棟)

Speaker: Das Pemmaraju (The Molecular Foundry and Chemical Sciences

Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA)

Title: First-principles interpretation of attosecond time-resolved XUV absorption spectroscopy of laser excited Silicon

Abstract: The availability of ultrafast x-ray pulses both from powerfulfree electron laser light-sources as well as table top high-harmonicgeneration, has significantly enhanced the utility of core-levelspectroscopies as probes for investigating dynamical processes infunctional materials. Theoretical approaches to complement these time-domain experiments are therefore actively being developed. In this context, I will discuss recent efforts that employ a combination of real-time time-dependent density functional theory (TDDFT), occupancy-constrained density functional theory and many-body perturbation theory approaches to help interpret spectral signatures in attosecond time-resolved core-level spectroscopic measurements on laser-excited silicon. Out-of-equilibrium electron-hole densities obtained from real-time TDDFT simulations of the valence electron dynamics are used to estimate the transient modulation of L-edge absorption in femtosecond infrared pump – attosecond XUV probe experiments. Furthermore, the contribution of electron-phonon and electron-electron scattering mechanisms to the lifetime broadening observed in measured L-edge spectra is estimated using occupation-constrained density functional theory and GW calculations respectively.

ポスドク研究員公募(締切:2016年1月22日)

筑波大学計算科学研究センター研究員公募

1. 募集人員:研究員 1名
2. 専門分野: 原子核物理学(理論)
3. 勤務地・所属:
   茨城県つくば市天王台1-1-1
   筑波大学計算科学研究センター原子核物理研究部門
4. 職務内容:
   計算核物理学に関する研究。特に、部門メンバーと協力しながら、筑波大計算科学研究センターと東大情報基盤センターが共同運営する最先端共同HPC基盤施設(JCAHPC)における次期スーパーコンピュータシステムにおけるアプリ開発に従事して頂ける方が望ましい。
5. (1) 着任時期:平成28年4月1日以降のできるだけ早い時期
    (2) 任期:着任後3年
    (3) 年俸制(本学規定による)(年俸額は, 経歴等を考慮し決定)
6. 応募資格:
 博士の学位を有する方又は平成28年3月に博士の学位取得見込みの方。
7. 提出書類:
 (1)履歴書(写真貼付)
 (2)業績リスト(論文は査読付きとその他を区別)
 (3)主な論文別刷(3編以内)
 (4)これまでの研究の概要
 (5)研究計画と今後の抱負
 (6)本人についての意見を求め得る方2名の氏名及び連絡先
8. 応募締切: 平成28年1月22日(金) 必着
9. (1) 提出先
        〒305-8577 つくば市天王台 1-1-1
  筑波大学計算科学研究センター
  中務 孝
   (2) 問い合わせ先
  筑波大学計算科学研究センター 原子核物理研究部門主任
  中務 孝(TEL: 029-853-4282, e-mail: apply [at] nucl.ph.tsukuba.ac.jp)
10. 応募上の注意:
   封筒に「センター研究員(原子核物理学)応募書類在中」と朱書きし、簡易書留か宅配便にてお送りください。
11. その他
    筑波大学では男女雇用機会均等法を遵守した人事選考を行っています。

Theoretical Nuclear Physics Division in Center for Computational Sciences, University of Tsukuba anticipates an opening for a postdoctoral researcher in nuclear theory beginning in April of 2016. Current research efforts by Profs. Nakatsukasa, Yabana, Hashimoto, and Hinohara include works on applications of density functional theory, theories of large amplitude collective motion, and cluster/few-body models, to problems of nuclear structure and reaction. Applicants abroad should send the application materials, both by postal mail and by email with attached PDF files.

1. Position Title: Postdoctoral Researcher
2. Subject Area: Theoretical Nuclear Physics
3. Position Location: Center for Computational Sciences, University of Tsukuba, Tsukuba 305-8577, Japan
4. Job description: Research in computational nuclear physics
5. (1) Start of employment: April 1, 2016 or later (negotiable)
    (2) Period of employment: Three years
    (3) Conditions: Full-time employment. Salary will be commensurate with qualifications and experience.
6. Qualifications: Candidates must hold a doctoral degree in a related field, or receive it before start of employment
7. Application Materials Required:
 (1) Curriculum Vitae
 (2) Publication List
 (3) Copy of three major publications
 (4) Research statement
 (5) Research plan
 (6) Names and contact information of two reference persons
8. Application Deadline: Jan. 22, 2016
9. (1) Application materials should be sent to
          Prof. T. Nakatsukasa
          Center for Computational Sciences, University of Tsukuba
          1-1-1 Tennodai, Tsukuba 305-8577, Japan
    NB: Please write in red ink “CCS Postdoctoral Research Fellow (Nuclear Physics)” on the front side of envelope.
   (2) Contact
       Takashi Nakatsukasa
       Division chief of Theoretical Nuclear Physics
       TEL: +81 29-853-4282
       Email: apply [at] nucl.ph.tsukuba.ac.jp
10. Note: The University of Tsukuba is an equal opportunity employer.

第10回日本物理学会若手奨励賞(関澤さん)

本研究室出身(現ワルシャワ工科大)の関澤一之氏が、第10回日本物理学会若手奨励賞を受賞することが決まりました。

 

セミナー(2015.10.16):George F Bertsch氏 (INT)

2015年10月16日(金)13:00より、ワシントン大学 Institute for Nuclear Theory のGeorge Bertsch氏によるセミナーを予定しています。

Lecturer: Prof George F Bertsch (INT, Univ. of Washington)
Title: A new approach to fission theory
Place: D312
Date/Time: October 16, 2015 / 13:00

集中講義 (2015.12.28-29):飯田圭氏(高知大)

2日間の集中講義を以下の日程で行います。

題目:「中性子星の物理」

講師:飯田 圭氏(高知大学 教授)

日程:

12月 28日(月)10:30~12:00, 14:00~15:30, 16:00~17:30

12月 29日(火)10:30~12:00, 14:00~15:30, 16:00~17:30

場 所:筑波大学自然学系棟D312

内容:中性子星は超新星爆発のあとに残るコンパクトな天体の一形態である。中性子星で見られる多彩な現象から、地上では作り得ない高密度物質の性質をさぐる。講義内容は主に、以下の通り。

1.中性子星の魅力とパルサーの魔力

2.中性子星物質の多彩な物性

3.中性子星の進化と高密度物質

4.パルサーグリッチ現象と中性子渦糸のピン止め

5.中性子星クラストとパスタ原子核

講義資料(制限あり)PPT1, PPT2, PPT3, PPT4, PPT5

セミナー(2015.9.15):渡辺元太郎氏 (IBS)

9月13-15日の日程で、Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS)[韓国]から渡辺元太郎氏の訪問があり、筑波大の当研究室に滞在します。また、以下のセミナーを開催する予定です。

Date: September 15th (Tue) 11:00-
Place: Meeting Room A, Center for Computational Sciences (1F)
Lecturer: Dr Gentaro Watanabe (IBS, Korea)
Title: Quantum fluctuation theorems and generalized measurements: towards their verification using cold atomic gases
Abstract: We discuss transient fluctuation theorems in quantum systems, i.e., quantum Jarzynski equality and Tasaki-Crooks relation. In these quantum fluctuation theorems, work is defined by the projective energy measurements at the beginning and the end of the force protocol. However, projective measurements are difficult to implement experimentally. This is a major obstacle to the direct verification of the transient fluctuation theorems in quantum systems. It is thus important to ask whether these projective measurements can be replaced with generalized measurements which could be easier to implement [1-3]. First, we prove a kind of no-go theorem that only projective measurements can satisfy the Crooks relation for an arbitrary force protocol [1]. Then we show that, however, we can overcome this no-go theorem [3]. We will also discuss the future prospects towards the verification of the quantum fluctuation theorems using cold atomic gases.
[1] B. P. Venkatesh, G. Watanabe, and P. Talkner, New J. Phys. 16, 015032(2014).
[2] G. Watanabe, B. P. Venkatesh, P. Talkner, M. Campisi, and P. Haenggi, Phys. Rev. E 89, 032114 (2014).
[3] G. Watanabe, B. P. Venkatesh, and P. Talkner, Phys. Rev. E 89, 052116 (2014).
* The seminar is given in English.

不安定核セミナー開催(2015.9.2)

以下の内容で、第34回つくば不安定核セミナーを開催致します。また、セミナーに先立ち、13:30-15:45まで、同じ会場において講義を行います。また、すべて日本語での講演(スライドは英語)で行います(PDF)。

題目:RIBFにおける不安定核の崩壊測定と重元素合成 (Study of decay properties and synthesis of heavy elements at RIBF)

講師: 西村 俊二

所属: 理化学研究所・仁科加速器研究センター、先任研究員 日時: 2015年9月2 日( 水 )16:00より

場所: 筑波大学、総合研究棟B、1階110講義室

概要:

A new generation radioactive isotope facility (RIBF) has started providing highest intensity neutron-rich nuclei using in-flight fission of a 345 MeV/nucleon 238U beam. Bringing together with high detection efficiency gamma-ray detectors (Euroball HPGe) and newly developed beta-counting system (WAS3ABi), harvest of decay properties for several hundreds of exotic nuclei has been conducted using the EURICA spectrometer [1-5].
My talk will describes the basis and recent progress made in beta-gamma spectroscopy and related topics of the rapid-neutron capture process (r process), sequence of neutron-capture and beta-decay processes. Future projects related to nuclear structure and nuclear astrophysics will be presented to discuss our perspective at RIBF.
[1] S. Nishimura, Prog. Theor. Exp. Phys. 2012, 03C006 (2012).
[2] H. Watanabe et al., Phys. Rev. Lett. 111, 152501 (2013).
[3] Z.Y. Xu et al., Phys. Rev. Lett. 113, 032505 (2014).
[4] G.S. Simpson et al., Phys. Rev. Lett. 113, 132502 (2014).
[5] G. Lorusso et al., Phys. Rev. Lett. 114, 192501 (2015).

セミナー(2015.7.1):Dr Anatoli Afanasjev (Mississippi State University)

学振招へい(短期)で滞在されるミシシッピ州立大学の Anatoli Afanasjev氏のセミナーを7月1日午前10:30より自然学系D棟312号室で開催します。

Lecturer: Prof. Anatoli Afanasjev (Mississippi State University)
Title: Addressing theoretical uncertainties in nuclear DFT
Abstract:
Even with new generation of experimental facilities such as RIKEN, FRIB and SU- PERHEAVY FACTORY, almost half of the Z ≤ 120 nuclei will be beyond of experimental reach. However, the modeling of nuclear astrophysical processes requires precise nuclear information on masses, β-decay rates, fission properties etc. In such a situation it is im- portant to understand theoretical uncertainties on global scale and their sources. This will also allow to improve nuclear structure models and to define better fitting protocols. In my talk these questions will be addressed within the framework of covariant density functional theory.
I will start from the global assessment of the description of ground state observables of even-even nuclei in the CDFT framework. Calculated binding energies, the deformations, radii, neutron skins, two-neutron separation energies and the positions of the proton-drip line will be compared in a systematic way with available experimental data. The estimates of theoretical uncertainties in these observables with increasing isospin and their evolution up to two-neutron drip line will be provided. Then I will focus on two-neutron drip line and superheavy nuclei and the sources of theoretical uncertainties in their description.
It is clear that the current generation of energy density functionals has some important limitations. The possibilities of their extension and thus the improvement of the descrip- tion of experimental data and the decrease of theoretical uncertainties will be discussed.

不安定核セミナー開催(2015.6.10)

6月10日に不安定核セミナー&講義を筑波大学において開催します。

詳細はこのページをご覧ください。

セミナー(2015.6.8):Dr Panagiota PAPAKONSTANTINOU (IBS, RISP)

韓国のiBSからPapakonstantinou氏が来られて以下のセミナーを行います。場所は自B214です。

Date/Time: June 8 (Mon), 13:45 pm-
Place: B214 (Institute of Natural Sciences, Univ. of Tsukuba)
Lecturer:  Panagiota PAPAKONSTANTINOU (Institute for Basic Science, Rare Isotope Science Project)
Title: Beyond the mean-field picture, with realistic nuclear interactions
Abstract:
In the past decades, energy-density functional methods have advanced greatly the field of nuclear structure. They have allowed a microscopic and unified description of many properties in medium-mass and heavy nuclei, from masses and sizes to giant resonances, as well as nuclear matter. Known issues include the poorly constrained time-odd terms and the concept of non-linear density dependencies. Fitting the free parameters on the mean-field level means, moreover, that double counting of unknown effects is inevitable in beyond-mean-field applications. In this talk I will present an effort to describe nuclear properties, starting from microscopic NN(N) Hamiltonians, which allows for systematic and controlled extensions of mean-field theory, and can thus be applied in heavy nuclei. The Hamiltonians are first softened via unitary transformations. They can describe nuclear ground states within perturbation theory. They are then applied in linear response theory, namely the random phase approximation and its extensions, to study giant resonances and other vibrational modes. This line of work bridges strictly ab initio methods, restricted to very low energies and light nuclei, and more phenomenological, traditional approaches. It exploits nsights from both and could help them advance in tandem.