第39回つくば不安定核セミナー

分類物理セミナー
開始2017/07/26(水)16:00
終了2017/07/26(水)17:30
会場筑波大学 総合研究B棟1階 B112講義室
講演タイトル希土類中性子過剰核の崩壊特性と低エネルギー励起準位構造 Decay properties and low-energy excitations in neutron-rich rare-earth nuclei
講演者渡邉 寛 氏(北京航空航天大学)
言語日本語/Japanese
連絡先宮武 宇也/hiroari.miyatake@kek.jp
ウェブサイト
食堂・売店利用予定なし/0

概要

 Rare-earth (RE) isotopes in the vicinity of the double mid-shell at Z = 66 and N = 104 are exemplary cases of well-deformed nuclei in which the energy levels are characterized by collective rotations and surface vibrations, as well as by quasi-particle excitations. The presence of these excitation modes within a narrow range of energy causes interplay among them to a greater or lesser extent, giving rise to a rich variety of structural aspects in deformed nuclei. Besides their importance for nuclear structure study, the decay and deformation properties of neutron-rich RE isotopes are suggested to play a crucial role in the formation of the so-called RE-element peak around A = 165 in the r-process solar abundance distribution.
 Despite such a broad range of interest, spectroscopic information still remains scarce due to the experimental difficulties in producing neutron-rich nuclei around and beyond the double mid-shell. The advent of the third-generation in-flight fragment separator facility, the RI-Beam Factory (RIBF) at RIKEN, enables access to this exotic area and allows for systematic studies of their decay properties [1]. In this seminar, I will present the results of β-decay half-lives [2] and β-γ/isomeric-decay spectroscopy [3] of neutron-rich RE isotopes obtained as part of the EURICA (EUROBALL-RIKEN Cluster Array) project at RIBF, along with a discussion about their impact on nuclear structure and nuclear astrophysics.

[1] T. Nakamura, H. Sakurai, and H. Watanabe, Prog. Part. Nucl. Phys. (in press).
[2] J. Wu et al., Phys. Rev. Lett. 118, 072701 (2017).
[3] H. Watanabe et al., Phys. Lett. B 760, 641 (2016).

* The presentation file is written in English, but the talk will be given in Japanese.

* セミナーに先立って、崩壊核分光法による核構造研究についての講義を行います。
 7月26日、13:00 - 14:00, 14:30-15:30。場所はセミナー会場です。対象は学部・修士以上。

* 会場は次のURLでご確認ください。http://www.tsukuba.ac.jp/access/map_central.html

* 車でのご来場の場合は、入構手続き、駐車場など次のURLをご参照ください。 http://www.t-anzen.org/

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