In-medium Meson properties and Nuclear Exotres.

中介子特性和核外线。

• 批准号: 14540268
• 负责人: HIRENZAKI Satoru
• 金额: $ 2.24万
• 依托单位: Nara Women's University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540268/
• 关键词: Pionic Atom; η mesic nuclears; (d,^3He)reaction; (d,^3He)反応; ハドロン物理; カイラル対称性; パイ中間子原子; η中間子

The properties of eta-nucleus interaction and their experimental consequences are investigated with eta-nucleus optical potentials obtained by postulating the N^*(1535) dominance for eta-N system. The N^*(1535) properties in nuclear medium are evaluated by two kinds of chiral effective models based on distinct pictures of N^*(1535). We find that these two models provide qualitatively different optical potentials of the eta meson, reflecting the in-medium properties of N^*(1535) in these models. In order to compare these models in physical observables, we calculate spectra of (d,3He) reactions for the eta mesic nucleus formation with various kinds of target nuclei. We show that the (d,3He) spectra obtained in these models are significantly different and are expected to be distinguishable in experiments.We also explore the possibility to observe an enhanced 2pi correlation in the scalar iso-scalar (sigma) channel in nuclei by (d,t) and (d,^3He) reactions to obtain new information on the partial restoration of chiral symmetry in the nuclear medium. The sensitivity of the reaction spectra on the change of the chiral condensate in the nuclear medium is examined.

通过假设 eta-N 系统的 N^*(1535) 优势获得的 eta 核光势，研究了 eta 核相互作用的性质及其实验结果。基于N^*(1535)的不同图像，通过两种手性有效模型评估了核介质中的N^*(1535)性质。我们发现这两个模型提供了不同性质的 eta 介子光学势，反映了这些模型中 N^*(1535) 的介质特性。为了在物理可观测值中比较这些模型，我们计算了 eta 中核与各种目标核形成的 (d,3He) 反应谱。我们表明，这些模型中获得的 (d,3He) 谱有显着差异，预计在实验中可以区分。我们还探索了通过 (d,t) 和 (d,^3He) 反应观察原子核中标量等标量 (sigma) 通道中增强的 2pi 相关性的可能性，以获得有关核介质中手性对称性部分恢复的新信息。检查了反应光谱对核介质中手性缩合物变化的敏感性。

项目成果

比連崎 悟, 他: "Formation of σ mesic nuclei in (d,t) and (d,3He) reactions"Nuclear Physics. A710. 131-144 (2002)

Satoru Hirenzaki 等人：“(d,t) 和 (d,3He) 反应中 σ 中性核的形成”核物理 A710 131-144 (2002)。

S.Hirenzaki, E.Oset: "Deeply bound pionic atoms from the (γ,p) reaction in nuclei"Physics Letters. B527. 69-72 (2002)

S.Hirenzaki，E.Oset：“原子核中 (γ,p) 反应的深度结合的介电原子”《物理快报》B527 (2002)。

H.Geissel, H.Glig, A.Gillitzer, R.S.Hayano, S.Hirenzaki, K.Itahashi, M.Iwasaki, P.Kienle, M.Mu"nch, G.Mu"zenberg, W.Schott, K.Suzuki, D.Tomono, H.Weich, T.Yamazaki, T.Yoneyama: "Deeply bound is and 2p pionic states in 205Pb and determination of the s-wave

H.Geissel、H.Glig、A.Gillitzer、R.S.Hayano、S.Hirenzaki、K.Itahashi、M.Iwasaki、P.Kienle、M.Mu"nch、G.Mu"zenberg、W.Schott、K.Suzuki

鈴木謙 他: "Precision spectroscopy of pionic 1s states of Sn nuclei and evidence for partial restoration of chiral symmetry"Physical Review Letters. 掲載予定. (2004)

Ken Suzuki 等人：“Sn 核的 π 1s 态的精密光谱和部分恢复手性对称性的证据”《物理评论快报》（2004 年）。

D.Jido, H.Nagahiro, S.Hirenzaki: "Medium effects to N(1535) resonance and η mesic nuclear"Physical Review. C66. 045202 (2002)

D.Jido、H.Nagahiro、S.Hirenzaki：“对 N(1535) 共振和 η mesic 核的中等影响”物理评论 045202 (2002)。