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Short-range correlations in nuclei with similarity renormalization group transformations

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タイトル: Short-range correlations in nuclei with similarity renormalization group transformations
著者: Neff, T. 著作を一覧する
Feldmeier, H. 著作を一覧する
Horiuchi, W. 著作を一覧する
発行日: 2015年 8月18日
出版者: American Physical Society
誌名: Physical review c
巻: 92
号: 2
開始ページ: 024003
出版社 DOI: 10.1103/PhysRevC.92.024003
抄録: Background: Realistic nucleon-nucleon interactions induce short-range correlations in nuclei. To solve the many-body problem unitary transformations like the similarity renormalization group (SRG) are often used to soften the interactions. Purpose: Two-body densities can be used to illustrate how the SRG eliminates short-range correlations in the wave function. The short-range information can however be recovered by transforming the density operators. Method: The many-body problem is solved for He-4 in the no core shell model (NCSM) with SRG transformed AV8' and chiral N3LO interactions. The NCSM wave functions are used to calculate two-body densities with bare and SRG transformed density operators in two-body approximation. Results: The two-body momentum distributions for AV8' and N3LO have similar high-momentum components up to relative momenta of about 2.5 fm(-1), dominated by tensor correlations, but differ in their behavior at higher relative momenta. The contributions of many-body correlations are small for pairs with vanishing pair momentum but not negligible for the momentum distributions integrated over all pair momenta. Many-body correlations are induced by the strong tensor force and lead to a reshuffling of pairs between different spin-isospin channels. Conclusions: When using the SRG it is essential to use transformed operators for observables sensitive to short-range physics. Back-to-back pairs with vanishing pair momentum are the best tool to study short-range correlations.
Rights: ©2015 American Physical Society
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 堀内 渉


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