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Short-range correlations in nuclei with similarity renormalization group transformations
| Title: | Short-range correlations in nuclei with similarity renormalization group transformations |
| Authors: | Neff, T. Browse this author | | Feldmeier, H. Browse this author | | Horiuchi, W. Browse this author |
| Issue Date: | 18-Aug-2015 |
| Publisher: | American Physical Society |
| Journal Title: | Physical review c |
| Volume: | 92 |
| Issue: | 2 |
| Start Page: | 024003 |
| Publisher DOI: | 10.1103/PhysRevC.92.024003 |
| Abstract: | 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 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/59964 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 堀内 渉
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