Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session 2WCA: Quenching of Spectroscopic Factors: Open Questions and Future Perspectives I |
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Chair: Heather Crawford, Lawrence Berkeley National Laboratory Room: Hilton Kohala 2 |
Tuesday, October 23, 2018 2:00PM - 2:30PM |
2WCA.00001: Reduction of spectroscopic strength from nucleon knockout reactions Invited Speaker: Alexandra Gade The nuclear shell model pictures deeply bound nucleons as being in fully occupied states. At and above the Fermi surface, configuration mixing then leads to occupancies that gradually decrease to zero. This picture is modified in an important way by several correlation effects that are absent from, or are described only approximately by, effective-interaction theories, such as the shell model. This presentation will give a summary on the status of the reduction in spectroscopic strength as reported from Be- or C-induced one-nucleon knockout reactions. |
Tuesday, October 23, 2018 2:30PM - 3:00PM |
2WCA.00002: Theoretical achievements and questions in the quenching problem Invited Speaker: Kazuki Yoshida A systematic reduction of spectroscopic factors was obtained by nucleon removal reaction analysis as in Ref.[1,2]. Triggered by those results, the quenching problem has been discussed over almost a decade. Recently, new results with different types of reaction have been reported and less systematics was found. [1] A. Gade et al., Phys. Rev. C 90, 057602 (2014). |
Tuesday, October 23, 2018 3:00PM - 3:30PM |
2WCA.00003: Spectroscopic factors of asymmetric nuclei through a quasi-free scattering lens Invited Speaker: Stefanos Paschalis The motivation for this work has been the reported reduction of single-particle strength with respect to the independent particle model and in particular the dependency of this reduction as a function of isospin asymmetry. The overall reduction is attributed to nucleons’ short- and long-range correlations that are not captured in a simple independent-particle model. Experimental results using different reaction mechanisms tend to agree on the magnitude of this reduction when neutron and proton numbers are similar but disagree for asymmetric nuclei. The experimentally obtained values for this reduction depend strongly on the reaction theory used for comparison and have triggered further debate. In this contribution, I will discuss the reduction of spectroscopic factors as a function of isospin asymmetry from an experimentalist point of view. In particular, I will present new results from quasi-free scattering reactions in inverse kinematics, obtained using the R3B/LAND setup at GSI, that probe a wide range of isospin asymmetry. Both proton and neutron knockout are discussed, ranging from neutron deficient to neutron rich regions [1, 2, 3]. The reported reductions are obtained by comparison to DWIA calculations based on eikonal theory [4]. Finally, The results are compared to other hadron induced quasi-free scattering experiments and electron scattering experiments. [1] L. Atar et al., PRL 120 (2018) 052501 [2] M. Holl et al., submitted to PLB [3] V. Panin, et al., PLB 753 (2016) 204–210 [4] T. Aumann et al., PRC 88 (2013) 064610 |
Tuesday, October 23, 2018 3:30PM - 4:00PM |
2WCA.00004: COFFEE BREAK
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