@article{ae5eb0dfe6bf4e808249996d5cad4375,
title = "Probing the Z = 6 spin-orbit shell gap with (p,2p) quasi-free scattering reactions",
abstract = "The evolution of the traditional nuclear magic numbers away from the valley of stability is an active field of research. Experimental efforts focus on providing key spectroscopic information that will shed light into the structure of exotic nuclei and understanding the driving mechanism behind the shell evolution. In this work, we investigate the Z=6 spin-orbit shell gap towards the neutron dripline. To do so, we employed NA(p,2p)CA−1 quasi-free scattering reactions to measure the proton component of the 21+ state of 16,18,20C. The experimental findings support the notion of a moderate reduction of the proton 1p1/2−1p3/2 spin-orbit splitting, at variance to recent claims for a prevalent Z=6 magic number towards the neutron dripline.",
keywords = "Exotic nuclei, Magic numbers, Quasi-free scattering reactions, Shell evolution, Spin-orbit splitting, Tensor force",
author = "{RB Collaboration} and I. Syndikus and M. Petri and Macchiavelli, {A. O.} and S. Paschalis and Bertulani, {C. A.} and T. Aumann and L. Atar and N. Kalantar-Nayestanaki and C. Rigollet",
note = "Funding Information: This work was supported by the Royal Society award UF150476 , UK STFC awards ST/M006433/1 and ST/P003885/1 , U.S. Department of Energy, Office of Nuclear Physics , contract No. DE-AC02-05CH11231 (LBNL), the German Federal Ministry of Education and Research (BMBF projects 05P15RDFN1 , 05P15WOFNA and 05P19RDFN1 ), the GSI-TU Darmstadt cooperation agreement , the State of Hesse through the LOEWE center HIC for FAIR , the Helmholtz-Gemeinschaft through the graduate school HGS-HIRe and Young Investigators Grants , and the Swedish Research Council under contract number 621-2011-5324 . This work was also supported by the Spanish research grants ( Ministerio Ciencia e Innovaci{\'o}n ), FPA2015-64969-P , FPA2015-69640-C2-1-P , FPA2017-87568-P , PGC2018-099746-B-C21 , RTI2018-098868-B-I00 , Undidad de Excelencia Mar{\'i}a de Maeztu under project MDM-2016.0692 , and the Xunta de Galicia research grant GRC ED431C 2017/54 . This work was partly supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 279384907 - SFB 1245. C.A.B. acknowledges support from the U.S. NSF Grant No. 1415656 , and U.S. DOE Grant No. DE-FG02-08ER41533 . A.O.M. would like to thank Piet Van Isacker for illuminating discussions regarding the mixing matrix elements. Publisher Copyright: {\textcopyright} 2020 The Authors",
year = "2020",
month = oct,
day = "10",
doi = "10.1016/j.physletb.2020.135748",
language = "English",
volume = "809",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "ELSEVIER SCIENCE BV",
}