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Strong neutron pairing in core+4n nuclei Fraile Prieto, Luis Mario otros, ... 539.1 Interferometry Decays State Física nuclear 2207 Física Atómica y Nuclear © 2018 American Physical Society. A. Chbihi, S. Gal´es, J.-P. Ebran, and L. Sobotka are greatly acknowledged for fruitful discussions. This work was supported by the German Federal Ministry for Education and Research (BMBF Project No. 05P15RDFN1), and through the GSI-TU Darmstadt cooperation agreement. C. A. Bertulani acknowledges support by U.S. Department of Energy Grant No. DE-FG02-08ER41533 and U.S. National Science Foundation Grant No. 1415656. Artículo firmado por más de diez autores. The emission of neutron pairs from the neutron-rich N = 12 isotones ¹⁸C and ²⁰O has been studied by high-energy nucleon knockout from ¹⁹N and ²¹O secondary beams, populating unbound states of the two isotones up to 15 MeV above their two-neutron emission thresholds. The analysis of triple fragment-n-n correlations shows that the decay ¹⁹N (-1p)¹⁸C* → ¹⁶C + n + n is clearly dominated by direct pair emission. The two- neutron correlation strength, the largest ever observed, suggests the predominance of a ¹⁴C core surrounded by four valence neutrons arranged in strongly correlated pairs. On the other hand, a significant competition of a sequential branch is found in the decay ²¹O(-1n)²⁰O*→ ¹⁸O + n + n, attributed to its formation through the knockout of a deeply bound neutron that breaks the ¹⁶O core and reduces the number of pairs. German Federal Ministry for Education and Research (BMBF) GSI-TU Darmstadt cooperation agreement U.S. Department of Energy U.S. National Science Foundation Depto. de Estructura de la Materia, Física Térmica y Electrónica Fac. de Ciencias Físicas TRUE pub 2023-06-17T12:27:55Z 2023-06-17T12:27:55Z 2018-04-12 journal article https://hdl.handle.net/20.500.14352/12153 0031-9007 10.1103/PhysRevLett.120.152504 eng 05P15RDFN1 DE-FG02-08ER41533 1415656 open access application/pdf American Physical Society