Strong Neutron Pairing in core+4<i>n</i> Nuclei

Revel, A, Marques, FM, Sorlin, O, Aumann, T, Caesar, C, Holl, M, Panin, V, Vandebrouck, M, Wamers, F, Alvarez-Pol, H
et al (show 90 more authors) (2018) Strong Neutron Pairing in core+4<i>n</i> Nuclei. PHYSICAL REVIEW LETTERS, 120 (15). 152504-.

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The emission of neutron pairs from the neutron-rich N=12 isotones ^{18}C and ^{20}O has been studied by high-energy nucleon knockout from ^{19}N and ^{21}O 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 ^{19}N(-1p)^{18}C^{*}→^{16}C+n+n is clearly dominated by direct pair emission. The two-neutron correlation strength, the largest ever observed, suggests the predominance of a ^{14}C 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 ^{21}O(-1n)^{20}O^{*}→^{18}O+n+n, attributed to its formation through the knockout of a deeply bound neutron that breaks the ^{16}O core and reduces the number of pairs.

Item Type: Article
Additional Information: 6 pages, 4 figures, accepted for publication in Phys. Rev. Lett
Uncontrolled Keywords: nucl-ex, nucl-ex
Depositing User: Symplectic Admin
Date Deposited: 23 Jan 2020 11:39
Last Modified: 18 Oct 2023 17:01
DOI: 10.1103/PhysRevLett.120.152504
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