Unbound neutron ν0d3/2 strength in 17C and the N=16 shell gap

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LOIS-FUENTES, Juan, FERNANDEZ-DOMINGUEZ, Beatriz, DELAUNAY, F, PEREIRA-LÓPEZ, X, ORR, N, PŁOSZAJCZAK, M, MICHEL, N, OTSUKA, T, SUZUKI, T, CATFORD, W, SORLIN, O, ACHOURI, N, ASSIÉ, M, BAILEY, S, BASTIN, B, BLUMENFELD, Y, BORCEA, R, CAAMAÑO, M, CACERES, L, CLÉMENT, E, CORSI, N, CURTIS, N, DESHAYES, Q, FARGET, F, FISICHELLA, M, DE FRANCE, G, FRANCHOO, S, FREER, M, GIBELIN, J, GILLIBERT, A, GRINYER, G, HAMMACHE, F, KAMALOU, O, KNAPTON, A, KOKALOVA, T, LAPOUX, V, LAY, J, LE CROM, B, LEBLOND, S, MARQUÉS, F, MATTA, A, MORFOUACE, P, MORO, A, PANCIN, J, PERROT, L, PIOT, J, POLLACCO, E, PUNTA, P, RAMOS, D, RODRÍGUEZ-TAJES, C, ROGER, T, ROTARU, F, SÉNOVILLE, M, DE SÉRÉVILLE, N, SMITH, Robin, STANOIU, M, STEFAN, I, STODEL, C, SUZUKI, D, THOMAS, J, TIMOFEYUK, N, VANDEBROUCK, M, WALSHE, J and WHELDON, C (2025). Unbound neutron ν0d3/2 strength in 17C and the N=16 shell gap. Physics Letters B, 867: 139600. [Article]

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35716:964297

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Abstract

Significant continuum strength has been observed to be populated in 17C produced in the d(16C,p) reaction at a beam energy of 17.2 MeV/nucleon. The strength appears at greater than ∼2 MeV above the single-neutron decay threshold and has been identified as arising from transfer into the neutron 0d3/2 orbital. Guided by shell model predictions the greater majority of the strength is associated with a 3/2+ state at an excitation energy of 4.40 MeV and a much weaker 3/2+ level at 5.60 MeV. The corresponding total widths were determined to be 3.45 and 1.6 MeV, respectively. From the backward angle proton differential cross sections and the branching ratios for neutron decay to the 16C(2 ) level, the corresponding spectroscopic factors to the ground state were deduced to be 0.47±10 and <0.09. Shell-model calculations employing the phenomenological SFO-tls interaction as well as Gamow Shell-Model calculations including continuum effects are in reasonable agreement with experiment, although the predicted strength lies at somewhat lower energy. The size of the N=16 shell gap ( ) was estimated to be 5.08 MeV - some 1.3 MeV larger than found in the SFO-tls shell model calculation.

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Official URL:

https://www.sciencedirect.com/science/article/pii/...

Uncontrolled Keywords:

0105 Mathematical Physics; 0201 Astronomical and Space Sciences; 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; Nuclear & Particles Physics; 49 Mathematical sciences; 51 Physical sciences

Identifiers

Identification Number:

10.1016/j.physletb.2025.139600

ORCID for Robin Smith: