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

Significant continuum strength has been observed to be populated in 17 C produced in the d( 16 C,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 0 d 3 / 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 − 0.14 + 0.33 MeV and a much weaker 3/2 + level at 5.60 − 0.45 + 1.35 MeV. The corresponding total widths were determined to be 3.45 − 0.78 + 1.82 and 1.6 − 1.4 + 4.6 MeV, respectively. From the backward angle proton differential cross sections and the branching ratios for neutron decay to the 16 C(2 1 + ) 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 ( ε ν 0 d 3 / 2 − ε ν 1 s 1 / 2 ) was estimated to be 5.08 − 0.33 + 0.43 MeV - some 1.3 MeV larger than found in the SFO-tls shell model calculation.

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Publication Details

Journal
Physics Letters B
Published
2025-05-23
DOI
https://doi.org/10.1016/j.physletb.2025.139600
Primary Topic
Nuclear physics research studies
Type
article
Field-Weighted Citation Impact
0.00

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article

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

A. Corsi, N. Timofeyuk, V. Lapoux, J. C. Thomas et al.
Physics Letters B
Nuclear physics research studies
article

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

A. Corsi, N. Timofeyuk, V. Lapoux, J. C. Thomas, J. Walshe, N. Michel, Daisuke Suzuki, J. A. Lay, C. Rodríguez–Tajes, A. Matta, P. Morfouace, N. Curtis, B. Le Crom, J. Gibelin, Y. Blumenfeld, M. Fisichella, M. Assié, N. de Séréville, T. Suzuki, A. M. Moro, F. Farget, A. Gillibert, M. Vandebrouck, B. Fernández–Domínguez, Sylvain Leblond, Q. Deshayes, J. Piot, T. Roger, G. de France, M. Stănoiu, B. Bastin, F. Rotaru, X. Pereira-López, F. Delaunay, M. Caamaño, I. Stefan, L. Cáceres, O. Kamalou, S. Bailey, F. Hammache, R. Borcea, W. N. Catford, J. Lois-Fuentes, G. F. Grinyer, C. Stödel, E. Clément, Takaharu Otsuka, D. Ramos, M. Sénoville, Carl Wheldon, R. Smith, N. A. Orr, M. Płoszajczak, A. Knapton, M. Freer, P. Punta, Tz. Kokalova, S. Franchoo, O. Sorlin, N. L. Achouri, F.M. Marqués, J. Pancin, E. Pollacco, L. Perrot
article en

Abstract

Significant continuum strength has been observed to be populated in 17 C produced in the d( 16 C,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 0 d 3 / 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 − 0.14 + 0.33 MeV and a much weaker 3/2 + level at 5.60 − 0.45 + 1.35 MeV. The corresponding total widths were determined to be 3.45 − 0.78 + 1.82 and 1.6 − 1.4 + 4.6 MeV, respectively. From the backward angle proton differential cross sections and the branching ratios for neutron decay to the 16 C(2 1 + ) 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 ( ε ν 0 d 3 / 2 − ε ν 1 s 1 / 2 ) was estimated to be 5.08 − 0.33 + 0.43 MeV - some 1.3 MeV larger than found in the SFO-tls shell model calculation.

Physics Letters BVol. 867
Nihon University (JP), Centre National de la Recherche Scientifique (FR), Universidade de Santiago de Compostela (ES), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris-Saclay (FR), Japan Proton Accelerator Research Complex (JP), University of Surrey (GB), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), Institute for Basic Science (KR), Laboratoire de Physique Corpusculaire de Caen (FR), Institut National de Physique Nucléaire et de Physique des Particules (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Laboratoire National Henri Becquerel (FR), Grand Accélérateur National d'Ions Lourds (FR), The University of Tokyo (JP), University of Birmingham (GB), Université de Caen Normandie (FR)
Institutul National de Cercetare-Dezvoltare pentru Fizica si Inginerie Nucleara 'Horia Hulubei', Centre National de la Recherche Scientifique, Xunta de Galicia, Science and Technology Facilities Council, Agencia Estatal de Investigación, Institut National de Physique Nucléaire et de Physique des Particules
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Nuclear physics research studies
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