Low-lying single-particle structure of 17C and the N = 14 sub-shell closure

X. Pereira-lópez; B. Fernández-domínguez; F. Delaunay; N.l. Achouri; N.a. Orr; W.n. Catford; M. Assié; S. Bailey; B. Bastin; Y. Blumenfeld; R. Borcea; M. Caamaño; L. Caceres; E. Clément; A. Corsi; N. Curtis; Q. Deshayes; F. Farget; M. Fisichella; G. De France; S. Franchoo; M. Freer; J. Gibelin; A. Gillibert; G.f. Grinyer; F. Hammache; O. Kamalou; A. Knapton; T. Kokalova; V. Lapoux; J.a. Lay; B. Le Crom; S. Leblond; J. Lois-fuentes; F.m. Marqués; A. Matta; P. Morfouace; A.m. Moro; T. Otsuka; J. Pancin; L. Perrot; J. Piot; E. Pollacco; D. Ramos; C. Rodríguez-tajes; T. Roger; F. Rotaru; M. Sénoville; N. De Séréville; R. Smith; O. Sorlin; M. Stanoiu; I. Stefan; C. Stodel; D. Suzuki; T. Suzuki; J.c. Thomas; N. Timofeyuk; M. Vandebrouck; J. Walshe; C. Wheldon

doi:10.1016/j.physletb.2020.135939

Low-lying single-particle structure of ¹⁷C and the N = 14 sub-shell closure

X. Pereira-lópez, B. Fernández-domínguez, F. Delaunay, N.l. Achouri, N.a. Orr, W.n. Catford, M. Assié, S. Bailey, B. Bastin, Y. Blumenfeld, R. Borcea, M. Caamaño, L. Caceres, E. Clément, A. Corsi, N. Curtis, Q. Deshayes, F. Farget, M. Fisichella, G. De FranceS. Franchoo, M. Freer, J. Gibelin, A. Gillibert, G.f. Grinyer, F. Hammache, O. Kamalou, A. Knapton, T. Kokalova, V. Lapoux, J.a. Lay, B. Le Crom, S. Leblond, J. Lois-fuentes, F.m. Marqués, A. Matta, P. Morfouace, A.m. Moro, T. Otsuka, J. Pancin, L. Perrot, J. Piot, E. Pollacco, D. Ramos, C. Rodríguez-tajes, T. Roger, F. Rotaru, M. Sénoville, N. De Séréville, R. Smith, O. Sorlin, M. Stanoiu, I. Stefan, C. Stodel, D. Suzuki, T. Suzuki, J.c. Thomas, N. Timofeyuk, M. Vandebrouck, J. Walshe, C. Wheldon

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Abstract

The first investigation of the single-particle structure of the bound states of ¹⁷C, via the d(¹⁶C,p) transfer reaction, has been undertaken. The measured angular distributions confirm the spin-parity assignments of 1/2⁺ and 5/2⁺ for the excited states located at 217 and 335 keV, respectively. The spectroscopic factors deduced for these states exhibit a marked single-particle character, in agreement with shell model and particle-core model calculations, and combined with their near degeneracy in energy provide clear evidence for the absence of the N=14 sub-shell closure. The very small spectroscopic factor found for the 3/2⁺ ground state is consistent with theoretical predictions and indicates that the ν1d_3/2 strength is carried by unbound states. With a dominant ℓ=0 valence neutron configuration and a very low separation energy, the 1/2⁺ excited state is a one-neutron halo candidate.

Original language	English
Article number	135939
Number of pages	7
Journal	Physics Letters B
Volume	811
Early online date	11 Nov 2020
DOIs	https://doi.org/10.1016/j.physletb.2020.135939
Publication status	Published - 10 Dec 2020

Bibliographical note

Funding Information:
X.P.L. wishes to acknowledge the financial support of an IN2P3/CNRS (France) doctoral fellowship, from the National Nuclear Security Administration under the Stewardship Science Academic Alliance program through DOE Cooperative Agreement No. DE-NA0002132 and from the UKRI Science and Technology Facilities Council grant ST/P003885 . B.F.D. and M.C.F. acknowledge financial support from the Ramón y Cajal programme RYC-2010-06484 and RYC-2012-11585 and from the Spanish MINECO grant No. FPA2013-46236-P . This work is partly supported by MINECO (Spain) grant 2011-AIC-D-2011-0802 and PGC2018-096717-B-C22 and by the Xunta de Galicia through the grant EM2013/039 . W.N.C. and A.M. acknowledge financial support from the STFC grant number ST/L005743/1 . A. Moro and J.A. Lay acknowledge the Spanish Ministerio de Ciencia, Innovación y Universidades and FEDER funds under project FIS2017-88410-P and RTI2018-098117-B-C21 and the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 654002 . The authors acknowledge the support provided by the technical staff of LPC-Caen and GANIL. The participants from the Universities of Birmingham and Surrey, as well as the INFN and IFIN-HH laboratories also acknowledge partial support from the European Community within the FP6 contract EURONS RII3-CT-2004-06065 .

Publisher Copyright:
© 2020 The Authors

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Cite this

Pereira-lópez, X., Fernández-domínguez, B., Delaunay, F., Achouri, N. L., Orr, N. A., Catford, W. N., Assié, M., Bailey, S., Bastin, B., Blumenfeld, Y., Borcea, R., Caamaño, M., Caceres, L., Clément, E., Corsi, A., Curtis, N., Deshayes, Q., Farget, F., Fisichella, M., ... Wheldon, C. (2020). Low-lying single-particle structure of ¹⁷C and the N = 14 sub-shell closure. Physics Letters B, 811, Article 135939. https://doi.org/10.1016/j.physletb.2020.135939

@article{f607693c072f42ed862900b4e64afe25,

title = "Low-lying single-particle structure of 17C and the N = 14 sub-shell closure",

abstract = "The first investigation of the single-particle structure of the bound states of 17C, via the d(16C,p) transfer reaction, has been undertaken. The measured angular distributions confirm the spin-parity assignments of 1/2+ and 5/2+ for the excited states located at 217 and 335 keV, respectively. The spectroscopic factors deduced for these states exhibit a marked single-particle character, in agreement with shell model and particle-core model calculations, and combined with their near degeneracy in energy provide clear evidence for the absence of the N=14 sub-shell closure. The very small spectroscopic factor found for the 3/2+ ground state is consistent with theoretical predictions and indicates that the ν1d3/2 strength is carried by unbound states. With a dominant ℓ=0 valence neutron configuration and a very low separation energy, the 1/2+ excited state is a one-neutron halo candidate. ",

author = "X. Pereira-l{\'o}pez and B. Fern{\'a}ndez-dom{\'i}nguez and F. Delaunay and N.l. Achouri and N.a. Orr and W.n. Catford and M. Assi{\'e} and S. Bailey and B. Bastin and Y. Blumenfeld and R. Borcea and M. Caama{\~n}o and L. Caceres and E. Cl{\'e}ment and A. Corsi and N. Curtis and Q. Deshayes and F. Farget and M. Fisichella and {De France}, G. and S. Franchoo and M. Freer and J. Gibelin and A. Gillibert and G.f. Grinyer and F. Hammache and O. Kamalou and A. Knapton and T. Kokalova and V. Lapoux and J.a. Lay and {Le Crom}, B. and S. Leblond and J. Lois-fuentes and F.m. Marqu{\'e}s and A. Matta and P. Morfouace and A.m. Moro and T. Otsuka and J. Pancin and L. Perrot and J. Piot and E. Pollacco and D. Ramos and C. Rodr{\'i}guez-tajes and T. Roger and F. Rotaru and M. S{\'e}noville and {De S{\'e}r{\'e}ville}, N. and R. Smith and O. Sorlin and M. Stanoiu and I. Stefan and C. Stodel and D. Suzuki and T. Suzuki and J.c. Thomas and N. Timofeyuk and M. Vandebrouck and J. Walshe and C. Wheldon",

note = "Funding Information: X.P.L. wishes to acknowledge the financial support of an IN2P3/CNRS (France) doctoral fellowship, from the National Nuclear Security Administration under the Stewardship Science Academic Alliance program through DOE Cooperative Agreement No. DE-NA0002132 and from the UKRI Science and Technology Facilities Council grant ST/P003885 . B.F.D. and M.C.F. acknowledge financial support from the Ram{\'o}n y Cajal programme RYC-2010-06484 and RYC-2012-11585 and from the Spanish MINECO grant No. FPA2013-46236-P . This work is partly supported by MINECO (Spain) grant 2011-AIC-D-2011-0802 and PGC2018-096717-B-C22 and by the Xunta de Galicia through the grant EM2013/039 . W.N.C. and A.M. acknowledge financial support from the STFC grant number ST/L005743/1 . A. Moro and J.A. Lay acknowledge the Spanish Ministerio de Ciencia, Innovaci{\'o}n y Universidades and FEDER funds under project FIS2017-88410-P and RTI2018-098117-B-C21 and the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 654002 . The authors acknowledge the support provided by the technical staff of LPC-Caen and GANIL. The participants from the Universities of Birmingham and Surrey, as well as the INFN and IFIN-HH laboratories also acknowledge partial support from the European Community within the FP6 contract EURONS RII3-CT-2004-06065 . Publisher Copyright: {\textcopyright} 2020 The Authors",

year = "2020",

month = dec,

day = "10",

doi = "10.1016/j.physletb.2020.135939",

language = "English",

volume = "811",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

}

Pereira-lópez, X, Fernández-domínguez, B, Delaunay, F, Achouri, NL, Orr, NA, Catford, WN, Assié, M, Bailey, S, Bastin, B, Blumenfeld, Y, Borcea, R, Caamaño, M, Caceres, L, Clément, E, Corsi, A, Curtis, N, Deshayes, Q, Farget, F, Fisichella, M, De France, G, Franchoo, S, Freer, M, Gibelin, J, Gillibert, A, Grinyer, GF, Hammache, F, Kamalou, O, Knapton, A, Kokalova, T, Lapoux, V, Lay, JA, Le Crom, B, Leblond, S, Lois-fuentes, J, Marqués, FM, Matta, A, Morfouace, P, Moro, AM, Otsuka, T, Pancin, J, Perrot, L, Piot, J, Pollacco, E, Ramos, D, Rodríguez-tajes, C, Roger, T, Rotaru, F, Sénoville, M, De Séréville, N, Smith, R, Sorlin, O, Stanoiu, M, Stefan, I, Stodel, C, Suzuki, D, Suzuki, T, Thomas, JC, Timofeyuk, N, Vandebrouck, M, Walshe, J & Wheldon, C 2020, 'Low-lying single-particle structure of ¹⁷C and the N = 14 sub-shell closure', Physics Letters B, vol. 811, 135939. https://doi.org/10.1016/j.physletb.2020.135939

TY - JOUR

T1 - Low-lying single-particle structure of 17C and the N = 14 sub-shell closure

AU - Pereira-lópez, X.

AU - Fernández-domínguez, B.

AU - Delaunay, F.

AU - Achouri, N.l.

AU - Orr, N.a.

AU - Catford, W.n.

AU - Assié, M.

AU - Bailey, S.

AU - Bastin, B.

AU - Blumenfeld, Y.

AU - Borcea, R.

AU - Caamaño, M.

AU - Caceres, L.

AU - Clément, E.

AU - Corsi, A.

AU - Curtis, N.

AU - Deshayes, Q.

AU - Farget, F.

AU - Fisichella, M.

AU - De France, G.

AU - Franchoo, S.

AU - Freer, M.

AU - Gibelin, J.

AU - Gillibert, A.

AU - Grinyer, G.f.

AU - Hammache, F.

AU - Kamalou, O.

AU - Knapton, A.

AU - Kokalova, T.

AU - Lapoux, V.

AU - Lay, J.a.

AU - Le Crom, B.

AU - Leblond, S.

AU - Lois-fuentes, J.

AU - Marqués, F.m.

AU - Matta, A.

AU - Morfouace, P.

AU - Moro, A.m.

AU - Otsuka, T.

AU - Pancin, J.

AU - Perrot, L.

AU - Piot, J.

AU - Pollacco, E.

AU - Ramos, D.

AU - Rodríguez-tajes, C.

AU - Roger, T.

AU - Rotaru, F.

AU - Sénoville, M.

AU - De Séréville, N.

AU - Smith, R.

AU - Sorlin, O.

AU - Stanoiu, M.

AU - Stefan, I.

AU - Stodel, C.

AU - Suzuki, D.

AU - Suzuki, T.

AU - Thomas, J.c.

AU - Timofeyuk, N.

AU - Vandebrouck, M.

AU - Walshe, J.

AU - Wheldon, C.

N1 - Funding Information: X.P.L. wishes to acknowledge the financial support of an IN2P3/CNRS (France) doctoral fellowship, from the National Nuclear Security Administration under the Stewardship Science Academic Alliance program through DOE Cooperative Agreement No. DE-NA0002132 and from the UKRI Science and Technology Facilities Council grant ST/P003885 . B.F.D. and M.C.F. acknowledge financial support from the Ramón y Cajal programme RYC-2010-06484 and RYC-2012-11585 and from the Spanish MINECO grant No. FPA2013-46236-P . This work is partly supported by MINECO (Spain) grant 2011-AIC-D-2011-0802 and PGC2018-096717-B-C22 and by the Xunta de Galicia through the grant EM2013/039 . W.N.C. and A.M. acknowledge financial support from the STFC grant number ST/L005743/1 . A. Moro and J.A. Lay acknowledge the Spanish Ministerio de Ciencia, Innovación y Universidades and FEDER funds under project FIS2017-88410-P and RTI2018-098117-B-C21 and the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 654002 . The authors acknowledge the support provided by the technical staff of LPC-Caen and GANIL. The participants from the Universities of Birmingham and Surrey, as well as the INFN and IFIN-HH laboratories also acknowledge partial support from the European Community within the FP6 contract EURONS RII3-CT-2004-06065 . Publisher Copyright: © 2020 The Authors

PY - 2020/12/10

Y1 - 2020/12/10

N2 - The first investigation of the single-particle structure of the bound states of 17C, via the d(16C,p) transfer reaction, has been undertaken. The measured angular distributions confirm the spin-parity assignments of 1/2+ and 5/2+ for the excited states located at 217 and 335 keV, respectively. The spectroscopic factors deduced for these states exhibit a marked single-particle character, in agreement with shell model and particle-core model calculations, and combined with their near degeneracy in energy provide clear evidence for the absence of the N=14 sub-shell closure. The very small spectroscopic factor found for the 3/2+ ground state is consistent with theoretical predictions and indicates that the ν1d3/2 strength is carried by unbound states. With a dominant ℓ=0 valence neutron configuration and a very low separation energy, the 1/2+ excited state is a one-neutron halo candidate.

AB - The first investigation of the single-particle structure of the bound states of 17C, via the d(16C,p) transfer reaction, has been undertaken. The measured angular distributions confirm the spin-parity assignments of 1/2+ and 5/2+ for the excited states located at 217 and 335 keV, respectively. The spectroscopic factors deduced for these states exhibit a marked single-particle character, in agreement with shell model and particle-core model calculations, and combined with their near degeneracy in energy provide clear evidence for the absence of the N=14 sub-shell closure. The very small spectroscopic factor found for the 3/2+ ground state is consistent with theoretical predictions and indicates that the ν1d3/2 strength is carried by unbound states. With a dominant ℓ=0 valence neutron configuration and a very low separation energy, the 1/2+ excited state is a one-neutron halo candidate.

UR - http://www.scopus.com/inward/record.url?scp=85096695584&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2020.135939

DO - 10.1016/j.physletb.2020.135939

M3 - Article

SN - 0370-2693

VL - 811

JO - Physics Letters B

JF - Physics Letters B

M1 - 135939

ER -

Low-lying single-particle structure of 17C and the N = 14 sub-shell closure