One-neutron knockout from 51-55Sc

S. Schwertel; P. Maierbeck; R. Krücken; R. Gernhäuser; T. Kröll; H. Alvarez-Pol; F. Aksouh; T. Aumann; K. Behr; E. A. Benjamim; J. Benlliure; V. Bildstein; M. Böhmer; K. Boretzky; M. J.G. Borge; A. Brünle; A. Bürger; M. Caamaño; E. Casarejos; A. Chatillon; L. V. Chulkov; D. Cortina-Gil; J. Enders; K. Eppinger; T. Faestermann; J. Friese; L. Fabbietti; M. Gasćon; H. Geissel; J. Gerl; M. Gorska; P. G. Hansen; B. Jonson; R. Kanungo; O. Kiselev; I. Kojouharov; A. Klimkiewicz; T. Kurtukian; N. Kurz; K. Larsson; T. Le Bleis; K. Mahata; L. Maier; T. Nilsson; C. Nociforo; G. Nyman; C. Pascual-Izarra; A. Perea; D. Perez; A. Prochazka; C. Rodriguez-Tajes; D. Rossi; H. Schaffner; G. Schrieder; H. Simon; B. Sitar; M. Stanoiu; K. Sümmerer; O. Tengblad; H. Weick; S. Winkler; B. A. Brown; T. Otsuka; J. A. Tostevin; W. D.M. Rae

doi:10.1140/epja/i2012-12191-5

One-neutron knockout from ^51-55Sc

S. Schwertel, P. Maierbeck, R. Krücken, R. Gernhäuser, T. Kröll, H. Alvarez-Pol, F. Aksouh, T. Aumann, K. Behr, E. A. Benjamim, J. Benlliure, V. Bildstein, M. Böhmer, K. Boretzky, M. J.G. Borge, A. Brünle, A. Bürger, M. Caamaño, E. Casarejos, A. ChatillonL. V. Chulkov, D. Cortina-Gil, J. Enders, K. Eppinger, T. Faestermann, J. Friese, L. Fabbietti, M. Gasćon, H. Geissel, J. Gerl, M. Gorska, P. G. Hansen, B. Jonson, R. Kanungo, O. Kiselev, I. Kojouharov, A. Klimkiewicz, T. Kurtukian, N. Kurz, K. Larsson, T. Le Bleis, K. Mahata, L. Maier, T. Nilsson, C. Nociforo, G. Nyman, C. Pascual-Izarra, A. Perea, D. Perez, A. Prochazka, C. Rodriguez-Tajes, D. Rossi, H. Schaffner, G. Schrieder, H. Simon, B. Sitar, M. Stanoiu, K. Sümmerer, O. Tengblad, H. Weick, S. Winkler, B. A. Brown, T. Otsuka, J. A. Tostevin, W. D.M. Rae

Chair of Experimentalphysik - Dense and Strange Hadronic Matter

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Abstract

Results are presented from a one-neutron knockout experiment at relativistic energies of ≈ 420AMeV on ^51-55Sc using the GSI Fragment Separator as a two-stage magnetic spectrometer and the Miniball array for gamma-ray detection. Inclusive longitudinal momentum distributions and cross-sections were measured enabling the determination of the contributions corresponding to knockout from the νp_1/2, νp_3/2, (L = 1) and νf_7/2, νf_5/2 (L = 3) neutron orbitals. The observed L = 1 and L = 3 contributions are compared with theoretical cross-sections using eikonal knockout theory and spectroscopic factors from shell model calculations using the GXPF1A interaction. The measured inclusive knockout cross-sections generally follow the trends expected theoretically and given by the spectroscopic strength predicted from the shell model calculations. However, the deduced L = 1 cross-sections are generally 30-40% higher while the L = 3 contributions are about a factor of two smaller than predicted. This points to a promotion of neutrons from the νf_7/2 to the νp_3/2 orbital indicating a weakening of the N = 28 shell gap in these nuclei. While this is not predicted for the phenomenological GXPF1A interaction such a weakening is predicted by recent calculations using realistic low-momentum interactions V_lowk obtained by evolving a chiral N3LO nucleon-nucleon potential.

Original language	English
Article number	191
Pages (from-to)	1-10
Number of pages	10
Journal	European Physical Journal A
Volume	48
Issue number	12
DOIs	https://doi.org/10.1140/epja/i2012-12191-5
State	Published - 2012

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Schwertel, S., Maierbeck, P., Krücken, R., Gernhäuser, R., Kröll, T., Alvarez-Pol, H., Aksouh, F., Aumann, T., Behr, K., Benjamim, E. A., Benlliure, J., Bildstein, V., Böhmer, M., Boretzky, K., Borge, M. J. G., Brünle, A., Bürger, A., Caamaño, M., Casarejos, E., ... Rae, W. D. M. (2012). One-neutron knockout from ^51-55Sc. European Physical Journal A, 48(12), 1-10. Article 191. https://doi.org/10.1140/epja/i2012-12191-5

@article{0c68eed3c2e7400f8ca5f248f24d2669,

title = "One-neutron knockout from 51-55Sc",

abstract = "Results are presented from a one-neutron knockout experiment at relativistic energies of ≈ 420AMeV on 51-55Sc using the GSI Fragment Separator as a two-stage magnetic spectrometer and the Miniball array for gamma-ray detection. Inclusive longitudinal momentum distributions and cross-sections were measured enabling the determination of the contributions corresponding to knockout from the νp1/2, νp3/2, (L = 1) and νf7/2, νf5/2 (L = 3) neutron orbitals. The observed L = 1 and L = 3 contributions are compared with theoretical cross-sections using eikonal knockout theory and spectroscopic factors from shell model calculations using the GXPF1A interaction. The measured inclusive knockout cross-sections generally follow the trends expected theoretically and given by the spectroscopic strength predicted from the shell model calculations. However, the deduced L = 1 cross-sections are generally 30-40% higher while the L = 3 contributions are about a factor of two smaller than predicted. This points to a promotion of neutrons from the νf7/2 to the νp3/2 orbital indicating a weakening of the N = 28 shell gap in these nuclei. While this is not predicted for the phenomenological GXPF1A interaction such a weakening is predicted by recent calculations using realistic low-momentum interactions Vlowk obtained by evolving a chiral N3LO nucleon-nucleon potential.",

author = "S. Schwertel and P. Maierbeck and R. Kr{\"u}cken and R. Gernh{\"a}user and T. Kr{\"o}ll and H. Alvarez-Pol and F. Aksouh and T. Aumann and K. Behr and Benjamim, {E. A.} and J. Benlliure and V. Bildstein and M. B{\"o}hmer and K. Boretzky and Borge, {M. J.G.} and A. Br{\"u}nle and A. B{\"u}rger and M. Caama{\~n}o and E. Casarejos and A. Chatillon and Chulkov, {L. V.} and D. Cortina-Gil and J. Enders and K. Eppinger and T. Faestermann and J. Friese and L. Fabbietti and M. Gas{\'c}on and H. Geissel and J. Gerl and M. Gorska and Hansen, {P. G.} and B. Jonson and R. Kanungo and O. Kiselev and I. Kojouharov and A. Klimkiewicz and T. Kurtukian and N. Kurz and K. Larsson and {Le Bleis}, T. and K. Mahata and L. Maier and T. Nilsson and C. Nociforo and G. Nyman and C. Pascual-Izarra and A. Perea and D. Perez and A. Prochazka and C. Rodriguez-Tajes and D. Rossi and H. Schaffner and G. Schrieder and H. Simon and B. Sitar and M. Stanoiu and K. S{\"u}mmerer and O. Tengblad and H. Weick and S. Winkler and Brown, {B. A.} and T. Otsuka and Tostevin, {J. A.} and Rae, {W. D.M.}",

year = "2012",

doi = "10.1140/epja/i2012-12191-5",

language = "English",

volume = "48",

pages = "1--10",

journal = "European Physical Journal A",

issn = "1434-6001",

number = "12",

}

Schwertel, S, Maierbeck, P, Krücken, R, Gernhäuser, R, Kröll, T, Alvarez-Pol, H, Aksouh, F, Aumann, T, Behr, K, Benjamim, EA, Benlliure, J, Bildstein, V, Böhmer, M, Boretzky, K, Borge, MJG, Brünle, A, Bürger, A, Caamaño, M, Casarejos, E, Chatillon, A, Chulkov, LV, Cortina-Gil, D, Enders, J, Eppinger, K, Faestermann, T, Friese, J, Fabbietti, L, Gasćon, M, Geissel, H, Gerl, J, Gorska, M, Hansen, PG, Jonson, B, Kanungo, R, Kiselev, O, Kojouharov, I, Klimkiewicz, A, Kurtukian, T, Kurz, N, Larsson, K, Le Bleis, T, Mahata, K, Maier, L, Nilsson, T, Nociforo, C, Nyman, G, Pascual-Izarra, C, Perea, A, Perez, D, Prochazka, A, Rodriguez-Tajes, C, Rossi, D, Schaffner, H, Schrieder, G, Simon, H, Sitar, B, Stanoiu, M, Sümmerer, K, Tengblad, O, Weick, H, Winkler, S, Brown, BA, Otsuka, T, Tostevin, JA & Rae, WDM 2012, 'One-neutron knockout from ^51-55Sc', European Physical Journal A, vol. 48, no. 12, 191, pp. 1-10. https://doi.org/10.1140/epja/i2012-12191-5

TY - JOUR

T1 - One-neutron knockout from 51-55Sc

AU - Schwertel, S.

AU - Maierbeck, P.

AU - Krücken, R.

AU - Gernhäuser, R.

AU - Kröll, T.

AU - Alvarez-Pol, H.

AU - Aksouh, F.

AU - Aumann, T.

AU - Behr, K.

AU - Benjamim, E. A.

AU - Benlliure, J.

AU - Bildstein, V.

AU - Böhmer, M.

AU - Boretzky, K.

AU - Borge, M. J.G.

AU - Brünle, A.

AU - Bürger, A.

AU - Caamaño, M.

AU - Casarejos, E.

AU - Chatillon, A.

AU - Chulkov, L. V.

AU - Cortina-Gil, D.

AU - Enders, J.

AU - Eppinger, K.

AU - Faestermann, T.

AU - Friese, J.

AU - Fabbietti, L.

AU - Gasćon, M.

AU - Geissel, H.

AU - Gerl, J.

AU - Gorska, M.

AU - Hansen, P. G.

AU - Jonson, B.

AU - Kanungo, R.

AU - Kiselev, O.

AU - Kojouharov, I.

AU - Klimkiewicz, A.

AU - Kurtukian, T.

AU - Kurz, N.

AU - Larsson, K.

AU - Le Bleis, T.

AU - Mahata, K.

AU - Maier, L.

AU - Nilsson, T.

AU - Nociforo, C.

AU - Nyman, G.

AU - Pascual-Izarra, C.

AU - Perea, A.

AU - Perez, D.

AU - Prochazka, A.

AU - Rodriguez-Tajes, C.

AU - Rossi, D.

AU - Schaffner, H.

AU - Schrieder, G.

AU - Simon, H.

AU - Sitar, B.

AU - Stanoiu, M.

AU - Sümmerer, K.

AU - Tengblad, O.

AU - Weick, H.

AU - Winkler, S.

AU - Brown, B. A.

AU - Otsuka, T.

AU - Tostevin, J. A.

AU - Rae, W. D.M.

PY - 2012

Y1 - 2012

N2 - Results are presented from a one-neutron knockout experiment at relativistic energies of ≈ 420AMeV on 51-55Sc using the GSI Fragment Separator as a two-stage magnetic spectrometer and the Miniball array for gamma-ray detection. Inclusive longitudinal momentum distributions and cross-sections were measured enabling the determination of the contributions corresponding to knockout from the νp1/2, νp3/2, (L = 1) and νf7/2, νf5/2 (L = 3) neutron orbitals. The observed L = 1 and L = 3 contributions are compared with theoretical cross-sections using eikonal knockout theory and spectroscopic factors from shell model calculations using the GXPF1A interaction. The measured inclusive knockout cross-sections generally follow the trends expected theoretically and given by the spectroscopic strength predicted from the shell model calculations. However, the deduced L = 1 cross-sections are generally 30-40% higher while the L = 3 contributions are about a factor of two smaller than predicted. This points to a promotion of neutrons from the νf7/2 to the νp3/2 orbital indicating a weakening of the N = 28 shell gap in these nuclei. While this is not predicted for the phenomenological GXPF1A interaction such a weakening is predicted by recent calculations using realistic low-momentum interactions Vlowk obtained by evolving a chiral N3LO nucleon-nucleon potential.

AB - Results are presented from a one-neutron knockout experiment at relativistic energies of ≈ 420AMeV on 51-55Sc using the GSI Fragment Separator as a two-stage magnetic spectrometer and the Miniball array for gamma-ray detection. Inclusive longitudinal momentum distributions and cross-sections were measured enabling the determination of the contributions corresponding to knockout from the νp1/2, νp3/2, (L = 1) and νf7/2, νf5/2 (L = 3) neutron orbitals. The observed L = 1 and L = 3 contributions are compared with theoretical cross-sections using eikonal knockout theory and spectroscopic factors from shell model calculations using the GXPF1A interaction. The measured inclusive knockout cross-sections generally follow the trends expected theoretically and given by the spectroscopic strength predicted from the shell model calculations. However, the deduced L = 1 cross-sections are generally 30-40% higher while the L = 3 contributions are about a factor of two smaller than predicted. This points to a promotion of neutrons from the νf7/2 to the νp3/2 orbital indicating a weakening of the N = 28 shell gap in these nuclei. While this is not predicted for the phenomenological GXPF1A interaction such a weakening is predicted by recent calculations using realistic low-momentum interactions Vlowk obtained by evolving a chiral N3LO nucleon-nucleon potential.

UR - http://www.scopus.com/inward/record.url?scp=84875314657&partnerID=8YFLogxK

U2 - 10.1140/epja/i2012-12191-5

DO - 10.1140/epja/i2012-12191-5

M3 - Article

AN - SCOPUS:84875314657

SN - 1434-6001

VL - 48

SP - 1

EP - 10

JO - European Physical Journal A

JF - European Physical Journal A

IS - 12

M1 - 191

ER -

One-neutron knockout from ^51-55Sc

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