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. 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

Chair of Experimentalphysik - Dense and Strange Hadronic Matter

Technical University of Munich
TRIUMF
University of British Columbia
Technische Universität Darmstadt
Universidad de Santiago de Compostela
GSI Helmholtz Center
Instituto de Estructura de la Materia (IEM-CSIC)
University of Oslo
CEA Saclay
University of Vigo
Michigan State University
Chalmers University of Technology
Saint Mary's University
Johannes Gutenberg University
Paul Scherrer Institut
Institut Pluridisciplinaire Hubert Curien
Comenius University
University of Tokyo
University of Surrey

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

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",

publisher = "Springer",

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 - https://www.scopus.com/pages/publications/84875314657

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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