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One-neutron knockout from 51-55Sc

Schwertel, S, Maierbeck, P, Krucken, R, Gernhauser, R, Kroll, T, Alvarez-Pol, H, Aksouh, F, Aumann, T, Behr, K, Benjamim, EA , Benlliure, J, Bildstein, V, Bohmer, M, Boretzky, K, Borge, MJG, Brunle, A, Burger, A, Caamano, M, Casarejos, E, Chatillon, A, Chulkov, LV, Cortina-Gil, D, Enders, J, Eppinger, K, Faestermann, T, Friese, J, Fabbietti, L, Gascon, 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, LeBleis, 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, Schaner, H, Schrieder, G, Simon, H, Sitar, B, Stanoiu, M, Summerer, K, Tengblad, O, Weick, H, Winkler, S, Brown, BA, Otsuka, T, Tostevin, JA and Rae, WDM (2012) One-neutron knockout from 51-55Sc European Physical Journal A: Hadrons and Nuclei, 48 (12), 191.

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Abstract

Results are presented from a one-neutron knockout experiment at relativistic energies of $ \approx 420 A$ MeV 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 $ \nu p_{1/2}$ , $ \nu p_{3/2}$ , (L = 1 and $ \nu f_{7/2}$ , $ \nu f_{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 $ \nu f_{7/2}$ to the $ \nu p_{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_{low k}$ obtained by evolving a chiral N3LO nucleon-nucleon potential.

Item Type: Article
Authors :
NameEmailORCID
Schwertel, S
Maierbeck, P
Krucken, R
Gernhauser, R
Kroll, T
Alvarez-Pol, H
Aksouh, F
Aumann, T
Behr, K
Benjamim, EA
Benlliure, J
Bildstein, V
Bohmer, M
Boretzky, K
Borge, MJG
Brunle, A
Burger, A
Caamano, M
Casarejos, E
Chatillon, A
Chulkov, LV
Cortina-Gil, D
Enders, J
Eppinger, K
Faestermann, T
Friese, J
Fabbietti, L
Gascon, 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
LeBleis, 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
Schaner, H
Schrieder, G
Simon, H
Sitar, B
Stanoiu, M
Summerer, K
Tengblad, O
Weick, H
Winkler, S
Brown, BA
Otsuka, T
Tostevin, JA
Rae, WDM
Date : 20 December 2012
Identification Number : 10.1140/epja/i2012-12191-5
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 14:14
Last Modified : 31 Oct 2017 14:55
URI: http://epubs.surrey.ac.uk/id/eprint/745512

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