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One-neutron knockout from Sc51-55

S. Schwertel ; P. Maierbeck ; R. Krucken ; R. Gernhauser ; T. Kroll ; H. Alvarez-Pol ; F. Aksouh ; T. Aumann ; K. Behr ; E. A. Benjamim ; J. Benlliure ; V. Bildstein ; M. Bohmer ; K. Boretzky ; M. J. G. Borge ; A. Brunle ; A. Burger ; M. Caamano ; E. Casarejos ; A. Chatillon ; L. V. Chulkov ; D. Cortina-Gil ; J. Enders ; K. Eppinger ; T. Faestermann ; J. Friese ; L. Fabbietti ; M. Gascon ; H. Geissel ; J. Gerl ; M. Gorska ; P. G. Hansen ; Björn Jonson (Institutionen för fundamental fysik, Subatomär fysik) ; R. Kanungo ; O. Kiselev ; I. Kojouharov ; A. Klimkiewicz ; T. Kurtukian ; N. Kurz ; Kristian Larsson (Institutionen för fundamental fysik, Subatomär fysik) ; T. Le Bleis ; K. Mahata ; L. Maier ; Thomas Nilsson (Institutionen för fundamental fysik, Subatomär fysik) ; C. Nociforo ; Göran Nyman (Institutionen för fundamental fysik, Subatomär fysik) ; 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. Suemmerer ; Olof Tengblad ; H. Weick ; S. Winkler ; B. A. Brown ; T. Otsuka ; J. A. Tostevin ; W. D. M. Rae
European Physical Journal A (1434-6001). Vol. 48 (2012), Dec., p. 191.
[Artikel, refereegranskad vetenskaplig]

Results are presented from a one-neutron knockout experiment at relativistic energies of approximate to 420 A MeV on Sc51-55 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-lowk obtained by evolving a chiral N3LO nucleon-nucleon potential.

Nyckelord: exotic nuclei, shell-model, heavy-ions, ti-55, n=32



Denna post skapades 2013-02-07. Senast ändrad 2014-09-02.
CPL Pubid: 173277

 

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Institutioner (Chalmers)

Institutionen för fundamental fysik, Subatomär fysik (2005-2013)

Ämnesområden

Fysik
Subatomär fysik
Kärnfysik
Mellanenergifysik

Chalmers infrastruktur