Study of the N = 28 shell closure in the Ar isotopic chain A SPIRAL experiment for nuclear astrophysics - Archive ouverte HAL Access content directly
Conference Papers Year : 2006

Study of the N = 28 shell closure in the Ar isotopic chain A SPIRAL experiment for nuclear astrophysics

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Z. Dombrádi
  • Function : Author
J. Gibelin
K. Kemper
  • Function : Author
K. L. Kratz
  • Function : Author
S. M. Lukyanov
  • Function : Author
F. Nowacki
A. N. Ostrowski
  • Function : Author
Yu. -E. Penionzhkevich
  • Function : Author
J. A. Scarpaci
T. Rauscher
  • Function : Author
D. Sohler

Abstract

The structure of the neutron-rich nucleus $^{47}$Ar has been investigated through the d( $^{46}$Ar, $^{47}$Ar)p transfer reaction. The radioactive beam of $^{46}$Ar at 10A·MeV was provided by the SPIRAL facility at GANIL. The protons corresponding to a neutron pick-up on bound or unbound states mechanism in $^{47}$Ar nuclei were detected at backward angles by the position-sensitive Si array-detector MUST. The transfer-like ejectiles were detected in the SPEG spectrometer. Level scheme, spin assignments and spectroscopic factors have been deduced for $^{47}$Ar and compared to shell model predictions. They suggest a slight erosion of the N = 28 shell gap from the weakening of the spin-orbit interaction arising from the f and p orbitals. These spectroscopic information are subsequently used to infer (n,$\gamma$) reaction rates in the Ar isotopic chain to understand the origin of the $^{48}$Ca/ $^{46}$Ca abnormal isotopic ratio observed in certain inclusions of meteorites.

Dates and versions

in2p3-00025993 , version 1 (26-04-2006)

Identifiers

Cite

L. Gaudefroy, O. Sorlin, D. Beaumel, Y. Blumenfeld, Z. Dombrádi, et al.. Study of the N = 28 shell closure in the Ar isotopic chain A SPIRAL experiment for nuclear astrophysics. 2nd International Conference on Nuclear Physics in Astrophysics, May 2005, Debrecen, Hungary. pp.309-314, ⟨10.1140/epja/i2006-08-047-0⟩. ⟨in2p3-00025993⟩
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