DREB 2012 - Direct Reactions with Exotic Beams

Test of the asymmetry of reduction factors with one nucleon transfer reaction on 14O

29 Mar 2012, 11:50

20m

Aula Magna, Faculty of SMFN

Talk Session 12

Speaker

Alain Gillibert (CEA/IRFU/SPhN)

Description

Nucleon transfer reactions have been for years a powerful tool to investigate the filling of orbitals issued from the nuclear shell model. Even for the most stable nuclei, spectroscopic factors deviate from unity. It is understood as the result of short or long-range correlations. In the case of exotic nuclei, the variation of spectroscopic factors with the difference in separation energy ΔS = |Sn - Sp| is still an open question, but no strong effect was shown from transfer reaction [1]. However available data are restricted to a limited range in ΔS values. A different picture arises from the one nucleon knock-out performed at higher incident energy where a strong asymmetry was recently found [2] for the reduction factor of spectroscopic factors versus ΔS. As a spectroscopic factor is not an observable, it is important to disentangle structure effects from reaction mechanism. To investigate such an effect, we performed one nucleon transfer and knock-out experiments on the same nucleus 14O corresponding to large positive and negative ΔS values, large enough to significantly test the asymmetry. Transfer results will be shown and compared to previous data obtained for (d,p) transfer and Ar isotopes [1]. [1] J. Lee et al., Phys. Rev. C 83 (2011) 014606 [2] A. Gade et al., Phys. Rev. C 77 (2008) 044306