Structure of states in with major components of the neutron particlehole configuration

A Heusler (1) , T Faestermann (2) , R Hertenberger (3) , R Krücken (2, 4) , H-F Wirth (3) , P von Brentano (5)

1 MPIK - Max-Planck-Institut für Kernphysik
2 Physik Department E12
3 Fakultät für Physik
4 TRIUMF [Vancouver]
5 Institut für Kernphysik der Universität zu Köln

Using the 208 reaction via isobaric analog resonances in 209 Bi, a dozen states in the doubly magic nucleus 208 Pb with major strength of the neutron particle-hole configuration ν(d 5/2 +1 p 3/2 −1) are investigated. Among them, two doublets at Ex = 5.81, 6.01 MeV are resolved by comparing the mean cross sections on the d 5/2 resonance. The 5.81 MeV doublet consists of two states with major configuration ν(d 5/2 +1 p 3/2 −1) and spins 2 − and 3 − ; the 2 − state is newly identified. The distance between the two states is 0.4 ± 0.2 keV. The 6.01 MeV doublet consists of a 4 − state with dominant configuration ν(d 5/2 +1 p 3/2 −1) and a 3 − state with a small admixture of ν(d 5/2 +1 p 3/2 −1). The distance between the two states is 1.8 ± 0.3 keV. The 5886 state has been newly assigned the spin of 4 −. The spins of seven more states are verified. Almost the complete ν(d 5/2 +1 p 3/2 −1) strength is identified in these twelve states. The center of gravity for the configuration ν(d 5/2 +1 p 1/2 −1) and ν(d 5/2 +1 p 3/2 −1) is in line with the predictions by the shell model without residual interaction to within 10 keV.

Mots clés: Physical Sciences

A Heusler, T Faestermann, R Hertenberger, R Krücken, H-F Wirth, et al.. Structure of states in with major components of the neutron particlehole configuration. Journal of Physics G: Nuclear and Particle Physics, 2011, 38 (10), pp.105102. ⟨10.1088/0954-3899/38/10/105102⟩. ⟨hal-00655649⟩