The first International African Symposium on Exotic Nuclei IASEN2013

Local suppression of collectivity in the N=80 isotones at the Z=58 subshell closure

5 Dec 2013, 15:15

20m

Oral Nuclear Physics: Parallel Session I

Speaker

Mr Christopher Bauer (TU Darmstadt)

Description

Recent data on transition strengths, namely the hitherto unknown B(E2) values of radioactive Nd-140 and Sm-142 in the N=80 isotones, have suggested that the proton 1g7/2 subshell closure at Z=58 has an impact on the properties of low-lying collective states [1,2]. The unstable, neutron-rich nuclei Nd-140 and Sm-142 were investigated via projectile Coulomb excitation at the REX-ISOLDE facility at CERN with the high-purity Germanium detector array MINIBALL. The measurements demonstrate that the reduced collectivity of Ce-138 is a local effect possibly due to the Z=58 subshell closure and requests refined theoretical calculations. The latter predict a smoothly increasing trend [3,4]. [1] C. Bauer et al., submitted to Phys. Rev. C (2013) [2] G. Rainovski et al., Phys. Rev. Lett. 96 (2006) 122501 [3] D. Bianco et al., Phys. Rev. C 85 (2012) 034332 [4] Ch. Stoyanov, private communication Supported by the BMBF (05P12RDCIB) and ENSAR