Abstract
The emergence of nuclear collectivity near doubly-magic 132Sn was explored along the stable, eveneven 124−130Te isotopes. Preliminary measurements of the B(E2; 41+ → 21+) transition strengths are reported from Coulomb excitation experiments primarily aimed at measuring the g factors of the 41+ states. Isotopically enriched Te targets were excited by 198-205 MeV 58Ni beams. A comparison of transition strengths obtained is made to large-scale shell-model calculations with successes and limitations discussed.
Highlights
Studies of the emergence of collective excitations across isotopic chains give essential information on the degrees of freedom important in creating nuclear collectivity and the nature of the collectivity that develops
Coulomb excitation is termed safe when there is no significant overlap of the projectile and target wavefunctions
The excitation occurs at ∼72-75% of the barrier and is not purely safe Coulomb excitation, which increases the uncertainty in the measured B(E2) values as the nuclear effects can interfere constructively or destructively
Summary
Studies of the emergence of collective excitations across isotopic chains give essential information on the degrees of freedom important in creating nuclear collectivity and the nature of the collectivity that develops. The stable even isotopes from 120Te to 130Te are two protons away from the Z=50 closed shell and the highest mass isotopes are close to the N=82 closed neutron shell. They can be compared to the Cd isotopes (Z=48) with two proton holes, which have been more extensively studied. The Te isotopes show increasing collectivity as they depart further from doubly-magic 132Sn. The large number of stable Te isotopes allows an extensive and systematic study of the emergence of collectivity across a single isotopic chain by Coulomb excitation
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