Abstract
Background: The hexadecapole deformation is usually difficult to determine experimentally, especially its sign. The rapidly accumulated knowledge of inspires the desire of for radioactive nuclei, but the current low-quality beam is a severe experimental challenge. Therefore, a simple but sensitive method to extract in such a condition is urgently called for.
Purpose: To study the feasibility of extracting from the lower-energy backward quasi-elastic (QEL) scattering.
Methods: The QEL scattering at sub-barrier energy region is sensitive to the coupled-channels (CC) effect and consequently may be used to extract . The QEL scattering excitation functions for ,, and were measured at a backward angle with small energy intervals at energies near the Coulomb barrier. Experimental fusion barrier distributions were also derived. The lower-energy data were analyzed to extract with the help of the CC calculations.
Results: The obtained agrees with the available results reasonably well.
Conclusions: We have demonstrated that the QEL scattering at sub-barrier energies provides a feasible and sensitive method to extract the value of , which is essentially meaningful for the radioactive nucleus because of its low beam intensity.
- Received 5 June 2014
- Revised 25 August 2014
DOI:https://doi.org/10.1103/PhysRevC.90.031601
©2014 American Physical Society