Abstract
Charge-changing cross sections for on a carbon target at around 280 MeV/nucleon have been measured. Though the existing point-proton radii of Ca isotopes increase as the neutron number increases, the measured data show a significant decrease, which is against the expectation from a simple Glauber-like model. We found that this observed phenomenon could be attributed to the charged-particle evaporation effect induced by the neutron-removal reaction. By taking the evaporation effect into account, various data sets for nuclides from C to Fe isotopes on measured at around 280 MeV/nucleon are reproduced with a standard deviation of 1.6%. It is also clarified that this evaporation effect becomes negligibly small in the neutron-rich region. The evaluated relation between and using the current model indicates that data for neutron-rich Ca isotopes () are highly sensitive to . This high sensitivity potentially allows one to determine the of very neutron-rich nuclei.
10 More- Received 26 November 2021
- Revised 23 June 2022
- Accepted 8 July 2022
DOI:https://doi.org/10.1103/PhysRevC.106.014617
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