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=Date and Place=
Feb. 9th(Tue.) 13:30~ via ZOOM meeting system
=Lecturer=
Dr. Masaomi Tanaka
(Kyushu University)
=Title=
Swelling of Doubly Magic 48Ca Core in Ca Isotopes beyond N = 28
=Abstract=
Interaction cross sections for Ca on a carbon target at 280 MeV/nucleon have been measured for the first time. The neutron
number dependence of derived root-mean-square matter radii shows a significant increase beyond the neutron magic
number N = 28. Furthermore, this enhancement of matter radii is much larger than that of the previously measured charge
radii, indicating a novel growth in neutron skin thickness. A simple examination based on the Fermi-type distribution, and mean
field calculations point out that this anomalous enhancement of the nuclear size beyond N = 28 results from an enlargement
of the core by a sudden increase in the surface diffuseness of the neutron density distribution, which implies the swelling of
the bare 48Ca core in Ca isotopes beyond N = 28.
In this seminar, the evolution of nuclear radius of Ca isotopes will be presented in detail. Furthermore. the recent experimental
and theoretical progress for nuclear matter and charge radii across the magic number will be also discussed.
Reference
M. Tanaka, M. Takechi, A. Homma, M. Fukuda, D. Nishimura, T. Suzuki, Y. Tanaka, T. Moriguchi et al.,
Phys. Rev. Lett. 124, 102501 (2020).