Single-particle and collective motions from nuclear many-body correlation (PCM2025)

Collectivity along Ti isotopes towards N=40

5 Mar 2025, 15:13

1m

Main Lecture Hall (University of Aizu)

Poster session

Speaker

Asahi Kohda (RCNP, Osaka University)

Description

We have performed a Coulomb excitation experiment of ${}^{58}\mathrm{T}\mathrm{i}$ and
determined its $B(\mathrm{E}2)$ value to study the evolution of collectivity in
the Ti isotopes towards $N=40$.
The neutron number $N=40$ is a magic
number in the harmonic oscillator model.
However, the magic character is not observed in most nuclei because of the
narrowing of the shell gap due to spin-orbit interaction.
One exception is the proton magic nickel isotope with $N=40$ (${}^{68}\mathrm{N}\mathrm{i}$),
which shows magic nature having small collectivity compared to
the surrounding Ni isotopes.
Fe($Z=26$) and Cr($Z=24$) at $N=40$ recover large collectivity again.
It is interesting to see if the magic
nature restores again or not in Ti isotopes ($Z=22$) located near the lower
edge ($Z=20$) of the ${\mathrm{f}}_{7/2}$ shell. For the Ti isotopes, $B(\mathrm{E}2)$ values,
which are the most direct indicators of collectivity, have been
obtained up to ${}^{54}\mathrm{T}\mathrm{i}$ with $N=32$. The Coulomb excitation experiment
was performed at RIBF using the HiCARI array consisting of the
MiniBall clusters, Clover detectors, and Tracking Ge detectors. In
this presentation, I will talk about the result of this experiment.

Presentation materials

会津ポスター - Asahi Kohda.pdf