Phase transition in exotic nuclei along the $N=Z$ line

Abstract

The abrupt structure change from the nuclei of $N=Z\le 35$ to those of $N=Z\ge 36$ is investigated by means of shell model calculations. The basic features of the even-even and odd-odd nuclei under consideration are nicely reproduced. A sudden jump of nucleons into the upper $g_{9/2}{d}_{5/2}$ shell at $N=Z=36$ is found to be the main reason that causes the qualitative structure difference. It is argued that the structure change can be viewed as a decisive change of the mean field, or a phase transition, along the $N=Z$ line.

4 pages, 5 figures, submitted to Phys. Rev. Lett

References in corpus (1)

• Enhancement of $B(E2)$ and low excitation of the second 0${}^{+}$ state near N=40 in Ge isotopes

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