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https://hdl.handle.net/2115/88908

Cluster formation in neutron-rich Be and B isotopes

英語

2022-11

Oxford University Press

Progress of theoretical and experimental physics

2022(11)

113D01

Evaluating the formation of clusters in finite and infinite nuclear systems is a fundamental problem in nuclear physics, and the variation in clustering in the isotope chain up to the neutron drip-line is one such intriguing phenomenon. Recently, experiments performed using the (p, p alpha) reactions have revealed a negative correlation between alpha-cluster formation and neutron number in Sn isotopes, showing a trend opposite to that theoretically predicted for Be and B isotopes. Although the observed charge radii of the Be and B isotopes suggest the formation of clusters as the neutron drip-line is approached, these radii themselves arc not a physical quantity that can directly probe the cluster structure. Here, we directly investigate the cluster formation in Be and B isotopes to elucidate the possibility of clustering as the neutron drip-line is approached. It has been shown that the sum of the S-factors (i.e., S(alpha), S(He-6), and S(He-8)) increases as the neutron drip-line approaches, in agreement with those of previous studies. The results indicate that the excess neutrons contribute to the formation of He-6 and He-8 clusters as well as alpha clusters. Thus, S(alpha) is not sufficient to estimate the enhancement of clustering in Be and B isotopes.

学術雑誌論文

Version of Record

2050-3911