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Type Seminar
Date May 29, 2024 - 11:00
Time 11:00
Location Room 105, GANIL, Caen | France
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Alpha-decay in the complex energy shell model

Alan Dassie (GANIL, France)

Alpha emission from a nucleus is a fundamental decay process in which the alpha particle formed inside the nucleus tunnels out through the potential barrier. The renewed interest in the alpha-decay problem is stimulated by the recent experimental data above the Tin-100 that demonstrate the presence of very fast alpha decays [1-4].
A unified treatment of the alpha-decay from the complex shell model framework is possible using the Arima equation with the complete Berggren representation. On one hand, the formation process involves the structure calculation of a many-body overlap between the mother nucleus and the product’s decay. On the other hand, the penetration process needs to appeal to a resonant state. In general terms, processes relate to different aspects of nuclear physics: The former belongs to nuclear structure and the latter to nuclear reaction.
In this talk we will introduce the formalism of the alpha-decay in the complex energy shell model, and we will show the calculated alpha-decay half-lives and structural properties of the nuclei Titanium-44, Polonium-212 and the recently observed Tellurium-104.

[1] Z. Janas, C. Mazzocchi, L. Batist, et al, Eur. Phys. J. A 23, 197 (2005).
[2] S. N. Liddick, R. Grzywacz, C. Mazzocchi, et al, Phys. Rev. Lett. 97, 082501 (2006).

[3] K. Auranen, D. Seweryniak, M. Albers, et al, Physical Review Letters 121, 182501 (2018).
[4] Y. Xiao, S. Go, R. Grzywacz, et al, Physical Review C 100, 034315 (2019).