Shape coexistence at N=20 and N=28: Study of 0{sub 2}{sup +} states in {sup 34}Si and {sup 44}S

• Published in: AIP conference proceedings 2014-08, Vol.1609 (1)
• Main Authors: Grévy, S., Rotaru, F., Negoita, F., Borcea, C., Borcea, R., Buta, A., Calinescu, S., Petrone, C., Stanoiu, M., Mrazek, J., Lukyanov, S., Penionzhkevich, Y., Cáceres, L., De Oliveira, F., Force, C., Lebhertz, D., Sorlin, O., Stodel, C., Thomas, J. C., Chevrier, R.
• Format: Article
• Language: English
• Subjects: CALCIUM 48; MAGIC NUCLEI; MAGNESIUM 32; NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEAR STRUCTURE; SILICON 34; SILICON 42; SPECTROSCOPY; SULFUR 36; SULFUR 44
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.4893271

It is well known that the nuclear shell structure changes for the most exotic nuclei. One of the consequences of this phenomenon is the modification of the 'classical' magic numbers, as experimentally observed at N = 20 and N = 28. Nevertheless, the mechanisms responsible for such changes are still under discussion and more experimental information is needed to better constrain the theoretical models. In these proceedings, we report on the discovery and the experimental study by precise spectroscopy experiments of the 0{sub 2}{sup +} state in {sup 34}Si and {sup 44}S. The {sup 34}Si is located between the magic spherical {sup 36}S and the deformed {sup 32}Mg, member of the so-called island of inversion, whereas {sup 44}S is located between the magic spherical {sup 48}Ca and the deformed {sup 42}Si. Therefore, the structure of these nuclei, and in particular the phenomenon of shape coexistence, is of crucial importance to understand how the intruder configurations progressively dominate the ground state structure of the most exotic nuclei at both N = 20 and N = 28.