Speaker
Description
Nuclear shape coexistence is essential for exploring the microscopic origins of nuclear deformation [1-4].
The Ca isotopic chain between the two shell closures at N=20 and N=28 is an optimal test
area that can provide key insights into this phenomenon [5-7].
The aim of this work is to perform complete low-spin spectroscopy of even-even $^{42,44}$Ca and odd-even $^{43,45}$Ca isotopes, complementary to the already existing data on $^{41,47,49}$Ca, and to search for evidences of shape coexistence phenomena in the $A \sim 40$ region.
As a first step, we focused on the two even-even cases of the isotopic chain, where the presence of $0^+$ excitations associated with deformed and superdeformed structures have already been demonstrated [8,9].
Both $^{42}$Ca and $^{44}$Ca nuclei were populated with a (n$_{th}$, $\gamma$) reaction on two CaCo$_3$ targets, the first one being enriched with the $^{41}$Ca radioactive isotope.
In both cases, the $\gamma$ cascades emitted from the S$_n$ capture states were detected using the 32 HPGe crystals array FIPPS [10], at ILL (Grenoble).
The results of this work are complex level schemes that will be presented together with preliminary angular correlation studies made to establish the spin and parities of several excited states of $^{42}$Ca and $^{44}$Ca nuclei.
References
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[3] S. Leoni et al. In: Progress in Particle and Nuclear Physics 139 (2024),p. 104119. issn: 0146-6410. doi: https://doi.org/10.1016/j.ppnp.2024.104119.
[4] S. Leoni et al. In: The European Physical Journal Special Topics 233(May 2024). doi: 10.1140/epjs/s11734-024-01175-6.
[5] J. D. Holt et al. In: Phys. Rev. C 90 (2 Aug. 2014), p. 024312. doi:10.1103/PhysRevC.90.024312.
[6] Y. Utsuno et al. In: Progress of Theoretical Physics Supplement 196(Oct. 2012), pp. 304–309. issn: 0375-9687. doi: 10.1143/PTPS.196.304.
[7] M. Bender, P. H. Heenen, and P. G. Reinhard. In: Rev. Mod. Phys.75 (1 Jan. 2003), pp. 121–180. doi: 10.1103/RevModPhys.75.121.
[8] K. Hady´nska-Klek et al. In: Phys. Rev. Lett. 117 (6 Aug. 2016),p. 062501. doi: 10.1103/PhysRevLett.117.062501.
[9] C.W. Towsley, D. Cline, and R.N. Horoshko. In: Nuclear Physics A204.3 (1973), pp. 574–592. doi: https://doi.org/10.1016/0375-9474(73)90396-5.
[10] C. Michelagnoli et al. In: EPJ Web Conf. 193 (2018), p. 04009. doi:10.1051/epjconf/201819304009.
