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Shape coexistence around Z=82

As the even-even nuclei around Z=82 go away from the N=126 shell closure towards the neutron-deficient region and the midshell value of N=104, intruder 0+ states appear at always lower energy. The proximity of those deformed states to the ground state induce mixing in all of them and therefore shape coexistence in the ground state. This effect is best illustrated by the triple shape coexistence of 186Pb[1].

Many techniques are used to observe such effect and an overview is shown below. The references refer to ongoing work, published litterature of Ph.D. theses.

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Ongoing research

[i] T.E. Cocolios. In-source laser spectroscopy of the polonium isotopic chain at ISOLDE. (IS456)

[ii] N. Bree. Coulomb excitation of the neutron-deficient mercury isotopes around N=104 midshell at ISOLDE. (IS452)

[iii] B. Bastin. Coulomb excitation of the neutron-deficient polonium isotopes towards N=104 midshell at ISOLDE.

Published theses

[X] P. Van Duppen. Laagenergetische 0+ toestanden in de semi-magische Pb kernen - Experimentele evidentie voor een éénvoormige beschrijving van normale en indringtoestanden. Ph.D. 1985, KULeuven.

[A] N. Bijnens. Intruder states in neutron-deficient even Po nuclei and the stability of the Z=82 shell closure. Ph.D. 1998, KULeuven.

[B] K. Van de Vel. Shape coexistence in netron-deficient polonium and lead isotopes. Ph.D. 2003, KULeuven.

[C] H. De Witte. Probing the nuclear structure along the Z=82 closed shell: decay and laser spectroscopic studies of exotic Pb, Bi and Po nuclei. Ph.D. 2004, KULeuven.

Publications

For a more extensive reference on the publications, please visit the Publications page.

 

[1] A.N. Andreyev et al. Nature 405:430-433 (2000)

[2] A.N. Andreyev et al. Zeitschrift für Physik A 358:63-68 (1997)

[3] N. Fotiades et al. Physical Review C 55:1724-1729 (1997)

[4] A.N. Andreyev et al. Journal of Physics G 25:835:837 (1999)

[5] A.N. Andreyev et al. European Journal of Physics A 6:381-385 (1999)

[6] M. Leino et al. Acta Physica Polonica B 30:1245-1254 (1999)

[7] P. Van Duppen and M. Huyse. Hyperfine Interactions 129:149-161 (2000)

[8] K. Van de Vel et al. European Journal of Physics A 17:167 (2002)

[9] A.N. Andreyev et al. Physical Review C 74:064303 (2006)

[10] S. Antalic et al. Acta Physica Polonica B 38:1557 (2007)

[11] H. De Witte et al. Physical Review Letters 98:112502 (2007)