Large Shape Staggering in Neutron-Deficient Bi Isotopes

• Published in: Physical review letters Vol. 127; no. 19; p. 192501
• Main Authors: Barzakh, A., Andreyev, A. N., Raison, C., Cubiss, J. G., Van Duppen, P., Péru, S., Hilaire, S., Goriely, S., Andel, B., Antalic, S., Al Monthery, M., Berengut, J. C., Bieroń, J., Bissell, M. L., Borschevsky, A., Chrysalidis, K., Cocolios, T. E., Day Goodacre, T., Dognon, J.-P., Elantkowska, M., Eliav, E., Farooq-Smith, G. J., Fedorov, D. V., Fedosseev, V. N., Gaffney, L. P., Garcia Ruiz, R. F., Godefroid, M., Granados, C., Harding, R. D., Heinke, R., Huyse, M., Karls, J., Larmonier, P., Li, J. G., Lynch, K. M., Maison, D. E., Marsh, B. A., Molkanov, P., Mosat, P., Oleynichenko, A. V., Panteleev, V., Pyykkö, P., Reitsma, M. L., Rezynkina, K., Rossel, R. E., Rothe, S., Ruczkowski, J., Schiffmann, S., Seiffert, C., Seliverstov, M. D., Sels, S., Skripnikov, L. V., Stryjczyk, M., Studer, D., Verlinde, M., Wilman, S., Zaitsevskii, A. V.
• Format: Journal Article
• Language: English
• Published: College Park American Physical Society 05-11-2021
• Subjects: Bismuth isotopes; Charge radius; Chemical Sciences; Dipole moments; Dipole-quadrupole; Electric quadrupole moment; Elementary excitations; Ground state; Isomer shifts; Isomeric state; Isomers; Isotopes; Magnetic dipoles; Magnetic moments; Material chemistry; Mean-field calculations; Mean-square; Mercury isotopes; Mossbauer spectroscopy; Neutron number; or physical chemistry; Quadrupoles; Quasiparticles; Resonance ionization spectroscopy; Staggering; Subatomic Physics; Subatomär fysik; Theoretical and
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.127.192501

The changes in the mean-square charge radius (relative to 209Bi), magnetic dipole, and electric quadrupole moments of 187, 188, 189, 191Bi were measured using the in-source resonance-ionization spectroscopy technique at ISOLDE (CERN). A large staggering in radii was found in 187, 188, 189Big, manifested by a sharp radius increase for the ground state of 188Bi relative to the neighboring 187, 189Big. A large isomer shift was also observed for 188Bim. Both effects happen at the same neutron number, N = 105 , where the shape staggering and a similar isomer shift were observed in the mercury isotopes. Experimental results are reproduced by mean-field calculations where the ground or isomeric states were identified by the blocked quasiparticle configuration compatible with the observed spin, parity, and magnetic moment.