Coulomb excitation of Ca-44 and Ar-46

0459619 - ÚJF 2017 RIV US eng J - Článek v odborném periodiku
Calinescu, S. - Caceres, L. - Grévy, S. - Sorlin, O. - Dombradi, Z. - Stanoiu, M. - Astabatyan, R. - Borcea, C. - Borcea, R. - Bowry, M. - Catford, W. - Clement, E. - Franchoo, S. - Garcia, R. - Gillibert, R. - Guerin, I. H. - Kuti, I. - Lukyanov, S. - Lepailleur, A. - Maslov, V. - Morfouace, P. - Mrázek, Jaromír - Negoita, F. - Niikura, M. - Perrot, L. - Podolyak, Z. - Petrone, C. - Penionzhkevich, Y. E. - Roger, T. - Rotaru, F. - Sohler, D. - Stefan, I. - Thomas, J. C. - Vajta, Zs. - Wilson, E.
Coulomb excitation of Ca-44 and Ar-46.
Physical Review. C. Roč. 93, č. 4 (2016), s. 044333. ISSN 0556-2813
Institucionální podpora: RVO:61389005
Klíčová slova: neutron rich nuclei * low lying states * scattering
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 3.820, rok: 2016

The reduced transition probabilities B(E2; 0(g.s.)(+) -> 2(1)(+)) of the Ar-46 and Ca-44 nuclei were studied using the Coulomb excitation technique at intermediate energy at the LISE/GANIL facility. The in-flight gamma rays, emitted after the Coulomb excitation of their first 2(+) states, were detected in an array of 64 BaF2 crystals. The present B(E2 up arrow) value for Ca-44, 475(36) e(2)fm(4), agrees well with the value of 495(35) e(2)fm(4) obtained by averaging results of previous experiments. Consistent B(E2; 0(g.s.)(+) -> 2(1)(+)) values of 225(29) e(2)fm(4) and 234(19) e(2)fm(4) have been obtained for Ar-46 from an absolute and a relative measurement, normalized to the Ca-44 value. Both results agree with the ones obtained with the same experimental technique at the NSCL facility but are a factor of 2 smaller than the shell model predictions. The drop in B(E2; 0(g.s.)(+) -> 2(1)(+)) in the Ar chain at N = 28, confirmed in this experiment, shows that Ar-46 is sensitive to the N = 28 shell closure.
Trvalý link: http://hdl.handle.net/11104/0259783