Electric dipole moments in {sup 230,232}U and implications for tetrahedral shapes

The nuclei {sup 230}U and {sup 232}U were populated in the compound nucleus reactions {sup 232}Th({alpha},6n) and {sup 232}Th({alpha},4n), respectively. Gamma rays from these nuclei were observed in coincidence with a recoil detector. A comprehensive set of in-band E2 transitions were observed in th...

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Veröffentlicht in:	Physical review. C, Nuclear physics Nuclear physics, 2010-10, Vol.82 (4)
Hauptverfasser:	Ntshangase, S. S., iThemba LABS, P.O. Box 722, Somerset West 7129, Bark, R. A., Datta, P., Lawrie, E. A., Lawrie, J. J., Lieder, R. M., Mullins, S. M., Aschman, D. G., Mohammed, H., Stankiewicz, M. A., Bvumbi, S., Masiteng, P. L., Shirinda, O., Department of Physics, University of the Western Cape, Bellville ZA-7535, Davidson, P. M., Nieminen, P., Wilson, A. N., Dinoko, T. S., Sharpey-Shafer, J. F., Elbasher, M. E. A., Department of Physics, University of Stellenbosch, 7601 Matieland, Juhasz, K.
Format:	Artikel
Sprache:	eng
Schlagworte:	ACTINIDE NUCLEI ALKALINE EARTH ISOTOPES ALPHA DECAY RADIOISOTOPES ALPHA REACTIONS CARBON 14 DECAY RADIOISOTOPES CHARGED-PARTICLE REACTIONS COINCIDENCE METHODS COMPOUND-NUCLEUS REACTIONS COUNTING TECHNIQUES DAYS LIVING RADIOISOTOPES DIPOLE MOMENTS E2-TRANSITIONS ELECTRIC DIPOLE MOMENTS ELECTRIC MOMENTS ELECTROMAGNETIC RADIATION EMISSION ENERGY ENERGY-LEVEL TRANSITIONS EVEN-EVEN NUCLEI GAMMA RADIATION HEAVY ION DECAY RADIOISOTOPES HEAVY NUCLEI INTERNAL CONVERSION RADIOISOTOPES IONIZING RADIATIONS ISOTONIC NUCLEI ISOTOPES MULTIPOLE TRANSITIONS NEON 24 DECAY RADIOISOTOPES NEUTRON EMISSION NUCLEAR PHYSICS AND RADIATION PHYSICS NUCLEAR REACTIONS NUCLEI PARITY PARTICLE PROPERTIES Q-VALUE RADIATIONS RADIOISOTOPES RADIUM 226 RADIUM ISOTOPES SPONTANEOUS FISSION RADIOISOTOPES TARGETS THORIUM 232 TARGET URANIUM 230 URANIUM 232 URANIUM ISOTOPES YEARS LIVING RADIOISOTOPES
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Zusammenfassung:	The nuclei {sup 230}U and {sup 232}U were populated in the compound nucleus reactions {sup 232}Th({alpha},6n) and {sup 232}Th({alpha},4n), respectively. Gamma rays from these nuclei were observed in coincidence with a recoil detector. A comprehensive set of in-band E2 transitions were observed in the lowest lying negative-parity band of {sup 232}U while one E2 transition was also observed for {sup 230}U. These allowed B(E1;I{sup -{yields}}I{sup +}-1)/B(E2;I{sup -{yields}}I{sup -}-2) ratios to be extracted and compared with systematics. The values are similar to those of their Th and Ra isotones. The possibility of a tetrahedral shape for the negative-parity U bands appears difficult to reconcile with the measured Q{sub 2} values for the isotone {sup 226}Ra.
ISSN:	0556-2813 1089-490X
DOI:	10.1103/PHYSREVC.82.041305