Alpha-gamma decay studies of 253No and its daughter products 253Md, 249Fm
Alpha-gamma decay studies of 253No and its daughter products 253Md, 249Fm
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253No及其子产物253Md、249Fm的α-γ衰变研究
DOI：
10.1140/epja/i2012-12075-8
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
F. Hessberger et al.,
中科院分区：
文献类型：
--
作者：
石本毅;森正樹;Y. Fujita;M. Koshino and T. Ando;F. Hessberger et al.,
Nuclear structure and decay of the isotope {sup 253}No and its decay products {sup 249}Fm and {sup 253}Md were investigated by means of {alpha} - {gamma} spectroscopy. Besides the established strong {gamma} transitions from the 9/2{sup -}[734] Nilsson level in {sup 249}Fm, populated predominantly by the {alpha} decay of {sup 253}No, into the ground-state (gs) rotational band, a couple of weaker {gamma} lines (58.3, 129.2, 209.3 and 669.5keV) were observed and placed into the {sup 249}Fm level scheme. The transition from the 7/2{sup -} level in {sup 249}Es, populated by the {alpha} decay of {sup 253}Md, into the 9/2{sup +} member of the gs rotational band, so far established for other odd-mass Es isotopes, was observed clearly. GEANT4 simulations were performed to investigate the influence of energy summing between {alpha} particles and conversion electrons (CE) on the shape of the {alpha} spectra at different implantation energies, leading to evidence for a weak {alpha} decay branch of {sup 253}No into the gs of {sup 249}Fm or the ground-state rotational band, respectively. (orig.)
Nuclear structure and decay of the isotope {sup 253}No and its decay products {sup 249}Fm and {sup 253}Md were investigated by means of {alpha} - {gamma} spectroscopy. Besides the established strong {gamma} transitions from the 9/2{sup -}[734] Nilsson level in {sup 249}Fm, populated predominantly by the {alpha} decay of {sup 253}No, into the ground-state (gs) rotational band, a couple of weaker {gamma} lines (58.3, 129.2, 209.3 and 669.5keV) were observed and placed into the {sup 249}Fm level scheme. The transition from the 7/2{sup -} level in {sup 249}Es, populated by the {alpha} decay of {sup 253}Md, into the 9/2{sup +} member of the gs rotational band, so far established for other odd-mass Es isotopes, was observed clearly. GEANT4 simulations were performed to investigate the influence of energy summing between {alpha} particles and conversion electrons (CE) on the shape of the {alpha} spectra at different implantation energies, leading to evidence for a weak {alpha} decay branch of {sup 253}No into the gs of {sup 249}Fm or the ground-state rotational band, respectively. (orig.)