Abstract
Alpha decay and spontaneous fission of the ground-state and the isomeric state of ^{247}Md were investigated with specific emphasis to identify the ground-state of the daughter nucleus ^{243}Es. The decay studies were accompanied by measuring alpha -gamma coincidences. On the basis of the measured data an improved decay scheme of ^{247}Md is proposed. Spontaneous fission half-lives of ^{247g}Md and ^{247m}Md were determined and the fission hindrance of the high spin ground-state (7/2^{-}) relative to the low spin isomeric state (1/2^{-}) was estimated.
Highlights
Superheavy nuclei owe their stability against spontaneous fission due to shell effects [1]
As the unpaired nucleon essentially acts as a spectator when a pair of protons or neutrons is added to the nucleus, at low excitation energies odd-mass evenZ nuclei exhibit a similar structure along the isotone lines (N = const.), while odd-mass odd-Z nuclei exhibit a similar structure along the isotope lines (Z = const.)
As the γ events are observed in prompt coincidence with α decays, the lifetime of the level must be
Summary
Superheavy nuclei owe their stability against spontaneous fission due to shell effects [1]. Evaluation of their shell structure is decisive for understanding their existence, and provides a stringent test for theoretical models describing nuclear properties. One strategy to do so is to investigate systematic trends in single-particle levels (‘Nilsson levels’) in deformed nuclei. S activity similar to that of other investigated odd-mass mendelevium isotopes the latter was assigned as to the ground-state with 7/2−[514] configuration [5,9], while the 0.23-s activity was assigned to an isomeric state of 1/2−[521]. To obtain more information about the decay of this level was another motivation for the present study
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