ISSN:
1434-601X
Keywords:
23.60.+e
;
25.70.3f
;
25.85.Ca
;
27.9.+6
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We identified twoα-emitting isotopes of element 107 with masses of 261 and 262 respectively by parent-daughter correlations. For the isotope with mass 262 we found two transitions with (102±26) ms and (8.0±2.1) ms half-life, which we assign to the groundstate and to an isomeric transition, respectively. The half-life of the isotope with mass 261 is (11.8 −2.8 +5.3 ) ms. Spontaneous fission, which could be assigned to the decay of an isotope of element 107, was not detected in our experiments. This observation is in-line with our previous results, indicating a region of nuclei with strong microscopic stabilisation in the trans-actinides. Both new isotopes were produced by complete fusion of209Bi with54Cr. The production cross sections are (163±34) pb for262107 and (36 −14 +22 ) pb for261107.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01565147
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