New superheavy element isotopes: ²⁴²Pu(⁴⁸Ca,5n) ²⁸⁵114

New superheavy element isotopes: ²⁴²Pu(⁴⁸Ca,5n) ²⁸⁵114

The new, neutron-deficient, superheavy element isotope ²⁸⁵114 was produced in ⁴⁸Ca irradiations of ²⁴²Pu targets at a center-of-target beam energy of 256 MeV (E*=50  MeV). The α decay of ²⁸⁵114was followed by the sequential α decay of four daughter nuclides, 281Cn, 277Ds, 273Hs, and 269Sg. 265Rf was...

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Veröffentlicht in:Physical review letters 2010-10, Vol.105 (18), p.182701-182701
Hauptverfasser: Ellison, P A, Gregorich, K E, Berryman, J S, Bleuel, D L, Clark, R M, Dragojević, I, Dvorak, J, Fallon, P, Fineman-Sotomayor, C, Gates, J M, Gothe, O R, Lee, I Y, Loveland, W D, McLaughlin, J P, Paschalis, S, Petri, M, Qian, J, Stavsetra, L, Wiedeking, M, Nitsche, H
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Sprache:eng
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Zusammenfassung:The new, neutron-deficient, superheavy element isotope ²⁸⁵114 was produced in ⁴⁸Ca irradiations of ²⁴²Pu targets at a center-of-target beam energy of 256 MeV (E*=50  MeV). The α decay of ²⁸⁵114was followed by the sequential α decay of four daughter nuclides, 281Cn, 277Ds, 273Hs, and 269Sg. 265Rf was observed to decay by spontaneous fission. The measured α-decay Q values were compared with those from a macroscopic-microscopic nuclear mass model to give insight into superheavy element shell effects. The²⁴²Pu (⁴⁸Ca,5n²)²⁸⁵114 cross section was 0.6(-0.5)+0.9  pb.
ISSN:1079-7114