Synthesis of a new element with atomic number Z = 117

The discovery of a new chemical element with atomic number Z=117 is reported. The isotopes (293)117 and (294)117 were produced in fusion reactions between (48)Ca and (249)Bk. Decay chains involving 11 new nuclei were identified by means of the Dubna gas-filled recoil separator. The measured decay pr...

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Veröffentlicht in:	Physical review letters 2010-04, Vol.104 (14), p.142502-142502, Article 142502
Hauptverfasser:	Oganessian, Yu Ts, Abdullin, F Sh, Bailey, P D, Benker, D E, Bennett, M E, Dmitriev, S N, Ezold, J G, Hamilton, J H, Henderson, R A, Itkis, M G, Lobanov, Yu V, Mezentsev, A N, Moody, K J, Nelson, S L, Polyakov, A N, Porter, C E, Ramayya, A V, Riley, F D, Roberto, J B, Ryabinin, M A, Rykaczewski, K P, Sagaidak, R N, Shaughnessy, D A, Shirokovsky, I V, Stoyer, M A, Subbotin, V G, Sudowe, R, Sukhov, A M, Tsyganov, Yu S, Utyonkov, V K, Voinov, A A, Vostokin, G K, Wilk, P A
Format:	Artikel
Sprache:	eng
Schlagworte:	ACTINIDE NUCLEI ALKALINE EARTH ISOTOPES ALPHA DECAY RADIOISOTOPES ATOMIC NUMBER BERKELIUM 249 BERKELIUM ISOTOPES BETA DECAY RADIOISOTOPES BETA-MINUS DECAY RADIOISOTOPES CALCIUM 48 CALCIUM ISOTOPES DAYS LIVING RADIOISOTOPES DECAY DUBNA EASTERN EUROPE ELEMENT 117 ELEMENTS EUROPE EVEN-EVEN NUCLEI HEAVY ION FUSION REACTIONS HEAVY ION REACTIONS HEAVY NUCLEI INTERMEDIATE MASS NUCLEI ISOTOPE PRODUCTION ISOTOPES NUCLEAR PHYSICS AND RADIATION PHYSICS NUCLEAR REACTIONS NUCLEI NUCLEOSYNTHESIS ODD-EVEN NUCLEI PARTICLE DECAY RADIOISOTOPES RUSSIAN FEDERATION SPONTANEOUS FISSION RADIOISOTOPES STABILITY STABLE ISOTOPES SYNTHESIS TRANSACTINIDE ELEMENTS TRANSPLUTONIUM ELEMENTS TRANSURANIUM ELEMENTS
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Zusammenfassung:	The discovery of a new chemical element with atomic number Z=117 is reported. The isotopes (293)117 and (294)117 were produced in fusion reactions between (48)Ca and (249)Bk. Decay chains involving 11 new nuclei were identified by means of the Dubna gas-filled recoil separator. The measured decay properties show a strong rise of stability for heavier isotopes with Z > or = 111, validating the concept of the long sought island of enhanced stability for superheavy nuclei.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.104.142502