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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Editor-in-Chief: Qaim, Syed M.

12 Issues per year

IMPACT FACTOR 2017: 1.202

CiteScore 2017: 1.22

SCImago Journal Rank (SJR) 2017: 0.409
Source Normalized Impact per Paper (SNIP) 2017: 0.869

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Volume 96, Issue 8


Search for the “missing” α-decay branch in 239Cm

Zhi Qin / W. Brüchle / D. Ackermann / Klaus Eberhardt / F. P. Heßberger / E. Jäger / Jens Volker Kratz / P. Kuusiniemi / D. Liebe / G. Münzenberg / Dalia Nayak / Yu. N. Novikov / M. Schädel / B. Schausten / E. Schimpf / A. Semchenkov / B. Sulignano / P. Thörle / X.L. Wu
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/ract.2008.1517


A search for the α-decay of 239Cm was carried out via the fusion reaction 232Th(12C,5n) 239Cm at GSI, applying nuclear chemistry techniques. The 239Cm α-decay would provide a link between known nuclear masses and α-decay energies measured in the region of the superheavy elements. Three different 12C beam energies were chosen in the present experiments. The α peaks of 238,240Cm were observed clearly at a 12C energy of 74 MeV, while 238Cm disappeared at 70 MeV to provide an undisturbed α-spectrum for a sensitive search of 239Cm decay. No α-events between 6.34 and 6.50 MeV, which could be assigned to 239Cm with confidence, were observed in this experiment. The upper limit of the α-branch of 239Cm was less than 1.0×10−5.

Keywords: Cm-239; α-decay; Nuclear mass; Actinide separation; 232Th(12C, xn)244–xCm

About the article

Received: 2007-11-27

Revised: 2008-03-25

Published Online: 2009-09-25

Published in Print: 2008-08-01

Citation Information: Radiochimica Acta, Volume 96, Issue 8, Pages 455–460, ISSN (Online) 2193-3405, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1524/ract.2008.1517.

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