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arxiv: 0711.0101 · v1 · submitted 2007-11-01 · ⚛️ nucl-ex

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First access to beta half-lives approaching the r-process path near N=126

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classification ⚛️ nucl-ex
keywords datafirstfirst-forbiddenhalf-livesnucleir-processaccessapproach
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Heavy neutron-rich nuclei close to N=126 were produced by fragmentation of a 1 A GeV 208Pb beam at the FRS at GSI. The beta-decay half-lives of 8 nuclides have been determined. The comparison of the data with model calculations including an approach based on the self-consistent ground-state description and continuum QRPA considering the Gamow-Teller and first-forbidden decays provide a first indication on the importance of first-forbidden transitions around A=195. The measured data indicate that the matter flow in the r-process to heavier fissioning nuclei is faster than previously expected.

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