Identification of four new neutron-rich rare-earth isotopes

Details Identification of four new neutron-rich rare-earth isotopes Identification of four new neutron-rich rare-earth isotopes

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phrvl..56.1547m&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 56, April 14, 1986, p. 1547-1550.

Astronomy and Astrophysics

Astrophysics

15

Isotopes, Neutrons, Nuclear Fusion, Radioactive Decay, Rare Earth Elements, Astrophysics, Fission Products, On-Line Systems, Spontaneous Fission, 150<=A<=189, Elementary Particle Processes, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

Four new neutron-rich fission-product nuclei were identified at the on-line mass separator TRISTAN at Brookhaven National Laboratory. These nuclei are of particular significance in astrophysical nucleosynthesis calculations, since they lie in the region of the rare-earth maximum in r-process abundances. Their half-lives were measured to be T1/2 = 28.2 + or - 1.1 sec for Pm-156, T1/2 = 15 + or - 2 sec for Sm-159, T1/2 = 8.7 + or - 1.4 sec for Sm-160, and T1/2 = 27 + or - 3 sec for Eu-161. It is noted that a comparison of these and other new half-lives with recent calculations reveals a characteristic pattern of discrepancies.

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