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Journal Articles

$$^{60}$$Fe and $$^{244}$$Pu deposited on Earth constrain the r-process yields of recent nearby supernovae

Wallner, A.*; Froehlich, M. B.*; Hotchkis, M. A. C.*; Kinoshita, N.*; Paul, M.*; Martschini, M.*; Pavetich, S.*; Tims, S. G.*; Kivel, N.*; Schumann, D.*; et al.

Science, 372(6543), p.742 - 745, 2021/05

 Times Cited Count:31 Percentile:96.53(Multidisciplinary Sciences)

Half of the chemical elements heavier than iron are produced by the rapid neutron capture process (r-process). The sites and yields of this process are disputed, with candidates including some types of supernovae (SNe) and mergers of neutron stars. We search for two isotopic signatures in a sample of Pacific Ocean crust-iron-60 ($$^{60}$$Fe) (half-life, 2.6 million years), which is predominantly produced in massive stars and ejected in supernova explosions, and $$^{244}$$Pu (half-life, 80.6 million years), which is produced solely in r-process events. We detect two distinct influxes of $$^{60}$$Fe to Earth in the last 10 million years and accompanying lower quantities of $$^{244}$$Pu. The $$^{244}$$Pu/$$^{60}$$Fe influx ratios are similar for both events. The $$^{244}$$Pu influx is lower than expected if SNe dominate r-process nucleosynthesis, which implies some contribution from other sources.

Journal Articles

$$^{7}$$Be($$n, alpha)^{4}$$He reaction and the cosmological lithium problem; Measurement of the cross section in a wide energy range at n_TOF at CERN

Barbagallo, M.*; Musumarra, A.*; Cosentino, L.*; Maugeri, E.*; Heinitz, S.*; Mengoni, A.*; Dressler, R.*; Schumann, D.*; K$"a$ppeler, F.*; Harada, Hideo; et al.

Physical Review Letters, 117(15), p.152701_1 - 152701_7, 2016/10

 Times Cited Count:72 Percentile:94.68(Physics, Multidisciplinary)

Journal Articles

Fluoride complexation of rutherfordium (Rf, element 104)

Strub, E.*; Br$"u$chle, W.*; Eichler, R.*; G$"a$ggeler, H. W.*; Glatz, J. P.*; Grund, A.*; G$"a$rtner, M.*; J$"a$ger, E.*; Jost, D.*; Kirbach, U.*; et al.

1st International Conference on the Chemistry and Physics of the Transactinide Elements; Extended Abstracts, 4 Pages, 1999/00

no abstracts in English

Journal Articles

Chromatographic studies of rutherfordium (element 104) with tributylphosphate

Br$"u$chle, W.*; Eichler, B.*; G$"a$ggeler, H. W.*; Guenther, R.*; J$"a$ger, E.*; Jost, D.*; Kratz, J. V.*; Nagame, Yuichiro; Paulus, W.*; Pershina, V.*; et al.

Proceedings of 1st International Conference on the Chemistry and Physics of the Transactinide Elements, 3 Pages, 1999/00

no abstracts in English

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