TY - JOUR
T1 - 60Fe and 244Pu deposited on Earth constrain the r-process yields of recent nearby supernovae
AU - Wallner, A.
AU - Froehlich, M. B.
AU - Hotchkis, M. A.C.
AU - Kinoshita, N.
AU - Paul, M.
AU - Martschini, M.
AU - Pavetich, S.
AU - Tims, S. G.
AU - Kivel, N.
AU - Schumann, D.
AU - Honda, M.
AU - Matsuzaki, H.
AU - Yamagata, T.
N1 - Publisher Copyright:
© 2021 American Association for the Advancement of Science. All rights reserved.
PY - 2021/5/14
Y1 - 2021/5/14
N2 - 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 (60Fe) (half-life, 2.6 million years), which is predominantly produced in massive stars and ejected in supernova explosions, and plutonium-244 (244Pu) (half-life, 80.6 million years), which is produced solely in r-process events. We detect two distinct influxes of 60Fe to Earth in the last 10 million years and accompanying lower quantities of 244Pu. The 244Pu/60Fe influx ratios are similar for both events. The 244Pu influx is lower than expected if SNe dominate r-process nucleosynthesis, which implies some contribution from other sources.
AB - 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 (60Fe) (half-life, 2.6 million years), which is predominantly produced in massive stars and ejected in supernova explosions, and plutonium-244 (244Pu) (half-life, 80.6 million years), which is produced solely in r-process events. We detect two distinct influxes of 60Fe to Earth in the last 10 million years and accompanying lower quantities of 244Pu. The 244Pu/60Fe influx ratios are similar for both events. The 244Pu influx is lower than expected if SNe dominate r-process nucleosynthesis, which implies some contribution from other sources.
UR - http://www.scopus.com/inward/record.url?scp=85105800387&partnerID=8YFLogxK
U2 - 10.1126/science.aax3972
DO - 10.1126/science.aax3972
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C2 - 33986180
AN - SCOPUS:85105800387
SN - 0036-8075
VL - 372
SP - 742
EP - 745
JO - Science
JF - Science
IS - 6543
ER -