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In; A Rosetta stone for decays of 
-process nucleiXu, Z. Y.*; Andreyev, A. N.; 47 of others*
Physical Review Letters, 131(2), p.022501_1 - 022501_6, 2023/07
Times Cited Count：4 Percentile：52.54(Physics, Multidisciplinary)
Fe and 
Pu deposited on Earth constrain the r-process yields of recent nearby supernovaeWallner, 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：66 Percentile：97.00(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 (Fe) (half-life, 2.6 million years), which is predominantly produced in massive stars and ejected in supernova explosions, and Pu (half-life, 80.6 million years), which is produced solely in r-process events. We detect two distinct influxes of Fe to Earth in the last 10 million years and accompanying lower quantities of Pu. The Pu/Fe influx ratios are similar for both events. The Pu influx is lower than expected if SNe dominate r-process nucleosynthesis, which implies some contribution from other sources.
Yokokawa, Mitsuo; Saito, Minoru*; Hagiwara, Takashi*; Isobe, Yoko*; Jinguji, Satoshi*
Nihon Keisan Kogakkai Rombunshu, 4, p.31 - 36, 2002/00
Earth simulator is a distributed memory parallel system which consists of 640 processor nodes connected by a full crossbar network. Each processor node is a shared memory system which is composed of eight vector processors. The total peak performance and main memory capacity are 40Tflops and 10TB, respectively. A performance prediction system GS
for the Earth Simulator has been developed to estimate sustained performance of programs. To validate accuracy of vector performance prediction by the GS, the processing times for three groups of kernel loops estimated by the GS are compared with the ones measured on SX-4. It is found that the absolute relative errors of the processing time are 0.89%,1.42% and 6.81% in average for three groups. The sustained performance of three groups on a processor of the Earth Simulator have been estimated by the GS and those performance are 5.94Gflops,3.76Gflops and 2.17Gflops in average.
Tsunematsu, Toshihide; Takeda, Tatsuoki; ; ; ;
JAERI-M 8616, 46 Pages, 1979/12
no abstracts in English
