David N. Schramm (1945-97)
Article Abstract:
Astrophysicist David Schramm was a graduate student at Caltech, where he worked with William A. Fowler and Gerald Wasserburg. He began his career investigating the origin of the heaviest elements in the explosions of stars, but his most significant work involved the production of the lightest elements in the Big Bang. He was particularly interested in deuterium, and used it to deduce the mass density of baryons present in the Universe. He was as enthusiastic about life as a whole as he was about science.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Deuteronomy and numbers
Article Abstract:
Measurements of deuterium in high-redshift hydrogen clouds and of 3He in the local interstellar medium indicate that the 4He produced after the Big Bang constitute about 20% to 25% of all the elements by mass. The deuterium content gives important information about the nucleosynthesis and gives an estimate of baryon density. Nuclear reactions after the Big Bang caused the production of deuterium, 3He, 4He and 7Li.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Astrophysical 7Li as a product of Big Bang nucleosynthesis and galactic cosmic-ray spallation
Article Abstract:
Levels of the lithium (Li) isotope 7Li in a sampling of hot population II halo stars confirmed the astrophysical model which holds that both Big Bang nucleosynthesis and galactic cosmic ray (GCR) spallation create 7Li. Stellar concentrations of beryllium and boron isotopes likewise indicated that they were the joint products of GCR spallation and primordial, Big Bang-related processes.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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