konstkir
Да нет у Вас обоснования цифры 12000 как времени полета частиц.
Трудно четкую и обоснованную арифметику привести?
Теперь понял, о чем Вы спрашиваете - почему пылевое облако достигло Земли через 2,5 тысячи лет после взрыва сверхновой.
Арифметика тут простая. Еще Шкловский писал, что скорость в 1 км/с почти точно соответствует "пройденному" расстоянию в 1 пасрек за миллион лет. Расстояние до Алголя 28,5 пс делим на скорость 12000 км/с - получаем 0,002375 млн. лет или 2,375 тыс. лет. Поскольку взрыв произошел 15 тыс. лет тому назад, то Земли такое пылевое облако достигло примерно 12,6 тысяч лет тому назад. Можете конечно перевести расстояние до Алголя в км, потом время в года, но это такая морока, а результат практически тот же самый.
CADET
Отчего же, неосведомлённость? Мы тоже читали "Цикл космических катастроф" указанных авторов, книжку, которая уже давно вас вдохновляет. Там, правда, и срок катастрофы назван в 41 000 лет тому назад, но вы скорректировали так, как вам удобнее - 12 тысяч, не беда!
Richard Firestone, a nuclear scientist at the Department of Energy's Lawrence Berkeley National Laboratory, thinks that the Clovis era may literally have ended with a bang – a supernova, a star that exploded somewhere in the galactic neighborhood 41,000 years ago and unleashed a rain of cosmic debris that reached the earth about 13,000 years ago.
Еще вопросы есть?
Не знаю, какие они учёные эти авторы, но при упоминании движения в атмосфере Земли неких железных частиц со скоростью в 10 000 км/сек и прочий текст начинает вызывать некоторые сомнения.
Не надо ля-ля:
RICHARD B. FIRESTONE
Lawrence Berkeley National Laboratory
Nuclear Science Division
Isotopes Project
Berkeley, CA 94720
Phone: (510)486-7646 Fax: (510)486-5757
E-mail: RBF@LBL.gov
EDUCATION
1974 Ph.D. Chemistry, Michigan State University, East Lansing, MI
1967 B.S. Chemistry, The University of Michigan, Ann Arbor, MI
EMPLOYMENT HISTORY
1979 Staff Scientist, Nuclear Science Division, Lawrence Berkeley Laboratory
1978 Assistant Professor, Department of Chemistry, Michigan State University
1974 Post doc Michigan State University, Cyclotron Laboratory
1969 Graduate Student Research Assistant, MSU Cyclotron Laboratory
1967 Graduate Student Assistant, MSU Department of Chemistry
1966 Research assistant University of Michigan Schoolof Public Health
1964 Summer research assistant NALCO Chemical Company
1961 Apprentice meatcutter, High-Low Foods, Chicago
CURRENT RESEARCH ACTIVITIES
Prompt and Delayed Gamma-Ray Activation Analysis (PGAA/NAA)
Deep-Sea thermal vent Analysis
Photochromic materials analysis
Analysis of archaeological artifacts
Nondestructive, in situ, Elemental Analysis of Legacy Waste
Application of PGAA/NAA with a Neutron Generator
Internet Publishing
Isotope Explorer Software
Table of Isotopes Educational Home Page
Nuclear Astrophysics Home Page
WWW Table of Radioactive Isotopes
Paleo-Astronomy and Archaeology Research
Search for prehistoric supernovae
Search for isotope abundance anomalies in Paleo-Indian artifacts
Nuclear Data and Databases
8th edition of the Table of Isotopes (Wiley, 1996, 1998, 1999)
Table of Radioactive Isotopes (Wiley, 1986)
IAEA Coordinated Research Project a for PGAA database
Nuclear Data Sheets evaluation
Table of Superdeformed Nuclear Bands and Fission Isomers
Databases: Science's Neglected Legacy
SELECTED PUBLICATIONS
Over 200 publications in over 30 journals and books; list available here.
R.B. Firestone, V.S. Shirley, C.M. Baglin, S.Y.F. Chu, and J. Zipkin, Table of Isotopes, 8th Edition, John Wiley & Sons, Inc., New York (1996, 1998, 1999); with CD-ROM.
D.L. Perry, R.B. Firestone, G.L. Molnar, Zs. Revay, Zs. Kasztovszky, R.C. Gatti, and P. Wilde, Neutron-Induced Prompt Gamma Activation Analysis (PGAA) of Metals and Non-metals in Ocean Floor Geothermal Vent-generated Samples, J. Anal. At. Spectrom. 16, 1-7 (2001).
S.M. Mauer, R.B. Firestone, and C.R. Scriver, Databases: Science's Neglected Legacy, Nature 405, 116 (2000).
R.B. Firestone Nuclear Data Sheets for A=267-293, Nuclear Data Sheets 90, 391 (2000).
E. Browne, R.B. Firestone, and V.S. Shirley, Table of Radioactive Isotopes, John Wiley & Sons, Inc., New York (1986).
R.B. Firestone, R.C. Pardo, R.A. Warner, Wm. C. McHarris, and W.H. Kelly, The EC/B+ Decay of 145Gd: Resolution of EC/B+ Anomalies and Evidence for Pronounced Structures in the B-decay Strength, Phys. Rev. C25, 527 (1982).
R.B. Firestone, Complex Beta-Decay Schemes: Pandemonium Lost and Paradise Regained, Phys. Lett. 113B, 129 (1982).
M.K. Firestone, R.B. Firestone, J.M. Tiedje, Nitrous Oxide from Soil Denitrification: Factors Controlling its Biological Production, Science 208, 749 (1980).
R.B. Firestone, Wm. C. McHarris, and B.R. Holstein, Interpretation of the Anomalous EC/B+ Ratio in 22Na, Phys. Rev. C18, 2719 (1978).
R.B. Firestone, Nuclear Data Sheets for A=183, Nucl. Data Sheets 65, 589 (1992).
R.B. Firestone, J. Gilat, J.M. Nitschke, P.A. Wilmarth, and K.S. Vierinen, Decay Studies of Neutron-Deficient Nuclei near the Z=64 Subshell: 142Dy, 140,142Tb, 140,142Eu, 142Sm, and 142Pm, Phys. Rev. C43, 1066 (1991).
B. Singh, R.B. Firestone, and S.Y.F. Chu, Table of Superdeformed Nuclear Bands and Fission Isomers, Second Edition, Nucl. Data Sheets 78,1 (1996).
Recent Invited Talks
Nuclear Astrophysics Data on the Internet, Nuclei in the Cosmos V, July 9, 1998, Volos, Greece.
Was the Wooly Mammoth a Victim of Cosmic Events?, Institute for Nuclear and Particle Astrophysics Seminar, December 10, 1999, Lawrence Berkeley National Laboratory.
The Nuclear Science Databases: 60 Years of Community Service keynote address presented at the Human Genome Organization Mutation Database Meeting, Vancouver CA, April 9, 2000.
Prompt Neutron Activation Analysis (PGAA): Nondestructive, Simultaneous, In Situ, Quantitative, Complete Isotopic/Elemental Analysis of Almost Anything, Institute for Nuclear and Particle Astrophysics Seminar, November 17, 2000, Lawrence Berkeley National Laboratory.
Did a Supernova in Paleo-Indian Times Reset the Radiocarbon Clock?, YnK Conservation: Time, the Overlooked Dimension Wildlife & Conservation Biology Seminar, March 2, 2001, University of California, Berkeley.
Application of Prompt Gamma-Ray Activation Analysis (PGAA) with a Portable Neutron Source,August 28, 2001, Lawrence Livermore National Laboratory.
Prehistoric Supernovae, Nuclear Physics Forum, October 25, 2001, Lawrence Berkeley National Laboratory.
Cosmic Consequences for Radiocarbon Dating, Archaeological Research Faculty Lecture, Archeometry Network 2001-02 Series, October 29, 2001, University of California, Berkeley.
Awards and Societies
Member American Physical Society 1965-Present
Member Sigma Xi 1977-Present
LBNL Outstanding Performance Award 1998
Public Service
Member of El Cerrito High School II/USP Leadership Team
El Cerrito Soccer Club coach
Kensington School Science Fair judge
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