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Volumn 298, Issue 5601, 2002, Pages 2182-2185

Short-lived nuclides in hibonite grains from Murchison: Evidence for solar system evolution

Author keywords

[No Author keywords available]

Indexed keywords

ISOTOPES; KINETIC ENERGY; METEORITES; SOLAR SYSTEM;

EID: 0037073942     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1078322     Document Type: Article
Times cited : (90)

References (40)
  • 1
    • 0002903279 scopus 로고    scopus 로고
    • V. Mannings, S. S. Russell, A. P. Boss, Eds. (Univ. of Arizona Press, Tucson, AZ)
    • J. N. Goswami, H. A. T. Vanhala, in Protostars and Planets IV, V. Mannings, S. S. Russell, A. P. Boss, Eds. (Univ. of Arizona Press, Tucson, AZ, 2000), pp. 965-996.
    • (2000) Protostars and Planets IV , pp. 965-996
    • Goswami, J.N.1    Vanhala, H.A.T.2
  • 6
    • 2242447282 scopus 로고    scopus 로고
    • note
    • The light elements Li, Be, and B are readily destroyed in high-temperature nuclear burning in stellar interiors. They are considered to be products of interactions of energetic particles in interstellar space with ambient interstellar matter [see, e.g. (7)].
  • 10
    • 2242488441 scopus 로고    scopus 로고
    • note
    • It is possible to estimate the time between the ejection of short-lived radioactivities from a stellar source (such as a supernova or a thermally pulsing asymptotic giant branch star or a Wolf-Rayet star) and the formation of some of the early solar system objects in which their records are found by considering stellar nucleosynthesis yields and a suitable model for transport into and subsequent mixing of the radioactivities with the protosolar cloud [e.g. (1)]. If a homogeneous distribution of the short-lived nuclides in the solar nebula is assumed, they may be used as relative chronometers for dating solar system events and processes.
  • 14
    • 2242434620 scopus 로고    scopus 로고
    • note
    • standard) -1) × 1000%, where j represents the reference isotope. A suitable standard with normal isotopic composition is used to infer the magnitude of the anomaly.
  • 18
    • 2242426451 scopus 로고    scopus 로고
    • note
    • Samples were analyzed with a Cameca ims-4f ion microprobe at the Physical Research Laboratory, Ahmedabad. Techniques are described in supplemental data on Science Online.
  • 19
    • 2242481313 scopus 로고    scopus 로고
    • note
    • 11B = 0.2473) in them; no such assumption was made while analyzing the combined data set (Fig. 1).
  • 21
    • 2242458760 scopus 로고    scopus 로고
    • thesis, Devi Ahilya University, Indore, India
    • K. K. Marhas, thesis, Devi Ahilya University, Indore, India (2001).
    • (2001)
    • Marhas, K.K.1
  • 23
    • 2242459707 scopus 로고    scopus 로고
    • note
    • -5).
  • 25
    • 2242449051 scopus 로고    scopus 로고
    • note
    • 10Be, and therefore this possibility cannot be ruled out. However there is neither any rigorous published work nor any general consensus on this issue at present.
  • 27
    • 2242489314 scopus 로고    scopus 로고
    • note
    • -β (where n is the number and r is the radius of the targets), with β values of 3 to 5. We ignore possible shielding of the targets by nebular gas and assume free access of SEPs up to the asteroidal zone. Appropriate reaction cross sections for relevant reactions have been used in these calculations (38, 39).
  • 32
    • 2242441042 scopus 로고    scopus 로고
    • note
    • 26Al.
  • 35
    • 2242484863 scopus 로고    scopus 로고
    • note
    • 27Al ratios cannot be explained in this scenario.
  • 40
    • 2242447281 scopus 로고    scopus 로고
    • note
    • We thank E. Olsen for sample SH-7, R. S. Lewis for the acid-resistant residue of Murchison, and M. Chaussidon for the GB4 standard (18). Supported by the Department of Space, India (K.K.M., J.N.G.) and by NASA grant NAGS-9510 (A.M.D.).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.