A shorter 146Sm half-life measured and implications for 146Sm-142Nd chronology in the solar system

N. Kinoshita; M. Paul; Y. Kashiv; P. Collon; C. M. Deibel; B. DiGiovine; J. P. Greene; D. J. Henderson; C. L. Jiang; S. T. Marley; T. Nakanishi; R. C. Pardo; K. E. Rehm; D. Robertson; R. Scott; C. Schmitt; X. D. Tang; R. Vondrasek; A. Yokoyama

doi:10.1126/science.1215510

A shorter ¹⁴⁶Sm half-life measured and implications for ¹⁴⁶Sm-¹⁴²Nd chronology in the solar system

N. Kinoshita, M. Paul^*, Y. Kashiv, P. Collon, C. M. Deibel, B. DiGiovine, J. P. Greene, D. J. Henderson, C. L. Jiang, S. T. Marley, T. Nakanishi, R. C. Pardo, K. E. Rehm, D. Robertson, R. Scott, C. Schmitt, X. D. Tang, R. Vondrasek, A. Yokoyama

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

159 Scopus citations

Abstract

The extinct p-process nuclide ¹⁴⁶Sm serves as an astrophysical and geochemical chronometer through measurements of isotopic anomalies of its α-decay daughter ¹⁴²Nd. Based on analyses of ¹⁴⁶Sm/¹⁴⁷Sm α-activity and atom ratios, we determined the half-life of ¹⁴⁶Sm to be 68 ± 7 (1σ) million years, which is shorter than the currently used value of 103 ± 5 million years. This half-life value implies a higher initial ¹⁴⁶Sm abundance in the early solar system, (¹⁴⁶Sm/¹⁴⁴Sm)0 = 0.0094 ± 0.0005 (2σ), than previously estimated. Terrestrial, lunar, and martian planetary silicate mantle differentiation events dated with ¹⁴⁶Sm-¹⁴²Nd converge to a shorter time span and in general to earlier times, due to the combined effect of the new ¹⁴⁶Sm half-life and (¹⁴⁶Sm/¹⁴⁴Sm)₀ values.

Original language	English
Pages (from-to)	1614-1617
Number of pages	4
Journal	Science
Volume	335
Issue number	6076
DOIs	https://doi.org/10.1126/science.1215510
State	Published - 30 Mar 2012

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Kinoshita, N., Paul, M., Kashiv, Y., Collon, P., Deibel, C. M., DiGiovine, B., Greene, J. P., Henderson, D. J., Jiang, C. L., Marley, S. T., Nakanishi, T., Pardo, R. C., Rehm, K. E., Robertson, D., Scott, R., Schmitt, C., Tang, X. D., Vondrasek, R., & Yokoyama, A. (2012). A shorter ¹⁴⁶Sm half-life measured and implications for ¹⁴⁶Sm-¹⁴²Nd chronology in the solar system. Science, 335(6076), 1614-1617. https://doi.org/10.1126/science.1215510

@article{91b1bccf39bb4d139e719b1c2a4db58d,

title = "A shorter 146Sm half-life measured and implications for 146Sm-142Nd chronology in the solar system",

abstract = "The extinct p-process nuclide 146Sm serves as an astrophysical and geochemical chronometer through measurements of isotopic anomalies of its α-decay daughter 142Nd. Based on analyses of 146Sm/147Sm α-activity and atom ratios, we determined the half-life of 146Sm to be 68 ± 7 (1σ) million years, which is shorter than the currently used value of 103 ± 5 million years. This half-life value implies a higher initial 146Sm abundance in the early solar system, (146Sm/144Sm)0 = 0.0094 ± 0.0005 (2σ), than previously estimated. Terrestrial, lunar, and martian planetary silicate mantle differentiation events dated with 146Sm-142Nd converge to a shorter time span and in general to earlier times, due to the combined effect of the new 146Sm half-life and (146Sm/144Sm)0 values.",

author = "N. Kinoshita and M. Paul and Y. Kashiv and P. Collon and Deibel, {C. M.} and B. DiGiovine and Greene, {J. P.} and Henderson, {D. J.} and Jiang, {C. L.} and Marley, {S. T.} and T. Nakanishi and Pardo, {R. C.} and Rehm, {K. E.} and D. Robertson and R. Scott and C. Schmitt and Tang, {X. D.} and R. Vondrasek and A. Yokoyama",

year = "2012",

month = mar,

day = "30",

doi = "10.1126/science.1215510",

language = "אנגלית",

volume = "335",

pages = "1614--1617",

journal = "Science",

issn = "0036-8075",

publisher = "American Association for the Advancement of Science",

number = "6076",

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Kinoshita, N, Paul, M, Kashiv, Y, Collon, P, Deibel, CM, DiGiovine, B, Greene, JP, Henderson, DJ, Jiang, CL, Marley, ST, Nakanishi, T, Pardo, RC, Rehm, KE, Robertson, D, Scott, R, Schmitt, C, Tang, XD, Vondrasek, R & Yokoyama, A 2012, 'A shorter ¹⁴⁶Sm half-life measured and implications for ¹⁴⁶Sm-¹⁴²Nd chronology in the solar system', Science, vol. 335, no. 6076, pp. 1614-1617. https://doi.org/10.1126/science.1215510

TY - JOUR

T1 - A shorter 146Sm half-life measured and implications for 146Sm-142Nd chronology in the solar system

AU - Kinoshita, N.

AU - Paul, M.

AU - Kashiv, Y.

AU - Collon, P.

AU - Deibel, C. M.

AU - DiGiovine, B.

AU - Greene, J. P.

AU - Henderson, D. J.

AU - Jiang, C. L.

AU - Marley, S. T.

AU - Nakanishi, T.

AU - Pardo, R. C.

AU - Rehm, K. E.

AU - Robertson, D.

AU - Scott, R.

AU - Schmitt, C.

AU - Tang, X. D.

AU - Vondrasek, R.

AU - Yokoyama, A.

PY - 2012/3/30

Y1 - 2012/3/30

N2 - The extinct p-process nuclide 146Sm serves as an astrophysical and geochemical chronometer through measurements of isotopic anomalies of its α-decay daughter 142Nd. Based on analyses of 146Sm/147Sm α-activity and atom ratios, we determined the half-life of 146Sm to be 68 ± 7 (1σ) million years, which is shorter than the currently used value of 103 ± 5 million years. This half-life value implies a higher initial 146Sm abundance in the early solar system, (146Sm/144Sm)0 = 0.0094 ± 0.0005 (2σ), than previously estimated. Terrestrial, lunar, and martian planetary silicate mantle differentiation events dated with 146Sm-142Nd converge to a shorter time span and in general to earlier times, due to the combined effect of the new 146Sm half-life and (146Sm/144Sm)0 values.

AB - The extinct p-process nuclide 146Sm serves as an astrophysical and geochemical chronometer through measurements of isotopic anomalies of its α-decay daughter 142Nd. Based on analyses of 146Sm/147Sm α-activity and atom ratios, we determined the half-life of 146Sm to be 68 ± 7 (1σ) million years, which is shorter than the currently used value of 103 ± 5 million years. This half-life value implies a higher initial 146Sm abundance in the early solar system, (146Sm/144Sm)0 = 0.0094 ± 0.0005 (2σ), than previously estimated. Terrestrial, lunar, and martian planetary silicate mantle differentiation events dated with 146Sm-142Nd converge to a shorter time span and in general to earlier times, due to the combined effect of the new 146Sm half-life and (146Sm/144Sm)0 values.

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VL - 335

SP - 1614

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JO - Science

JF - Science

IS - 6076

ER -

A shorter ¹⁴⁶Sm half-life measured and implications for ¹⁴⁶Sm-¹⁴²Nd chronology in the solar system

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