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Tavares OAP, Terranova ML. Toward an accurate determination of half-life of 147Sm isotope. Appl Radiat Isot 2018; 139:26-33. [PMID: 29684715 DOI: 10.1016/j.apradiso.2018.04.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 01/23/2018] [Accepted: 04/02/2018] [Indexed: 11/29/2022]
Abstract
The task of an accurate determination of alpha-decay rate of 147Sm isotope, a topic of importance in both basic and applied science, has been performed in the present research following two different routes. First, a critical review and data analysis of the whole set of half-life values obtained till date yielded an average of 106.3 ± 0.5 Ga. Second, a one-parameter, semi-empirical model for alpha emission from nuclei, developed in the framework of quantum mechanical tunneling mechanism through a Coulomb-plus-centrifugal-plus-overlapping potential barrier, that yielded a value of 108.2 ± 3.0 Ga. The good agreement found between the half-life values obtained from these procedures represents a net progress toward the assessment of a reliable 147Sm alpha-decay rate to be used in geo- and cosmo-chronological investigations.
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Affiliation(s)
- Odilon A P Tavares
- Centro Brasileiro de Pesquisas Físicas-CBPF/MCTIC, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro, RJ, Brazil
| | - Maria Letizia Terranova
- Dipartimento di Scienze e Tecnologie Chimiche, Università degli Studi di Roma "Tor Vergata", via della Ricerca Scientífica s/n, 00133 Roma, Italy.
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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. A Shorter
146
Sm Half-Life Measured and Implications for
146
Sm-
142
Nd Chronology in the Solar System. Science 2012; 335:1614-7. [PMID: 22461609 DOI: 10.1126/science.1215510] [Citation(s) in RCA: 139] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The extinct p-process nuclide (146)Sm serves as an astrophysical and geochemical chronometer through measurements of isotopic anomalies of its α-decay daughter (142)Nd. Based on analyses of (146)Sm/(147)Sm α-activity and atom ratios, we determined the half-life of (146)Sm 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 (146)Sm abundance in the early solar system, ((146)Sm/(144)Sm)(0) = 0.0094 ± 0.0005 (2σ), than previously estimated. Terrestrial, lunar, and martian planetary silicate mantle differentiation events dated with (146)Sm-(142)Nd converge to a shorter time span and in general to earlier times, due to the combined effect of the new (146)Sm half-life and ((146)Sm/(144)Sm)(0) values.
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Affiliation(s)
- N. Kinoshita
- Research Facility Center for Science and Technology, University of Tsukuba, Japan
| | - M. Paul
- Racah Institute of Physics, Hebrew University, Jerusalem, Israel 91904
| | - Y. Kashiv
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - P. Collon
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - C. M. Deibel
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 46624, USA
| | - B. DiGiovine
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - J. P. Greene
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - D. J. Henderson
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - C. L. Jiang
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - S. T. Marley
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - T. Nakanishi
- Faculty of Chemistry, Institute of Science and Engineering, Kanazawa University, Japan
| | - R. C. Pardo
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - K. E. Rehm
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - D. Robertson
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - R. Scott
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - C. Schmitt
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - X. D. Tang
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - R. Vondrasek
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - A. Yokoyama
- Faculty of Chemistry, Institute of Science and Engineering, Kanazawa University, Japan
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Boudin A, Deutsch S. Geochronology: Recent Development in the Lutetium-176/Hafnium-176 Dating Method. Science 1970; 168:1219-20. [PMID: 17843592 DOI: 10.1126/science.168.3936.1219] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The application of the lutetium-176/ hafnium-176 method to gram quantities of minerals containing rare earths is made possible by the development of analytical and isotope dilution techniques for microgram amounts of lutetium and hafnium. The geological redetermination of the half-life of lutetium-176 (3.3 +/- 0.5 x 10(10) years) is in agreement with recent physical measurements.
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