Toward an accurate determination of half-life of $^{147}$Sm isotope

Odilon Tavares, Maria Terranova


The task of an accurate determination of alpha-decay rate of 147Sm isotope, a topic of importance for both basic and applied science, has been faced in the present research following two different routes. First, a critical review and data analysis of the whole set of half-life-values obtained up today that yielded a value of (106.3 ± 0.5) Ga. Second, a one-parameter, semi-empirical model for alpha emission from nuclei, developed in the framework of the 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 towards the assessment of a reliable 147Sm alpha-decay rate to be used in geo- and cosmo-chronological investigations.

Texto completo:



American Physical Society - A Report by the APS Panel on Public Affairs 2011 “Energy Critical Elements: Securing Materials for Emerging Technologies” (Washington, DC, USA)

European Commission - Report of the Ad-hoc Working Group on Defining Critical Raw Materials 2011: Communication from the Commission to the European Parliament , the Council, the European Economic and Social Committee and the Committee of the Regions on the 2017 list of Critical Raw Materials for the EU (COM/2017/0490 )

Japan Oil, Gas and Metals National Corporation: “Rare Metals Stockpiling”:

Lugmair G W 1974 Sm-Nd ages: a new dating method Meteoritics 9 369

Lugmair G W and Marti K 1978 Lunar initial 143Nd/144Nd: differential evolution of the lunar crust and mantle Earth Planet. Sci. Lett. 39 349

Hamilton P J, Evensen N M and O'Nions R K, Smith H S and Erlank A J 1979 Sm-Nd dating of Onverwacht Group Volcanics, Southern Africa Nature 279 298

Humphries F J and Cliff R A 1982 Sm-Nd dating and cooling history of Scourian granulites, Sutherland Nature 295 515

Chesley J T, Halliday A N and Scrivener R C 1991 Samarium-Neodymium direct dating of fluorite mineralization Science 252 949

Bros R, Stille P, Gauthier-Lafaye F, Weber F and Clauer N 1992 SmNd isotopic dating of Proterozoic clay material: An example from the Francevillian sedimentary series, Gabon Earth Planet. Sci. Lett. 113 207

Boyet M, Carlson R W and Horan M 2010 Old Sm-Nd ages for cumulate eucrites and redetermination of the solar system initial 146Sm/144Sm ratio Earth Planet. Sci. Lett. 291 172

Clayton R N 2007 Isotopes: From Earth to the Solar System. Ann. Rev. Earth Planet. Sci. 35 1

Clayton R N 2015 in Encyclopedia of Scientific Dating Methods Rink W J and Thompson J W (Eds.) Springer Science-Business (Dordrecht)

Fowler W A and Hoyle F 1960 Nuclear Cosmochronology Ann. Phys. 10 280

Symbalisty E M D and Schramm D N 1981 Nucleocosmochronology Rep. Prog. Phys. 44 293

Takahashi K 1998 The 187Re-187Os cosmochronometry – the latest developments AIP Conf. Proc. 425 616

Hiess J, Condon D J, McLean N and Noble S R 2012 238U/235U Systematics in Terrestrial Uranium-Bearing Minerals Sci. 335 1610

Wagner J K 1982 An overview of meteorite history as revealed by isotopic dating Astron. Quart. 4 179

Wilde S A, Valley J W, Peck W H and Graham C M 2001 Evidence from detrital zircons for the existence of continental crust and oceans on the Earth 4.4 Gyr Nature 409 175

A.N. Krot and M. Bizzarro 2009 Chronology of meteorites and the early solar system Geochim. Cosmochim. Acta 73 4919

Amelin Y, Kaltenbach A, Iizuka T, Stirling C H, Ireland T R, Petaev M and Jakobsen S B 2010 U–Pb chronology of the Solar System's oldest solids with variable 238U/235U Earth Planet. Sci. Lett. 300 343

Dauphas N and Chaussidon M 2011 A perspective from extinct radionuclides on a young stellar object: the Sun and its accretion disk Ann. Rev. Earth Planet. Sci. 39 351

Connelly J N, Bizzarro M, Krot A N, Nordlund A, Wielandt D and Ivanova M A 2012 The Absolute Chronology and Thermal Processing of Solids in the Solar Protoplanetary Disk Science 338 651

Amelin Y and Ireland T R 2013 Dating the oldest rocks and mineral in the solar system Elements 9 39

Frebel A, Christlieb N, Norris J E, Thom C, Beers T C and Rhee J 2007 Discovery of HE 1523-0901, a strongly r-process-enhanced metal-poor star with detected uranium Astrophys. J. 660 L117

Brennecka G A, Borg L E and Wadhwa M 2013 Evidence for supernova injection into the solar nebula and the decoupling of r-process nucleosynthesis Proc. Nat. Acad .Sci. (USA) 110 17241

Lawrence C R 2015, JPL (for the Planck Collaboration) Astrophysics Subcommittee, NASA HQ

Hidaka H and Yoneda S 2007 Sm and Gd isotopic shift of Apollo 16 and 17 drill stem samples and their implications for regolith history Geochem. Cosmochem. Acta 71 1074

Wasson J T 1985 Meteorites: their record of early solar-system history (Freeman W H and Co Ed., New York)

Davis A M 2005 Meteorites, Comets and Planets Treatise of Geochemistry vol 1 (Oxford, Elsevier-Pergamon)

Krot A N and Bizzarro M 2009 Contributions to the Workshop on Chronology of Meteorites and the Early Solar System (Kauai, Nov 5-7, 2007) Geochem. Cosmochim. Acta 73 (Suppl.) A1−A5

Hevesy G and Pahl M 1933 Range of radiation from Samarium Nature 131 434

Hevesy G, Pahl M and Hosemann R 1933 Die Radioaktivität des Samariums Z. Phys. 83 43

Curie M and Joliot F 1934 Sur la radioactivité du samarium Compt. Rend. Acad. Sci. (Paris) 198 360

Wilsenach H, Zuber K, Degering D, Heller R, and Neu V 2017 High precision half-life measurement of 147Sm α decay from thin-film sources Phys. Rev. C 95 034618

Libby W F 1934 Radioactivity of Neodymium and Samarium Phys. Rev. 46 196

Beard G and Wiedenbeck M L 1954 Natural radioactivity of Sm147 Phys. Rev. 95 1245

Mäder M 1934 Die Eigenschaften der Samarium-Strahlung Z. Physik 58 601

Lyford D 1934 The Radioactivity of Samarium Thesis The Johns Hopkins University

Herszfinkiel M and Wroncberg A 1934 Radioactivity of Samarium Compt. Rend. Acad. Sci. (Paris) 199 133

Hosemann R 1936 Die Radioaktivität des Samariums Z. Physik 99 405

Bethe H A 1937 Nuclear Physics B. Nuclear Dynamics, Theoretical Rev. Mod. Phys. 9 69 page 166

Lattes C M G, Samuel E G and Cuer P 1947 Radioactivity of Samarium: use of the photographic plate to determine low concentrations of radioactive materials An. Acad. Brasil. Cienc. 19 1

Picciotto E 1949 Étude de la radioactivité du Samarium par la méthode photographique Comp. Rend. Acad. Sci. (Paris) 229 117

Leslie G E 1954 Thesis, North Carolina State College AD-37749; 1956 Nucl. Sci. Abst. 10 134

Beard G B and Kelly W H 1958 The use of a samarium-loaded scintillator for the determination of the half-life of Sm147 Nucl. Phys. 8 207

Karras M and Nurmia M 1960 Natural radioactivity of Samarium and Neodymium Nature 185 601

Wright P M, Steinberg E P and Glendenin L E 1961 Half-life of Samarium-147 Phys. Rev. 123 205

MacFarlane R D and Kohman T P 1961 Natural alpha radioactivity in medium-heavy elements Phys. Rev. 121 1758

Graeffe G and Nurmia M 1961 The use of thick sources in alpha spectrometry Ann. Acad. Sci. Fenn. A 6 1-14

Donhoffer D 1964 Bestimmung der Halbwertszeiten der in der Natur Vorkommenden Radioaktiven Nuklide Sm147 und Lu176 Mittels Flüssiger szintillatoren Nucl. Phys. 50 489

Valli K, Aaltonen J, Graeffe G, Nurmia M and Pöyhönen R 1965 Half-life of Sm-147: comparison of ionization and liquid scintillation results Ann. Acad. Sci. Fenn. A 6 177

Gupta M C and MacFarlane R D 1970 The natural alpha radioactivity of Samarium J. inorg. nucl. Chem. 32 3425

Al Batania B and Janecke J 1987 Half-lives of long-lived alpha emitters Radiochim. Acta 42 159

Martins J B, Terranova M L and Correa M M 1992 Half-life for alpha-decay of 147Sm Nuovo Cimento 105A 1621

G W Lugmair and S J G Galer 1992 Age and isotopic relationships among the angrites Lewis Cliff 86010 and Angra dos Reis Geochim. Cosmochim. Acta 56 1673

Kinoshita N, Yokoyama A and Nakanishi T 2003 Half-life of Samarium-147 J. Nucl. Radiochem. Sci. 4 5

Kossert K, Jörg G, Nähle O and Gostomski C L 2009 High-precision measurement of the half-live of 147Sm Appl. Radiat. Isotopes 67 1702

Su J, Li Z H, Zhu L C, Lian G, Bai X X, Wang Y B, Guo B, Wang B X, Yan S Q, Zeng S, Li Y J, Li E T, Jin S J, Liu X, Fan Q W, Zhang J L, Jiang X Y, Lu J X, Lan X F, Tang X Z and Liu W P 2010 Alpha decay half-life of 147Sm in metal samarium and Sm2O3 Eur. Phys. J. A 46 69

Ruark A and Fussler K H 1935 On the half-lives of Potassium, Rubidium, Neodymium and Samarium Phys. Rev. 48 151

Holden N E 1990 Total half-lives for selected nuclides Pure & Appl. Chem. 62 941

Begemann F, Ludwig K R, Lugmair G W, Min K, Nyquist L E, Patchett P J, Renne P R, Shih C -Y, Villa I M and Walker R J 2001 Call for an improved set of decay constants for geochronological use Geochim. Cosmochim. Acta 65 111

Tavares O A P, Medeiros E L and Terranova M L 2005 Alpha decay half-life of bismuth isotopes J. Phys. G: Nucl. Part. Phys. 31 129

Chisté V and Bé M M 2011 147Pm. Comments on evaluation of decay data LNE-CEA/LNHB/V (Table 2: Experimental values of 147Sm half-life)

Snelling A 2015 Determination of the radioisotope decay constants and half-lives of Samarium-147 (147Sm) Answers Res. J. 8 305

Weaver B 1950 Mass assignment of natural activity of Samarium Phys. Rev. 80 301

Singh B et al 2013 Nuclear Data Sheets for A = 211 Nucl. Data Sheets 114 661

Wang M, Audi G, Kondev F G, Huang W J, Naimi S and Xu X 2017 The AME2016 atomic mass evaluation (II) Tables, graphs and references Chin. Phys. C 41 030003

Audi G, Kondev F G, Wang M, Huang W J and Naimi S 2017 The NUBASE2016 evaluation of nuclear properties Chin. Phys. C 41 030001

Tavares O A P, Terranova M L and Medeiros E L 2006 New evaluation of alpha decay half-life of 190Pt isotope for the Pt-Os dating system Nucl. Instrum. Methods Phys. Res. B 243 256

Medeiros E L, Rodrigues M M N, Duarte S B and Tavares O A P 2006 Systematics of alpha-decay half-life: new evaluations for alpha-emitter nuclides J. Phys. G: Nucl. Part. Phys. 32 B23

Tavares O A P and Medeiros E L 2011 Natural and artificial alpha radioactivity of Platinum isotopes Phys. Scr. 84 045202

Medeiros E L, Rodrigues M M N, Duarte S B and Tavares O A P 2007 Systematics of half-lives for proton radioactivity Eur. Phys. J. A 34 417

Tavares O A P and Medeiros E L 2010 Proton radioactivity: the case for 53mCo proton-emitter isomer Eur. Phys. J. A 45 57

Tavares O A P, Roberto L A M and Medeiros E L 2007 Radioactive decay by the emission of heavy nuclear fragments Phys. Scr. 76 375

Tavares O A P and Medeiros E L 2012 A simple description of cluster radioactivity Phys. Scr. 86 015201

Gamow G 1928 Zur Quantentheorie des Atomkernes Z. Phys. 51 204

Gurney R W and Condon E U 1928 Wave mechanics and radioactive disintegration Nature 122 439

Gurney R W and Condon E U 1929 Quantum mechanics of radioactive disintegration Phys. Rev. 33 127

Huang K-N, Aoyagi M, Chen M H, Crasemann B and Mark H 1976 Neutral-atom electron binding energies from relaxed-orbital relativistic Hartree-Fock-Slater calculations 2 ≤ Z 106 At. Data Nucl. Data Tables 18 243

Möller P, Nix J R, Myers W D and Swiatecki W J 1995 Nuclear ground-state masses and deformations At. Data Nucl. Data Tables 59 185

Sick I, McCarthy J S and Whitney R R 1976 Charge density of 4He Phys. Lett. B 64 33


  • Não há apontamentos.