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Present Status of AME and NUBASE Meng WANG CSNSM, Orsay, France IMP,Lanzhou,China April 6, 2011, Vienna
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List of AME and NUBASE A.H. Wapstra, Physica 21 (1955) 367 + 385; J.R. Huizenga, Physica 21 (1955) 410 F. Everling, L.A. König, J.H.E. Mattauch, A.H. Wapstra, Nucl. Phys. 18 (1960) 529 L.A. König, J.H.E. Mattauch, A.H. Wapstra, Nucl. Phys. 31 (1962) 18 J.H.E. Mattauch, W. Thiele, A.H. Wapstra, Nucl. Phys. A67 (1965) 1 + 32 + 73 A.H. Wapstra & K. Bos, At. Data Nucl. Data Tables 19 (1977) 175 A.H. Wapstra, G. Audi & R. Hoekstra, Nucl. Phys. A432 (1985) 185 G. Audi & A.H. Wapstra, Nucl. Phys. A 565 (1993) 66 C. Borcea, G. Audi, A.H. Wapstra & P. Favaron, Nucl. Phys. A 565 (1993) 158 G. Audi, A.H. Wapstra & M. Dedieu, Nucl. Phys. A 565 (1993) 193 G. Audi & A.H. Wapstra, Nucl. Phys. A 595 (1995) 409 G. Audi, O. Bersillon, J. Blachot & A.H. Wapstra, Nucl. Phys. A 624 (1997) 1 G. Audi, O. Bersillon, J. Blachot & A.H. Wapstra, Nucl. Phys. A 729 (2003) 3 A.H. Wapstra, G. Audi & C. Thibault, Nucl. Phys. A 729 (2003) 129 G. Audi, A.H. Wapstra & C. Thibault, Nucl. Phys. A 729 (2003) 337 Science 20 June 1958: 1431-1432.
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Coordinator CSNSM-Orsay : Georges Audi Contributors IMP-Lanzhou : Meng Wang, Xing Xu (Ame + programing) CSNSM-Orsay : Jean Blachot (Nubase), Xun Sun (program for Nubase) GSI-Darmstadt : Berndt Pfeiffer (Ame) ANL-Argone : Filip Kondev (Nubase + Ame) all labs welcome : 20% to 100% FTE two times one week at CSNSM-Orsay
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Horizontal Evaluation
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Mass measurement: inertial mass energy Relative Measurement
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The AME2003 A.H. Wapstra, G. Audi, C. Thibault, Nucl. Phys. A 729 (2003) 129
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The Atomic Mass Evaluation Experimental data Data Evaluation Treatment of Data – adjusted masses Least Squares Method Flow of Information Consistency of Data Regularity of the Mass Surface – estimated unknown masses From S2n - S2p - Qα -... From difference with a smooth function
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Example 1
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Example 2
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3597 NUCLEI ACCEPTED : degreecounts 1967 21647 3339 4178 5115 683 773 855 948 1034 1124 1217 1312 144 151 967 Primaries in 1554 Equations with 4005 Coefficients Statistics
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Consistency of Data: Example 1
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In AME2003, 168Yb-168Er = 1420(4) keV Example 2
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Correlations of output masses
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Peter J. Mohr,† Barry N. Taylor,‡ and David B. Newell REVIEWS OF MODERN PHYSICS, VOLUME 80, APRIL–JUNE 2008 CODATA recommended values of the fundamental physical constants: 2006* Correlations of input data 3H (*10 -10 )3He (*10 -10 ) statistical2.2452.394 relativistic11 Ion Number11 q/a7.7 contaminant11 others11 reference1.8 Relative uncertainties Sz. Nagy et al., Europhys. Lett. 74(3), 404-410. 3H3H 3 He 3H3H6.255.64 3 He0.8876.74
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Ame’2003 10762 experimental data 4943 used 2228 gs masses 203 isomers Ame’2010 12220 experimental data 5092 used 2341 gs masses 220 isomers Precision of Q-values and masses
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Change in the predicted abundances when keeping the same stellar parameters (neutron density n_n, temperature and process duration). The experimental masses from AME are superimposed on the FRDM mass model [1997Möller]: AME2003 masses (black line) and AME2010 (red line). Crosses and error bars are for the observed abundances in the solar system [2003Lodders]. The data are normalized to the A=130 observed abundance. Impact to astrophysics
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The Nubase evaluation of Nuclear and Decay Properties Ground state Isomeric states, > 100 ns Masses T 1/2 J π Decay modes and intensities
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146 Tm
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Discovery of Highly Excited Long-Lived Isomers in Neutron-Rich Hafnium and Tantalum Isotopes through Direct Mass Measurements Reed et al., PRL 105, 172501 (2010)
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Weighing excited nuclear states with a Penning trap mass spectrometer C. Weber et al., Phys. Lett. A 347 (2005) 81.
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155 160 165 170 175 Neutron number N Q value
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