Lev3: POSITRON ANNIHILATION//POSITRONIUM//MAEAM - Statistics for Countries

Statistics per Country

Number of publications, full counts
Obs Country 1990-1994 1995-1999 2000-2004 2005-2009 2010-2014 All years
1 All countries 174 246 420 557 592 1989
2 United States 88 108 181 226 203 806
3 Japan 19 21 54 93 103 290
4 China 8 5 28 86 151 278
5 France 9 35 78 83 73 278
6 United Kingdom 13 29 50 49 58 199
7 Germany 16 26 42 36 54 174
8 Sweden 7 25 30 41 29 132
9 Russian Federation 4 20 26 37 44 131
10 India 6 10 13 26 13 68
11 Switzerland 1 4 6 12 9 32
12 Spain . . 6 16 9 31
13 Italy . 2 7 10 7 26
14 Canada 1 5 6 3 4 19
15 Hungary . . 1 9 3 13
16 Netherlands 4 1 1 2 5 13
17 Israel . 2 2 6 2 12
18 Taiwan 2 3 2 1 3 11
19 Belgium . . 1 3 5 9
20 Korea, Republic of 1 2 . 2 4 9
21 Austria . 2 2 2 2 8
22 Ukraine . 1 4 2 1 8
23 Argentina . 2 2 1 2 7
24 Chile . . . 5 2 7
25 Denmark 2 2 1 1 . 6
26 Poland . . 3 2 1 6
27 USSR 6 . . . . 6
28 Australia 2 . . 1 2 5
29 Oman . . . 1 3 4
30 South Africa . . 1 . 3 4
31 Venezuela . . 1 3 . 4
32 Viet Nam . . . . 4 4
33 Brazil . 1 . 2 . 3
34 New Zealand . . . 1 1 2
35 Nigeria . . . 2 . 2
36 Colombia . . . . 1 1
37 Czech Republic . . . 1 . 1
38 Estonia . . . 1 . 1
39 Iceland . . 1 . . 1
40 Iran, Islamic Republic of . . . . 1 1
41 Niger . . . 1 . 1
42 Norway . . 1 . . 1
43 Portugal . . 1 . . 1
44 Slovak Republic . . . . 1 1
45 Slovenia . . . . 1 1
46 Sudan . . . . 1 1
47 Thailand . . 1 . . 1

Number of publications, full counts


Bar chart of publication_year

Share of the total number of publications in the field, full counts (%)
Obs Country 1990-1994 1995-1999 2000-2004 2005-2009 2010-2014 All years
1 All countries 100.0 100.0 100.0 100.0 100.0 100.0
2 United States 50.6 43.9 43.1 40.6 34.3 40.5
3 Japan 10.9 8.5 12.9 16.7 17.4 14.6
4 China 4.6 2.0 6.7 15.4 25.5 14.0
5 France 5.2 14.2 18.6 14.9 12.3 14.0
6 United Kingdom 7.5 11.8 11.9 8.8 9.8 10.0
7 Germany 9.2 10.6 10.0 6.5 9.1 8.7
8 Sweden 4.0 10.2 7.1 7.4 4.9 6.6
9 Russian Federation 2.3 8.1 6.2 6.6 7.4 6.6
10 India 3.4 4.1 3.1 4.7 2.2 3.4
11 Switzerland 0.6 1.6 1.4 2.2 1.5 1.6
12 Spain . . 1.4 2.9 1.5 1.6
13 Italy . 0.8 1.7 1.8 1.2 1.3
14 Canada 0.6 2.0 1.4 0.5 0.7 1.0
15 Hungary . . 0.2 1.6 0.5 0.7
16 Netherlands 2.3 0.4 0.2 0.4 0.8 0.7
17 Israel . 0.8 0.5 1.1 0.3 0.6
18 Taiwan 1.1 1.2 0.5 0.2 0.5 0.6
19 Belgium . . 0.2 0.5 0.8 0.5
20 Korea, Republic of 0.6 0.8 . 0.4 0.7 0.5
21 Austria . 0.8 0.5 0.4 0.3 0.4
22 Ukraine . 0.4 1.0 0.4 0.2 0.4
23 Argentina . 0.8 0.5 0.2 0.3 0.4
24 Chile . . . 0.9 0.3 0.4
25 Denmark 1.1 0.8 0.2 0.2 . 0.3
26 Poland . . 0.7 0.4 0.2 0.3
27 USSR 3.4 . . . . 0.3
28 Australia 1.1 . . 0.2 0.3 0.3
29 Oman . . . 0.2 0.5 0.2
30 South Africa . . 0.2 . 0.5 0.2
31 Venezuela . . 0.2 0.5 . 0.2
32 Viet Nam . . . . 0.7 0.2
33 Brazil . 0.4 . 0.4 . 0.2
34 New Zealand . . . 0.2 0.2 0.1
35 Nigeria . . . 0.4 . 0.1
36 Colombia . . . . 0.2 0.1
37 Czech Republic . . . 0.2 . 0.1
38 Estonia . . . 0.2 . 0.1
39 Iceland . . 0.2 . . 0.1
40 Iran, Islamic Republic of . . . . 0.2 0.1
41 Niger . . . 0.2 . 0.1
42 Norway . . 0.2 . . 0.1
43 Portugal . . 0.2 . . 0.1
44 Slovak Republic . . . . 0.2 0.1
45 Slovenia . . . . 0.2 0.1
46 Sudan . . . . 0.2 0.1
47 Thailand . . 0.2 . . 0.1

Share of the total number of publications in the field, full counts (%)


Bar chart of publication_year

Number of publications among 10% most cited in field, full counts
Obs Country 1990-1994 1995-1999 2000-2004 2005-2009 2010-2014 All years
1 All countries 46.4 52.5 76.1 52.0 32.7 259.7
2 United States 27.4 24.5 42.1 25.2 15.4 134.7
3 Japan 1.4 4.0 3.0 8.1 4.7 21.2
4 China 0.0 0.0 3.0 5.0 2.0 10.0
5 France 2.0 8.1 12.1 11.2 7.3 40.7
6 United Kingdom 3.0 10.4 11.5 6.8 5.0 36.7
7 Germany 7.0 3.3 10.8 6.2 3.0 30.3
8 Sweden 3.5 8.0 7.7 7.0 6.0 32.2
9 Russian Federation 0.0 0.0 1.0 2.0 0.0 3.0
10 India 2.0 5.0 1.5 0.0 0.0 8.5
11 Switzerland 0.0 1.5 0.0 2.0 1.0 4.5
12 Spain . . 1.0 3.0 3.0 7.0
13 Italy . 1.0 2.0 1.2 0.0 4.2
14 Canada 0.0 0.0 0.0 0.0 0.0 0.0
15 Hungary . . 1.0 2.0 0.0 3.0
16 Netherlands 1.0 0.0 0.0 1.0 1.0 3.0
17 Israel . 0.0 1.0 0.3 0.7 1.9
18 Taiwan 0.0 1.0 0.0 0.0 0.0 1.0
19 Belgium . . 1.0 0.0 1.0 2.0
20 Korea, Republic of 0.0 0.0 . 0.0 0.0 0.0
21 Austria . 2.0 1.0 0.0 0.0 3.0
22 Ukraine . 0.0 0.0 0.0 0.0 0.0
23 Argentina . 0.0 0.0 0.0 0.0 0.0
24 Chile . . . 0.0 0.0 0.0
25 Denmark 0.0 0.0 0.0 0.0 . 0.0
26 Poland . . 0.0 1.0 0.0 1.0
27 USSR 1.0 . . . . 1.0
28 Australia 1.0 . . 0.0 0.0 1.0
29 Oman . . . 0.0 0.0 0.0
30 South Africa . . 0.0 . 0.0 0.0
31 Venezuela . . 0.0 0.0 . 0.0
32 Viet Nam . . . . 0.0 0.0
33 Brazil . 0.0 . 1.0 . 1.0
34 New Zealand . . . 0.0 0.0 0.0
35 Nigeria . . . 0.0 . 0.0
36 Colombia . . . . 0.0 0.0
37 Czech Republic . . . 0.0 . 0.0
38 Estonia . . . 0.0 . 0.0
39 Iceland . . 1.0 . . 1.0
40 Iran, Islamic Republic of . . . . 0.0 0.0
41 Niger . . . 0.0 . 0.0
42 Norway . . 0.0 . . 0.0
43 Portugal . . 0.0 . . 0.0
44 Slovak Republic . . . . 1.0 1.0
45 Slovenia . . . . 0.0 0.0
46 Sudan . . . . 0.0 0.0
47 Thailand . . 0.0 . . 0.0

Number of publications among 10% most cited in field, full counts


Bar chart of publication_year

Share of publications among 10% most cited in field, fractionalized (%)
Obs Country 1990-1994 1995-1999 2000-2004 2005-2009 2010-2014 All years
1 All countries 26.6 21.4 18.1 9.3 5.5 13.1
2 United States 32.1 23.4 24.0 9.7 7.9 17.4
3 Japan 7.7 18.2 5.4 8.9 4.0 7.1
4 China 0.0 0.0 9.5 3.3 0.7 2.3
5 France 22.9 24.5 15.3 15.8 10.3 15.5
6 United Kingdom 19.4 41.6 24.6 15.4 8.3 20.1
7 Germany 47.8 8.4 28.9 15.1 3.5 18.5
8 Sweden 55.3 31.9 26.5 14.7 20.1 25.0
9 Russian Federation 0.0 0.0 0.6 1.8 0.0 0.6
10 India 36.4 19.8 8.1 0.0 0.0 8.3
11 Switzerland 0.0 38.9 0.0 11.1 8.4 12.6
12 Spain . . 12.1 19.6 49.2 27.2
13 Italy . 42.9 28.8 5.6 0.0 13.9
14 Canada 0.0 0.0 0.0 0.0 0.0 0.0
15 Hungary . . 100.0 17.8 0.0 15.2
16 Netherlands 25.0 0.0 0.0 75.0 24.5 25.4
17 Israel . 0.0 50.0 5.0 23.2 11.6
18 Taiwan 0.0 25.0 0.0 0.0 0.0 9.6
19 Belgium . . 100.0 0.0 8.2 15.9
20 Korea, Republic of 0.0 0.0 . 0.0 0.0 0.0
21 Austria . 100.0 62.5 0.0 0.0 35.1
22 Ukraine . 0.0 0.0 0.0 0.0 0.0
23 Argentina . 0.0 0.0 0.0 0.0 0.0
24 Chile . . . 0.0 0.0 0.0
25 Denmark 0.0 0.0 0.0 0.0 . 0.0
26 Poland . . 0.0 33.3 0.0 8.6
27 USSR 6.3 . . . . 6.3
28 Australia 66.7 . . 0.0 0.0 36.4
29 Oman . . . 0.0 0.0 0.0
30 South Africa . . 0.0 . 0.0 0.0
31 Venezuela . . 0.0 0.0 . 0.0
32 Viet Nam . . . . 0.0 0.0
33 Brazil . 0.0 . 20.0 . 15.8
34 New Zealand . . . 0.0 0.0 0.0
35 Nigeria . . . 0.0 . 0.0
36 Colombia . . . . 0.0 0.0
37 Czech Republic . . . 0.0 . 0.0
38 Estonia . . . 0.0 . 0.0
39 Iceland . . 100.0 . . 100.0
40 Iran, Islamic Republic of . . . . 0.0 0.0
41 Niger . . . 0.0 . 0.0
42 Norway . . 0.0 . . 0.0
43 Portugal . . 0.0 . . 0.0
44 Slovak Republic . . . . 100.0 100.0
45 Slovenia . . . . 0.0 0.0
46 Sudan . . . . 0.0 0.0
47 Thailand . . 0.0 . . 0.0

Share of publications among 10% most cited in field, fractionalized (%)


Bar chart of publication_year

Field normalized citation rate (cf), fractionalized
Obs Country 1990-1994 1995-1999 2000-2004 2005-2009 2010-2014 All years
1 All countries 2.28 1.55 1.40 0.97 0.77 1.19
2 United States 2.81 1.90 1.67 1.05 0.85 1.49
3 Japan 0.65 1.26 0.87 0.84 0.95 0.90
4 China 0.16 0.27 0.67 0.48 0.41 0.45
5 France 2.90 1.97 1.45 1.57 1.54 1.62
6 United Kingdom 2.06 2.12 1.96 1.08 0.91 1.49
7 Germany 3.87 1.11 1.67 1.21 0.72 1.53
8 Sweden 2.43 1.65 1.83 1.29 0.93 1.50
9 Russian Federation 0.09 0.21 0.25 0.52 0.33 0.33
10 India 3.32 1.51 0.82 0.40 0.19 0.92
11 Switzerland 1.62 2.09 1.38 1.07 1.36 1.40
12 Spain . . 1.22 1.22 2.29 1.55
13 Italy . 1.76 2.50 2.02 0.35 1.79
14 Canada 0.77 0.62 0.54 0.31 0.46 0.52
15 Hungary . . 3.00 1.26 0.41 1.03
16 Netherlands 0.95 0.63 0.95 3.00 0.84 1.09
17 Israel . 0.44 1.55 0.65 1.16 0.78
18 Taiwan 0.96 1.05 1.03 0.82 0.27 0.86
19 Belgium . . 4.35 0.96 0.77 1.20
20 Korea, Republic of 1.90 1.46 . 0.36 0.27 0.85
21 Austria . 3.49 3.80 0.33 0.50 1.80
22 Ukraine . 0.09 0.13 0.00 0.40 0.11
23 Argentina . 1.58 0.38 0.46 1.10 0.75
24 Chile . . . 0.80 0.10 0.44
25 Denmark 0.98 1.51 0.00 0.45 . 0.82
26 Poland . . 0.34 9.74 0.66 2.79
27 USSR 1.18 . . . . 1.18
28 Australia 2.33 . . 0.07 0.39 1.39
29 Oman . . . 0.28 0.35 0.33
30 South Africa . . 0.07 . 0.11 0.10
31 Venezuela . . 0.33 0.32 . 0.32
32 Viet Nam . . . . 0.41 0.41
33 Brazil . 0.31 . 1.32 . 1.11
34 New Zealand . . . 0.13 0.38 0.25
35 Nigeria . . . 0.26 . 0.26
36 Colombia . . . . 0.64 0.64
37 Czech Republic . . . 1.82 . 1.82
38 Estonia . . . 0.19 . 0.19
39 Iceland . . 2.73 . . 2.73
40 Iran, Islamic Republic of . . . . 0.41 0.41
41 Niger . . . 0.00 . 0.00
42 Norway . . 0.42 . . 0.42
43 Portugal . . 0.04 . . 0.04
44 Slovak Republic . . . . 3.27 3.27
45 Slovenia . . . . 1.57 1.57
46 Sudan . . . . 1.37 1.37
47 Thailand . . 1.00 . . 1.00

Field normalized citation rate (cf), fractionalized


Bar chart of publication_year