Isotopic masses and abundances

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Material Information

Title:
Isotopic masses and abundances
Series Title:
United States. Atomic Energy Commission. MDDC ;
Physical Description:
5 p. : ill. ; 27 cm.
Language:
English
Creator:
Bethe, H. A
Christy, R. F
Los Alamos Scientific Laboratory
U.S. Atomic Energy Commission
Publisher:
Atomic Energy Commission
Place of Publication:
Oak Ridge, Tenn
Publication Date:

Subjects

Subjects / Keywords:
Isotopes   ( lcsh )
Isotopes -- Tables   ( lcsh )
Chemical elements   ( lcsh )
Genre:
federal government publication   ( marcgt )
bibliography   ( marcgt )
technical report   ( marcgt )
non-fiction   ( marcgt )

Notes

Bibliography:
Includes bibliographical references.
Restriction:
"Date Declassified: March 6, 1947."
Statement of Responsibility:
by H.A. Bethe and R.F. Christy.
General Note:
Manhattan District Declassified Code.
General Note:
"LADC-285."
General Note:
Chiefly tables.
General Note:
"Date of Manuscript: July 21, 1943."

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 005024264
oclc - 288609671
System ID:
AA00009259:00001


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UNITED STATES ATOMIC ENERGY COMMISSION

MDDC-887

ISOTOPIC MASSES AND ABUNDANCES (LADC-285)

By
H. A. Bethe
R. F. Christy


July 21, 1943

Los Alamos Scientific Laboratory


WL Technkal Information Division, ORE, Oak Ridge, Tennessee







/rS^

S.I .- .*,




















Date Declassified: March 6, 1947


Issuance of this document does not constitute
authority for declassification of classified
copies of the same or similar content and title
and by the same authors.


Reproduced direct from copy
as submitted to this office.


PRINTED IN USA
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ISOTOPIC MASSES AND ABUNDANCES*


By H. A. Bethe and R. F. Christy

r
This table contains the isotopic mass values which we consider most reliable. As can be seen
from the given probable errors, the masses up to neon are very much more accurately known than for
the heavier elements. The lighter masses were calculated, taking into account all of the more accurate
data from mass spectrograph as well as disintegrations, and attempting the best possible fit.

Abbreviations used in the isotopic mass table:

For stable isotopes, the abundance is given in per cent. Radioactive elements are indicated by the
particle they emit (i or 0 +); 3c means that the nucleus captures an orbital electron but does not emit
positrons. P means instability against disintegration into heavy nuclear particles. Mass values, in
parenthesis, refer to nuclei which have not yet been produced.

The errors listed are meant to be about 3 times the probable or twice the standard error. For
theoretical estimates, the error is.usually not given.

Sources of the data are indicated as follows:

I-Calculations by Betty J. Isaacs, Cornell University, Master's Thesis, 1942.

W-Wigner, Memorandum No. 24, April 2, 1940.

B-Barkas, Phys. Rev. 55:691 (1939).

M-Mass spectrograph value (usually most reliable).

D-From disintegration experiments involving heavy particles from end-point of p-spectrum.

C -Calculated value.

corr-corrected in view of more recent accurate determination of the mass of a neighboring
isotope, from which the mass of the given isotope is obtained through a disintegration
measurement or a theoretical estimate.
E Estimate.










This is Section 19 of LA11, Los Alamos Handbook of Nuclear Physics.


MDDC 887













2 1 MDDC 887


Abundance Error
Z Element A per cent Mass x 105 Source

0 N 1 1.00893 3 ED
I H I 5&.i? 1.008123 0.6 IM
1 H 2 .02 2.014708 1.1 IM
I H 3 ,- 3.01702 3.4 ID
2 He 3 10-5 3.01700 4 IN
2 He 4 100 4.00360 3 IM and D
2 He 5 P 5.0137 35 ID
2 He 6 .0-209 50
3 Li 5 P (5.0136) (60) WC
3 Li 6 7.9 6.01697 5 ID
3 Li 7 32.1 7.01822 6 IM and D
3 Li 8 3 8.02502 7 D
4 Be 6 ,+ 6.0-19 (100) WC
4 Be 7 ,.c 7.01916 7 ID
4 Be 8 P 8.00785 7 ID
4 Be 9 100 9.01563 6 ID
4 Be 10 i- 10.01677 8 ID
4 Be 11 P (11i.077) WC
5 B 9 P 9.01620 7 ID
5 B 10 18.4 10.01618 9 IM and D
5 B 11 81.6 11.01Z84 8 IM and D
5 B 1 3 12.0i90 70 ID
5 B 13 ,- (13.0207) WC
6 C 11G 3, 10.0210 30 ID
6 C 11 1.01495 9 ID
6 C 12 98.9 12.00382 4 IM
6 C 13 1.; 13.00751 10 IM and D
6 C 14 J- 14.00767 5 ID and i
6 C I5 (15.0165) WC
7 N 12 (p0) (12.0233) WC
7 N 13 3 13.00988 7 ID
7 N 14 99.62 14.00751 4 IM














MDDC 887


Elemer:t

N

N

N

0

0

0

0

0

0

F

F

F

F

F
O






F

F


Abundance
per cent

5.38

/3-

0-
j +


C2.76
99.76

0.04

0.20

Ild-)






0-









90.0

0.27

9.73



I +

100








77.4

11.5

11.1
11.1


Mass

15.00489

> 16.0065
< 16.011

(17.014)

(14.0131)
15.0078

16.000000

17.00450

18.0049

19.0139)

(16.0175)

17.0075

18.0665

19.00450

>20.0042
<20.0092

(21.0059)

(18.0114)
19.00781

19.99877

20.99963

21.99844

(23.0013)

(21.0035)

21.9999

22.99618

23.9975

(24.9967)

(22.0062)

23.0002

23.9924

24.9938

25.9898


Error
.x 10s

21







40


6

40




30

60

26







20

10

22

36




50

31
45




40

60

90

50


Source

IM

13
ID

WC

WC

113

Standard

ID

WM

WC

WC

ID

WD

IM

13
ID

WC

WC

W3

IM

IM

IM

WC

WC

13
ID

ID

WC

WC


B3

WD

WD













4 MDDC 887


Abundance Error
Z Element A per cent Mass x 10' Source

12 Mg 27 P- 26.9928 150 W3
13 Al 25 1 + 24.9981 100 WP
13 Al 26 S+ 25.9929 150 WP
13 Al 27 100 26.9899 80 WD
13 Al 28 V- 27.9903 70 W3
13 Al 29 8- 28.9893 80 WP
13 Al 30 (29.9954) WC
14 Si 27 1 + 26.9949 90 I1
14 Si 28 89.6 27.9866 60 WM
14 Si 29 6.2 28.9866 60 WM
14 Si 30 4.2 29.9832 90 WD
14 Si 31 30.9862 60 WE
14 Si 32 (31.9849) WC
15 P 29 + (28.9919) (100) WC
15 P 30 0+ 29.9873 100 IP
15 P 31 100 30.9843 50 WM
15 P 32 p- 31.9827 40 vI
15 P 33 (32.9826) WC
16 S 31 + (30.9899) C
16 S 32 95.0 31.98089 7 IM
16 S 33 0.74 32.9800 60 W corr
16 S 34 4.2 33.97710 35 IM
16 S 35 A- 34.9788 80 W corr
16 S 36 0.016 35.978 100 W
17 C1 33 + (32.9860) WC corr
17 Cl 34 8~ 33.9801 I8
17 Cl 35 75.4 34.97867 21 IM
17 Cl 36 Oc 35.9788 100 W
17 CI 37 24.6 36.97750 14 IM
17 C1 38 0- 37.981 300 W
17 Cl 39 0- (38.9794) WC
18 A 35 + (34.9850) C


*iiE












MDDC 887 [5


Abundance Error
Z Element A per cent Mass x 10' Source

18 A 36 0.307 35.9780 100 W
18 A 37 Oc (36.9777) E
18 A 38 0.061 37.974 250 ID
18 A 39 (38.9755) WC
18 A 40 99.63 39.9756 60 IM
18 A 41 13- 40.9770 60 W
19 K 37 0 1 (36.9830) WC
19 K 38 P+ (37.9795) WC
19 K 39 93.3 (38.9747) WC
19 K 40 0.012 39.9760 100 W
20 Ca 40 96.96 39.9753 150 E
20 Ca 42 0.64 41.9711 W
20 Ca 43 0.15 42.9723 W
20 Ca 44 2.06 -
20 Ca 45 0- 44.968 G
21 Sc 45 100 44.9669 ID
22 Ti 46 45.9661 100 IM
22 Ti 47 46.9647 100 IM
22 Ti 48 47.9631 50 IM
22 TI 49 48.9646 60 IM
22 Ti 50 49.9621 40 IM
22 Ti 51 50.9587 100 W corr
23 V 51 50.9577 50
24 Cr 51 Pc 50.958 W corr
24 Cr 52 81.6 51.956 -W corr
24 Cr 53 10.4 52.956 W corr
25 Mn 55 100 54.957 E
26 Fe 54 6.04 53.957 W corr
26 Fe 56 91.57 55.9568 170 IM
26 Fe 57 2.11 56.957 W corr
26 Fe 58 0.28,




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