1. NAME AND TITLE OF DATA LIBRARY

MASS: Atomic Mass Evaluation.

2. NAME AND TITLE OF RETRIEVAL PROGRAM

QVALUE: A Computer Program for Computing Q-Value from DLC-25/MASS.

3. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

4. HISTORICAL BACKGROUND AND INFORMATION

Atomic masses, based on a least-squares fit to the experimental data for all nuclides for which data are available and on estimates obtained from systematics for many nuclides, are presented together with several derived data. A. H. Wapstra, Instituut voor Kernphysisch Onderzoek, Amsterdam, and N. B. Gove, Oak Ridge National Laboratory, in collaboration with the ORNL Nuclear Data Group, published the data in 1971 (see the referenced documents (b)). Since then, the Nuclear Data Group has made revisions and has made the data available on tape.

5. APPLICATION OF THE DATA

The data are necessary for, and can be applied to, many theoretical and experimental studies involving nuclear interactions.

6. SOURCE AND SCOPE OF DATA

The information given by Wapstra and Gove (1971) is divided into four parts and includes not only the atomic mass data but also various supporting data and discussion about the evaluation procedure. These various parts are: Part I--the Atomic Mass Table; Part II--Nuclear Reaction and Separation Energies; Part III--Evaluation of Input Values, Adjustment Procedures; and Part IV--Systematics of Separation and Decay Energies. The information in Gove and Wapstra (1972) is titled Part V--Nuclear Reaction Q-Values.

The DLC-25/MASS Library is in card image form with one card per nuclide. Each card contains the mass number, A, the atomic number, Z, the mass excess and its standard error (in keV). Two versions of the mass library are provided with DLC-25/MASS. One is based on the 1971 evaluation. A 1972 evaluation is also included.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAM

The QVALUE retrieval program reads the DLC-25/MASS data and calculates Q-values for reactions specified by input data. The user must specify the mass and atomic numbers of the target, projectile, and outgoing particles. The uncertainty of the Q-value is also calculated. Sample problems using both the 1971 and 1972 atomic mass libraries are included.

8. DATA FORMAT AND COMPUTER

BCD/EBCDIC card images; IBM 360/370.

9. TYPICAL RUNNING TIME

On the IBM 360/75 computer, it requires less than 5 seconds to compile and execute each sample problem.

10. REFERENCES

a. Included in the documentation:

"Description of the DLC-25/MASS Input Instructions for the QVALUE Retrieval Program," Informal note (1973).

b. Background information:

A. H. Wapstra and N. B. Gove, "The 1971 Atomic Mass Evaluation," Nuclear Data Tables 9 (4-5) (1971) 265-468.

N. B. Gove and A. H. Wapstra, "Part V, Nuclear Reaction Q-Values," Nuclear Data Tables 11 (2-3) (1972) 128-280.

11. CONTENTS OF LIBRARY

Included are the referenced document (10.a) and one (1.2MB) DOS diskette which contains the 1971 and 1972 atomic mass libraries, the source code and sample problem input and output.

12. DATE OF ABSTRACT

March 1973; reviewed May 1984.