1. NAME AND TITLE OF DATA LIBRARY

ENSL82-CDRL82: Evaluated Nuclear Structure Libraries.

2. NAME AND TITLE OF RETRIEVAL PROGRAMS

No retrieval program is included in the package.

3. CONTRIBUTOR

Lawrence Livermore National Laboratory, Livermore, California.

4. HISTORICAL BACKGROUND AND INFORMATION

Shortly after the issuance of the seventh edition of the "Table of Isotopes," two files of data were published: one for level schemes derived from decay data, the other for level schemes derived from particle-induced reaction data. These two files, plus certain data from the above mentioned "Table of Isotopes," formed the basis of two nuclear structure data files, ENSL and CDRL.

The 1982 versions contain corrected half lives which were in error in the original release. Unknown half lives were arbitrarily assigned values of 1.E-20s.

5. APPLICATION OF THE DATA

The ENSL file contains level schemes derived from decay data and the CDRL file contains the level schemes derived from particle-induced reaction data that have been merged into the ENSL file. The levels in each file are characterized by nucleus, level energy, parity, spin (if parity and spin are known), half-life, and number of decay modes. The nucleus, the level to which the state decays, the probability of occurrence and the Q value are given for each decay mode of a level. Levels whose decay modes are unknown, e.g., several of those derived from the particle-induced reaction data, are positively flagged. Thus, in the ENSL file the decay of a level can be followed to an eventual ground state; in the CDRL file it can be followed either to an eventual ground state or to a positive flag, indicating that nothing is known about further decay.

6. SOURCE AND SCOPE OF DATA

Included are photon energies greater than 1 MeV and probabilities greater than 0.01.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAM

Not applicable.

8. DATA FORMAT AND COMPUTERS

EBCDIC card images; CDC/IBM.

9. TYPICAL RUNNING TIME

Not applicable.

10. REFERENCES

a. Included in the documentation:

R. J. Howerton, "ENSL and CDRL: Evaluated Nuclear Structure Libraries," UCRL-50400 Vol. 23 (February 1981).

R. J. Howerton, "ENSL82 and CDRL82: The 1982 Version of Evaluated Nuclear Structure Libraries ENSL and CDRL," UCRL-50400 Vol 23 Addendum (January 1983).

b. Background information:

C. M. Lederer and V. S. Shirley, eds., Table of Isotopes, 7th ed. New York: Wiley. 1978.

11. CONTENTS OF LIBRARY

Included are the referenced documents in 10.a and one tape cartridge which contains the nuclear structure data written in EBCDIC card images.

12. DATE OF ABSTRACT

March 1984.