OBNINSK.readme Schemes of Experimental Discrete Levels and Branchings (Provided by A.V. Ignatyuk, LEVELS: 28 October 1994 BRANCHINGS: 18 December 1997)
OBNINSK_LEVELS.DAT ------------------ The first version of the Schemes of Experimental Discrete Levels (SEDL) was compiled by the Russian Nuclear Data Center in 1989 [1]. The more complete second version of SEDL was prepared on the basis of the approved levels of the ENSDF file in 1993 [2]. SEDL contains the energies, spins and parities of levels for 1170 nuclei at the mass region of 21<A<250.
SEDL was widely used for estimation of the low-lying level densi- ties [3] and preparation of numerous discrete level schemes for statistical calculations of the neutron induced threshold reactions. The major results of such calculations were included in the Activation Data Library (ADL-3) [4].
Data for each nucleus are written in the following form:
1-st line in format(I3,1X,I3,A2,I3) identifies the number of levels included, the element number, the element symbol, and the mass number; other lines in format(5(F6.4,2F4.1,I2) contain the level energy, the minimal and maximal values of the level spin, and the level parity. The value equal to -1.0 for spins means that the spin value is not identified. Zero for parities means nonidentified values.
OBNINSK_BRANCHINGS.DAT ---------------------- This file contains available experimental data on the branching ratios for gamma-ray transitions between low-lying discrete levels (the previous name of the file was SEDL-RAD [2]). Data for 550 nuclei are included that were used for statistical calculations of the isomer production cross sections for Activation Data Library (ADL-3) [4].
Data for each nucleus are written in the following form:
1-st line in format(I8,I5) identifies the nucleus (1000Z+A) and the number of levels included; 2-nd line in format(I6,3X,F9.6,F6.1,18X,I6) indicates the level number starting from the first one for the ground state, the level energy, the parity (+/-) and spin of the level, the number of gamma-ray transitions from this level; other lines in format(6X,2I6,F12.6) contain the number of a transition, the level number of the residual level and the branching ratio for the corresponding gamma-transition.
The fields outside the formats indicated above were used in SEDL- RAD-file for some additional information required by some processing codes. Such information has no any physical meaning and should not be taken into consideration.
References ---------- 1. O.T. Grudzevich, A.V. Zelenetsky, A.B. Pashchenko. Preprint FEI-2209, Obninsk, 1989. 2. O.T. Grudzevich, A.V. Zelenetsky, A.B. Pashchenko. Reference Nuclear Parameter Library. Preprint FEI-2306, Obninsk, 1993. 3. A.V.Ignatyuk et al. Contribution to the first RIPL CRP, Cervia, 1994. 4. O.T. Grudzevich, A.V. Zelenetsky, A.V.Ignatyuk, A.B. Pashchenko. Catalog of ADL-3. VANT, Ser. Nuclear Constants, 1993, is. 3-4.