RECENT.exe - is a code to add the contribution of resonances to the cross sections. ENDF/B allows cross sections to be represented as a contribution of resonance parameters and tabulated background corrections. This code will add the resonance contribution to the background cross sections in order to define the cross sections as linearly interpolable tables. Therefore subsequent codes need only deal with tabulated, linearly interpolable cross sections.

The first version of RECENT was developed by D.E. Cullen in October 1979, the last one - in January 2015. On our site we present the last version for work on PC under MSDOS (WINDOWS).

A task input file has to be named Recent.inp, information about process of work this code is registered in report output file RECENT.LST, the ENDF formatted input file is not changed, the result is written in new ENDF formatted file.

The requirements to the task input file are presented in the file RECENT_TAB.pdf.

RECENT_TAB.pdf

Line

Column (format)

Explanation of parameters

1

1-11 (I11)

Selection criteria (0=MAT, 1=ZA) (DEFault = 0)

12-22 (E11.4)
Minimum cross section of interest (barns).
0.0 or less - the program will use 1.0e-10 barn (DEF).

23-33 (I11)

Treatment of reactions for which background cross section is not given.
= 0 – ignor (i.e. no output) (DEF)
= 1 – output resonance contribution.

34-44 (І11)

Operating mode
= 0 – calculate. Minimum output listing (DEF).
= 1 – calculate. List all resonance parameters.
= 2 – EDIT mode. No calculation.

45-55 (І11)

Negative cross section treatment
= 0 – O.K. – No change.
= 1 – Set = 0.

56-66 (І11)

Monitor mode selection
= 0 – Normal operation (DEF).
= 1 – Monitor progress of reconstruction of file 2 data and combining file 2 and file 3 data.

2

1-60 (А60)

ENDF/B input data filename (DEF option ENDFB.IN)

3

1-60 (А60)

ENDF/B output data filename (DEF option ENDFB.OUT)

4-N

1 -11 (І11)

Minimum MAT or ZA
(see 1-11, line 1)

Up to 100 MAT or ZA ranges may be specified, one range per line.
The list is terminated by a BLANK line.

If the the UPPER limit of any request is less than the LOWER limit, the UPPER limit will be set equal to the LOWER limit.

If the first request line is BLANK it will terminate the request list and cause all data to be retrieved.

The lower and upper ENERGY limits must be ZERO, or BLANK (DEF), unless you wish to only process a portion of resonance regions.
These energy limits are only read from the first MAT/ZA request line.
If both are ZERO (or BLANK) the entire resonance region for each material will be processed.
If limits are input only that portion of the resonance region for each material which lies between these limits will be processed.

12 -22 (І11)

Maximum MAT or ZA
(see 1-11, line 1)

23-33 (E11.4)

Lower ENERGY limit for processing

34-44 (E11.4)

Upper ENERGY limit for processing

К

1-11 (E11.4)

Energy for ERROR law

If the error law is energy independent only a single error is given (DEFault 0.001)

If the error law is energy dependent up to 20 energies, error pairs are allowed. For an energy dependent error law all energies must be ascending energy order.

The end of error law is terminated by a BLANK line.

12-22 (E11.4)

Allowable fractional error for error law

To facilitate the work with RECENT we present a version of the task input file RECENT.inp (several examples of task input file anybody find in the end of file RECENT.pdf).

Let RESULT.1 is the ENDF formatted file after processing by the LINEAR code. Assuming that we intend to calculate within an accuracy of 1 per-cent (0.01 as a fraction) all neutron cross sections for included materials. Let name of output ENDF formatted file will be RESULT.2.
The asterisks in this example, following below, in input file have to correspond to the blanks. Here they are presented to facilitate the calculation of positions. ********10********20********30********40********50********60********70********80 12345678901234567890123456789012345678901234567890123456789012345678901234567890 **********1********0.0**********1**********1**********0**********0 RESULT.1 RESULT.2 **********1******99999********0.0********0.0 ******************************************************************************** ************1.00000-02 ******************************************************************************** 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Running of the code: RECENT.EXE

LINEAR

RECENT.exe

SIGMA1

GROUPIE

MIXER

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Line	Column (format)	Explanation of parameters
1	1-11 (I11)	Selection criteria (0=MAT, 1=ZA) (DEFault = 0)
	12-22 (E11.4)	Minimum cross section of interest (barns). 0.0 or less - the program will use 1.0e-10 barn (DEF).
	23-33 (I11)	Treatment of reactions for which background cross section is not given. = 0 – ignor (i.e. no output) (DEF) = 1 – output resonance contribution.
	34-44 (І11)	Operating mode = 0 – calculate. Minimum output listing (DEF). = 1 – calculate. List all resonance parameters. = 2 – EDIT mode. No calculation.
	45-55 (І11)	Negative cross section treatment = 0 – O.K. – No change. = 1 – Set = 0.
	56-66 (І11)	Monitor mode selection = 0 – Normal operation (DEF). = 1 – Monitor progress of reconstruction of file 2 data and combining file 2 and file 3 data.
2	1-60 (А60)	ENDF/B input data filename (DEF option ENDFB.IN)
3	1-60 (А60)	ENDF/B output data filename (DEF option ENDFB.OUT)
4-N	1 -11 (І11)	Minimum MAT or ZA (see 1-11, line 1)	Up to 100 MAT or ZA ranges may be specified, one range per line. The list is terminated by a BLANK line. If the the UPPER limit of any request is less than the LOWER limit, the UPPER limit will be set equal to the LOWER limit. If the first request line is BLANK it will terminate the request list and cause all data to be retrieved. The lower and upper ENERGY limits must be ZERO, or BLANK (DEF), unless you wish to only process a portion of resonance regions. These energy limits are only read from the first MAT/ZA request line. If both are ZERO (or BLANK) the entire resonance region for each material will be processed. If limits are input only that portion of the resonance region for each material which lies between these limits will be processed.
	12 -22 (І11)	Maximum MAT or ZA (see 1-11, line 1)
	23-33 (E11.4)	Lower ENERGY limit for processing
	34-44 (E11.4)	Upper ENERGY limit for processing
К	1-11 (E11.4)	Energy for ERROR law	If the error law is energy independent only a single error is given (DEFault 0.001) If the error law is energy dependent up to 20 energies, error pairs are allowed. For an energy dependent error law all energies must be ascending energy order. The end of error law is terminated by a BLANK line.
	12-22 (E11.4)	Allowable fractional error for error law