Structure of RIPL discrete level library files

R. Capote and M. Verpelli (23-02-2023)

The description of how the files are generated can be found in
INDC-NDS(0702) and in INDC-NDS(0626).
See also the 2002 and 2015 description of the RIPL discrete levels.


Content:     Changes 2020     Changes 2015     File Structure     Identification Record     Level Record     Gamma Record     Changes 2012     +X energy assignment
Major changes from the 2020 release
Based on the ENSDF snapshot of November 2021. Ground State (GS) properties are taken from Nubase2020, and separation values from AME2020

Major changes from the 2015 release
Ground State (GS) properties are taken from
Nubase2016, and separation values from AME2016

In this release, The FORTRAN format of the GAMMA record has one additional digit for the energy
((39x,i4,1x,f10.4,3(1x,e10.3)))

File Structure
Data are stored in files containing a full isotopic chain of a given element. File names indicate an element by referring to its atomic number (e.g., z026.dat).
Each Isotope has three types of records:
(i) identification,
(ii) level,
(iii) gamma.

Each isotope begins with an identification record, which is followed by the level record, which in turn is followed by the pertinent gamma records if decay of the level is known. This combination is repeated for all levels in a given isotope.

Identification Record
Each isotope begins with an identification record such as the one shown below for the case of Mg-22 (heading has been introduced to facilitate reading but does not show up in the actual file):
  SYMB    A     Z     Nol    Nog    Nmax    Nc     Sn[MeV]     Sp[MeV]
  22Mg    22    12    17     18      9      4     19.382000    5.497000

The corresponding FORTRAN format is (a5,6i5,2f12.6)
  
  
SYMB   : mass number with symbol of the element
A      : mass number
Z      : atomic number
Nol    : number of levels in the decay scheme
Nog    : number of gamma rays in the decay scheme
Nmax   : maximum number of levels up to which the level scheme is
         complete
Nc     : number of a level up to which spins and parities are unique
Sn     : neutron separation energy in MeV
Sp     : proton separation energy in MeV




Level Record
Each level record may contain the following quantities:
N1  Elv[MeV]  s   p   T1/2    Ng  J  unc  spins   nd  m  percent  mode      m   percent   mode    /.../ shift     band

1  0.000000  0.0  1  3.86E+00  0           0+      2  =  8.2000E+01 %IT     =  1.8000E+01 %B-     /.../ 0.031100  2    
2  1.246300  2.0  1  2.10E12   1           2+      0

(i3,1x,f10.6,1x,f5.1,i3,1x,(e10.3),i3,1x,a1,1x,a4,1x,a18,i3,10(1x,a2,1x,e10.4,1x,a7),f10.6,1x,3(2i))
 

Nl    :  sequential number of a level
Elv   :  energy of the level in MeV
s     :  level spin (unique). Whenever possible unknown spins up to
         Umax were inferred. Unknown and undetermined spins are entered as -1.0
p     :  parity (unique). If the parity of the level was unknown, positive or
         negative was chosen with equal probability. Parities were determined up
         to Umax as in the case of spins. The method of choice is not coded.
             The possible values are: 0 for unknown, +1 for positive and -1 for negative.
T1/2  :  half-life of the level (if known). All known half-lives or level widths
         were converted into seconds. Half-lives of stable nuclei are
         represented as -1.0E+0.
Ng    :  number of gamma rays de-exciting the level.
J     :  flag for spin estimation method (see below the list of possible flags).
unc   :  flag for an uncertain level energy. When impossible to determine, the
         relative energy of the band, the energy of these band heads were set to
         0.0 keV or, if the level order is known, to the preceding level energy
         with a note that an unknown energy X should be added. The notation uses
         X+, Y+, Z+ etc. for different bands.
spins :  original spins from the ENSDF file.
nd    :  number of decay modes of the level (if known). Values from 0 through 10
         are possible; 0 means that the level may decay via gamma-emission,
         and other decay modes are not known.
m     :  decay percentage modifier; informs a user about major uncertainties. 
         The modifiers are copied out of ENSDF with no modification, and can 
         have the following values: =, <, >, ? (unknown, but expected), 
         AP (approximate), GE (greater or equal), LE (less or equal), 
         LT (less then), SY  (value from systematics).
percent: percentage decay of different decay modes. As a general rule  the
         various decay modes add up 100%. There are, however, two exceptions:
         (i) when a small percentage decay is present, the sum may be slightly
         more then 100% due to rounding error, (ii) when beta -decay is
         followed by a heavier particle emission, the percentage of the
         beta-delayed particle emission is given as a portion of the beta-decay
         and the sum can be substantially larger then 100%. Naturally, when the
         modifier is "?" the sum is indefinite.
mode   : short indication of decay modes of a level (see Table below).
shift  : value assigned to the unknown "X", in MeV.
band   : integer assigned to band(s) to which the level is part


Spin estimation method flags
The spin values were determined in the following way. First it was checked whether a limited set of spin values could be assigned to a level based on gamma-transitions to known spin levels. In the second step, if there were 10 or more levels with known spins (they did not need to be unique); a spin distribution was determined from the experimentally known spins, plus the spins assigned in the first step. To do this the usual form of the spin distribution [Eri60,GIL65] is utilized. The experimental spin cut-off parameter s was determined from the average value of (J+1/2)2. In the case of the continuous normalized spin distribution this average yields 2s2 +1/4. Assuming that the average yields the same result in the discrete case, the experimental spin cut-off parameter sexp can easily be obtained. Levels up to the Emax value were used in this procedure. If less then 10 levels had spin assignments, then no spins were inferred; otherwise spins up to Emax were determined uniquely as described below.

Four cases were distinguished. Let Ni designate the number of spins, which are compatible with the experimental data for the ith level.
  1. Ni =0. A unique spin was determined using the spin distribution with sexp. This method is flagged as 'n'.
  2. Ni =1. In spite of uncertainties (like (1)+ ), this case was considered to be unique and the flag is 'u'.
  3. Ni >1. The spin was chosen from the limited set (eg. (1,3,4)-) using the spin continuous normalized distribution and the flag is 'c'.
  4. Above Emax the flag is left ' ' (blank).

Decay modes notation
The decay code is taken from the ENSDF format, the following table explains the meaning of the main decay modes
%B- β- decay
%EC electron capture
%EC+%B+ electron capture and β+ decay
%N neutron decay
%A α decay
%IT isomeric transition
%P proton decay
%3HE 3He decay
%B+P β+ delayed proton decay
%B-N β- delayed neutron decay
%SF spontaneous fission
%ECP electron capture delayed proton decay
%ECA electron capture delayed alpha decay
%G gamma decay
%B-2N β- delayed double neutron decay
%B+2P β+ delayed double proton decay


Gamma Record
Two examples of the gamma records are given below:
  Nf    Eg[MeV]       Pg          Pe          ICC
  3      0.055     2.790E-01   2.870E-01    5.130E-03
  1      0.113     5.330E-01   5.330E-01    0.000E+00


The corresponding FORTRAN format is (39x,i4,1x,f10.4,3(1x,e10.3))

Nf    : sequential number of the final state
Eg    : gamma-ray energy in MeV
Pg    : Probability that the level decays through photon (gamma ray) emission. 
        If no branching ratio is given in the ENSDF file, Pg=0.
Pe    : Probability of the electromagnetic transition (photon, conversion electron, pair creation). 
        The sum of the Pe gives the IT (electromagnetic transition) branching ratio of the level. 
        This is 1 unless other decay modes are listed in the level record (see example below). 
ICC   : Internal conversion coefficient of the transition.

Pe, Pg, and ICC are in the following relation:
Pe = Pg * (1 + ICC)
In the first gamma line Pe ≠ Pg since ICC ≠ 0
The sum of the Pe is 0.82, indeed the level record reports two decay modes: IT (82%) and beta- (18%)
N1  Elv[MeV]  s   p   T1/2       Ng  J  unc  spins   nd  m  percent    mode    m  percent    mode    
2   0.643400  4.0  1  2.200E-03  1            (4+)    2  =  8.2000E+01 %IT     =  1.8000E+01 %B-      
Major changes from the 2012 release

Treatment of the unknown "+X" energies


All levels having the same energy are splitted by 0.1 keV.

The internal conversion factor are calculated using BRICC

In the FORTRAN format of the LEVEL record, the half-life format is e10.3 and the decay branching is e10.4.
The two new fields at the end - in red here below
(i3,1x,f10.6,1x,f5.1,i3,1x,(e10.3),,i3,1x,a1,1x,a4,1x,a18,i3,10(1x,a2,1x,e10.4,1x,a7),f10.6,1x,3(2i))
have the following content:


"+X" energies summary

Nuclides where one or
more "+X" energies were assigned
using Nubase 2020.
# Nuclide Band Energy
021-Sc-56X50
123-V-44X271
223-V-60X0
323-V-60Y75
424-Cr-45X107
525-Mn-62X0
625-Mn-62Y343
727-Co-68X150
827-Co-68Y146.6
933-As-90X0
1035-Br-92X662
1139-Y-78X250
1239-Y-92X807
1339-Y-102Y100
1441-Nb-85Y81
1541-Nb-86X150
1641-Nb-88X130
1741-Nb-93X24.7
1841-Nb-102X94
1942-Mo-93X25
2042-Mo-111X100
2143-Tc-87X1
2243-Tc-88W0
2343-Tc-88Y70
2443-Tc-102X50
2543-Tc-114X0
2643-Tc-114Y160
2744-Ru-91X160
2844-Ru-113X131
2944-Ru-115X82
3045-Rh-90X250
3145-Rh-92X50
3245-Rh-94X300
3345-Rh-108X115
3445-Rh-110Y220
3545-Rh-112Y340
3645-Rh-114X200
3745-Rh-118X200
3846-Pd-123X100
3946-Pd-124X938
4047-Ag-94X1350
4147-Ag-96X0
4247-Ag-96Y25
4347-Ag-96Z2686.7
4447-Ag-119X20
4547-Ag-119Y0
4647-Ag-122X80
4747-Ag-123Y23.6
4847-Ag-124X0
4947-Ag-124Y50
5047-Ag-126X0
5147-Ag-126Y100
5247-Ag-129X20
5348-Cd-125X186
5448-Cd-127X285
5548-Cd-129X343
5649-In-120X300
5749-In-121Y3
5849-In-123X24.9
5950-Sn-102Y48
6050-Sn-131X65.1
6151-Sb-119X0
6251-Sb-120X50
6351-Sb-121X0
6451-Sb-128X10
6551-Sb-132X150
6651-Sb-140X31.8
6752-Te-130X19
6853-I-118X84.4
6955-Cs-117Y0
7055-Cs-117Z150
7155-Cs-118X100
7255-Cs-119X50
7355-Cs-120X100
7456-Ba-125X52.3
7557-La-124X100
7657-La-124Y0
7757-La-126X0
7857-La-126Z210
7957-La-128X100
8057-La-134X103.56
8157-La-146X0
8259-Pr-127X600
8359-Pr-130X0
8459-Pr-130Z100
8559-Pr-132X30
8659-Pr-134X0
8759-Pr-134Y67.7
8860-Nd-129Z50
8961-Pm-134X0
9061-Pm-134Y120
9161-Pm-135X0
9261-Pm-135Y171.3
9361-Pm-136X100
9461-Pm-136Y0
9561-Pm-140X429
9661-Pm-158X29
9762-Sm-133Y120
9863-Eu-136X0
9963-Eu-136Y100
10063-Eu-140X210
10163-Eu-142X450
10264-Gd-139X250
10365-Tb-141Y100
10465-Tb-143X50
10565-Tb-145X860
10665-Tb-145Y0
10765-Tb-146X150
10865-Tb-154V405
10965-Tb-154Y200
11065-Tb-156X50.37
11166-Dy-168X1151.7
11267-Ho-148X250
11367-Ho-150X25
11467-Ho-154X243
11567-Ho-156X117.63
11667-Ho-160X27.44
11768-Er-147X100
11868-Er-149X59.3
11969-Tm-151X93
12069-Tm-152X75
12169-Tm-154X70
12269-Tm-156X196.4
12369-Tm-157X100
12469-Tm-158X100
12569-Tm-162X130
12669-Tm-164X20
12769-Tm-166X12.947
12869-Tm-174X252.4
12969-Tm-177X100
13070-Yb-151X740
13170-Yb-151Y838.8
13270-Yb-153X51.8
13371-Lu-154X62
13471-Lu-154Y2593.6
13571-Lu-156X10
13671-Lu-159X100
13771-Lu-160X50
13871-Lu-161X15.5
13971-Lu-162X120
14071-Lu-162Y300
14171-Lu-167X50
14272-Hf-154X50
14373-Ta-161X61
14473-Ta-162X120
14573-Ta-163X138
14673-Ta-173X7.22
14773-Ta-176W103
14873-Ta-178X0
14973-Ta-180X2.3
15073-Ta-181X80.23
15173-Ta-183X24.84
15273-Ta-185X14.9
15373-Ta-189X1650
15475-Re-159X210
15575-Re-164X100
15675-Re-166Y280
15775-Re-169X175
15875-Re-170X0
15975-Re-172X110
16075-Re-172Y0
16175-Re-177X100
16275-Re-179X49.8
16375-Re-180X90
16475-Re-182X60
16575-Re-192X0.1
16675-Re-193X0
16775-Re-194X150
16875-Re-196X120
16976-Os-197X500
17077-Ir-164X260
17177-Ir-168X40
17277-Ir-170X40
17377-Ir-171X164
17477-Ir-172X0
17577-Ir-172Y139
17677-Ir-175X50
17777-Ir-176X50
17877-Ir-177X100
17977-Ir-185X39.8
18077-Ir-186X0.8
18177-Ir-188X40.47
18277-Ir-191X54.3
18377-Ir-194X180
18477-Ir-203X200
18578-Pt-203X59
18678-Pt-204X40
18779-Au-172X160
18879-Au-175X164
18979-Au-176X0
19079-Au-176Y139
19179-Au-179Y133.5
19279-Au-181Y210
19379-Au-185X50
19479-Au-190X200
19579-Au-195X40.16
19679-Au-204X2839.4
19780-Hg-181Y210
19880-Hg-187X58
19980-Hg-189X80
20080-Hg-191X128
20180-Hg-208X41.1
20280-Hg-210X40
20381-Tl-179X825
20481-Tl-186X20
20581-Tl-186Y0
20681-Tl-187X441.77
20781-Tl-191X297
20881-Tl-193X6.8
20981-Tl-203X50.4
21081-Tl-204X0.2
21181-Tl-209Z7
21282-Pb-185X70
21382-Pb-190X50
21482-Pb-191X58
21582-Pb-193X93
21682-Pb-199X4.7
21782-Pb-201X161.4
21882-Pb-202X49
21982-Pb-203X46.7
22082-Pb-211X39.9
22182-Pb-214X55
22282-Pb-216X55
22383-Bi-184X150
22483-Bi-184Y0
22583-Bi-186X170
22683-Bi-188X153
22783-Bi-191X49.9
22883-Bi-197X42.6
22983-Bi-198X290
23083-Bi-199X39.7
23183-Bi-200X100
23283-Bi-201X39.7
23383-Bi-202X20
23483-Bi-215X19.5
23583-Bi-216X24
23683-Bi-217X55
23784-Po-198X48.14
23884-Po-200X12.5
23984-Po-202X20.5
24085-At-192X20
24185-At-192Y0
24285-At-194Y20
24385-At-195X100
24485-At-198X104.6
24585-At-199X244
24685-At-202X190
24785-At-206X3.3
24885-At-213X39.9
24986-Rn-197X199
25086-Rn-200X19.5
25186-Rn-201X245
25286-Rn-210X45.4
25386-Rn-211X25.2
25486-Rn-213X18
25586-Rn-213Y36
25687-Fr-198Y25
25787-Fr-201X129
25887-Fr-202X257
25987-Fr-206X200
26087-Fr-210X4417.2
26187-Fr-214Y102
26287-Fr-216X210
26388-Ra-215X50.4
26489-Ac-206X200
26589-Ac-215X50
26689-Ac-216X100
26789-Ac-218X50
26889-Ac-218Y100.01
26989-Ac-222X78
27090-Th-209X370
27190-Th-215X49.7
27290-Th-217X55.09
27391-Pa-234X6.08
27492-U-239X2500
27593-Np-236X60
27693-Np-240X18
27793-Np-242Y50
27894-Pu-241X0
27995-Am-236X50
28095-Am-244X2000
28195-Am-244Y2200
28295-Am-246X30
28396-Cm-244X1100
28497-Bk-242X150
28597-Bk-242Y2000
28697-Bk-244X1500
28797-Bk-245X50
28897-Bk-248X15
28997-Bk-248Y50
29097-Bk-248Z0
29199-Es-241X230
29299-Es-243X0
29399-Es-243Y50
29499-Es-245X30
29599-Es-246X190
29699-Es-247X0
29799-Es-250X200
298100-Fm-250X1199.2
299100-Fm-253X140
300101-Md-244X200
301101-Md-246X0
302101-Md-246Y60
303101-Md-247X260
304101-Md-249X100
305101-Md-254X50
306101-Md-258X100
307102-No-253X1196
308102-No-253Y1256
309102-No-254Y902.2
310102-No-255X100
311102-No-257X300
312103-Lr-253Y30
313103-Lr-254X107
314103-Lr-255Y56
315103-Lr-259X350
316104-Rf-253X0
317104-Rf-253Y200
318104-Rf-254X1300
319104-Rf-254Y2000
320104-Rf-258Y1200
321104-Rf-258Z1500
322104-Rf-259X60
323104-Rf-261X0
324105-Db-262X50
325106-Sg-263Y51
326107-Bh-262X0
327107-Bh-262Y220
328108-Hs-267X39
329108-Hs-277X100
330109-Mt-276X250
331110-Ds-271X88
332110-Ds-279X0
333110-Ds-281X0
334111-Rg-279X0
335112-Cn-285X0
336114-Fl-289X0
Nuclides where one or
more "+X" bands were removed.
# Nuclide Band
010-Ne-28X
112-Mg-35X
212-Mg-35Y
313-Al-38X
414-Si-39X
518-Ar-36X
618-Ar-43X
719-K-48X
821-Sc-52X
926-Fe-63X
1027-Co-70X
1127-Co-70Y
1228-Ni-58X
1328-Ni-59X
1428-Ni-59Y
1528-Ni-59Z
1629-Cu-59X
1729-Cu-61X
1829-Cu-61Y
1929-Cu-76Y
2030-Zn-60X
2130-Zn-60Y
2230-Zn-65X
2330-Zn-65Y
2430-Zn-65Z
2530-Zn-68X
2631-Ga-84X
2732-Ge-65X
2832-Ge-68X
2935-Br-69X
3035-Br-76X
3137-Rb-76X
3238-Sr-80Z
3338-Sr-80Y
3438-Sr-80X
3538-Sr-80U
3638-Sr-81Z
3738-Sr-81Y
3838-Sr-81X
3938-Sr-82X
4038-Sr-83X
4139-Y-81X
4239-Y-82X
4339-Y-83U
4439-Y-83Z
4539-Y-83X
4639-Y-83Y
4739-Y-84U
4839-Y-84V
4939-Y-84Z
5039-Y-98X
5140-Zr-81X
5240-Zr-83Z
5340-Zr-83X
5440-Zr-83Y
5540-Zr-86Z
5640-Zr-86Y
5740-Zr-86U
5840-Zr-86X
5941-Nb-85Z
6041-Nb-85X
6141-Nb-86Y
6241-Nb-87Z
6341-Nb-87Y
6441-Nb-87X
6541-Nb-100X
6641-Nb-102Y
6741-Nb-102Z
6842-Mo-85Y
6942-Mo-85X
7042-Mo-88Z
7142-Mo-88U
7242-Mo-88Y
7342-Mo-88X
7443-Tc-88Z
7543-Tc-89X
7643-Tc-91X
7743-Tc-106X
7843-Tc-107X
7943-Tc-108X
8045-Rh-102X
8145-Rh-102Y
8246-Pd-103X
8346-Pd-104X
8446-Pd-105X
8547-Ag-105X
8647-Ag-110X
8747-Ag-112X
8847-Ag-112Y
8947-Ag-114Y
9047-Ag-114X
9147-Ag-116X
9247-Ag-125X
9347-Ag-126Z
9448-Cd-104X
9548-Cd-106X
9648-Cd-107X
9748-Cd-108Y
9848-Cd-108X
9948-Cd-109X
10048-Cd-125Y
10148-Cd-127Y
10249-In-100X
10349-In-109X
10449-In-111Y
10549-In-111X
10649-In-113Y
10749-In-113X
10849-In-121X
10950-Sn-102X
11050-Sn-106Y
11150-Sn-106Z
11250-Sn-106X
11350-Sn-108X
11450-Sn-115X
11551-Sb-107Y
11651-Sb-107X
11751-Sb-109X
11851-Sb-109Z
11951-Sb-109Y
12051-Sb-109W
12151-Sb-110X
12251-Sb-110Y
12351-Sb-111X
12451-Sb-111Y
12551-Sb-112Y
12651-Sb-112X
12751-Sb-114X
12851-Sb-114Y
12951-Sb-122X
13051-Sb-125X
13152-Te-110Y
13252-Te-110Z
13352-Te-110X
13452-Te-110V
13552-Te-110U
13652-Te-112X
13752-Te-112Z
13852-Te-112Y
13952-Te-113X
14052-Te-125X
14153-I-109X
14253-I-110X
14353-I-112X
14453-I-113Y
14553-I-113U
14653-I-113X
14753-I-113Z
14853-I-113W
14953-I-113V
15053-I-114X
15153-I-115Z
15253-I-115W
15353-I-115V
15453-I-115X
15553-I-115Y
15653-I-116X
15753-I-119X
15853-I-120X
15953-I-121X
16053-I-123Y
16153-I-123Z
16253-I-123X
16353-I-130X
16453-I-140X
16554-Xe-116Y
16654-Xe-116Z
16754-Xe-116X
16854-Xe-117Y
16954-Xe-117X
17054-Xe-123U
17154-Xe-125Z
17254-Xe-125Y
17354-Xe-125X
17454-Xe-125U
17554-Xe-126X
17655-Cs-112X
17755-Cs-114X
17855-Cs-116X
17955-Cs-117X
18055-Cs-119Y
18155-Cs-121X
18255-Cs-125X
18355-Cs-128X
18455-Cs-140X
18555-Cs-142X
18655-Cs-144Y
18755-Cs-144X
18856-Ba-119X
18956-Ba-119Y
19056-Ba-122X
19156-Ba-126X
19257-La-121X
19357-La-121Y
19457-La-123X
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