Pre-defined energy group structures

The following pre-defined energy group structures are available to be used with the ene card. The group boundaries are listed in in the order of increasing lethargy.

All energy group structures listed here have also extended versions where the names have a suffix of _ext, for example nj19_ext. These energy group structures have upper and lower bounds of infinity and zero, respectively. When using these energy group structures, for example the group constants are tallied with all energies also used during the Serpent simulations.

Name	Name (extended)	Groups	Description
default2	default2_ext	2	Default 2-group structure
defaultmg	defaultmg_ext	70	Default multi-group structure
nj2	nj2_ext	240	CSEWG 239 group structure
nj3	nj3_ext	30	LANL 30 group structure
nj4	nj4_ext	27	ANL 27 group structure
nj5	nj5_ext	50	RRD 50 group structure
nj8	nj8_ext	35	Laser-thermos 35 group structure
nj9	nj9_ext	69	EPRI-CPM 69 group structure
nj11	nj11_ext	70	LANL 70 group structure
nj14	nj14_ext	100	Eurlib 100-group structure
nj16	nj16_ext	174	Vitamin-e 174-group structure
nj17	nj17_ext	175	Vitamin-j 175-group structure
nj18	nj18_ext	172	XMAS 172-group structure
nj19	nj19_ext	33	ECCO 33-group structure
nj20	nj20_ext	1968	ECCO 1968-group structure
nj21	nj21_ext	315	Tripoli 315-group structure
nj22	nj22_ext	172	XMAS LWPC 172-group structure
nj23	nj23_ext	175	VIT-J LWPC 175-group structure
wms69	wms69_ext	69	WIMS 69-group structure
wms172	wms172_ext	172	WIMS 172-group structure
cas70	cas70_ext	70	CASMO 70-group structure
cas40	cas40_ext	40	CASMO 40-group structure
cas25	cas25_ext	25	CASMO 25-group structure
cas23	cas23_ext	23	CASMO 23-group structure
cas18	cas18_ext	18	CASMO 18-group structure
cas16	cas16_ext	16	CASMO 16-group structure
cas14	cas14_ext	14	CASMO 14-group structure
cas12	cas12_ext	12	CASMO 12-group structure
cas9	cas9_ext	9	CASMO 9-group structure
cas8	cas8_ext	8	CASMO 8-group structure
cas7	cas7_ext	7	CASMO 7-group structure
cas4	cas4_ext	4	CASMO 4-group structure
cas3	cas3_ext	3	CASMO 3-group structure
cas2	cas2_ext	2	CASMO 2-group structure
mupo43	mupo43_ext	43	MUPO 43-group structure
scale44	scale44_ext	44	SCALE 44-group structure
scale238	scale238_ext	238	SCALE 238-group structure