NJOY doesn't write MT=103 (n,p) cross sections to ACE file

[DMatters]

Hi all,
I'm trying to generate an ACE file in NJOY from an ENDF file in which I've modified the 35Cl(n,p) cross sections in MT=103. However, acer doesn't appears to be generating the correct output. I've run the input file below using an unmodified ENDF file as well as the modified ENDF file with the (n,p) cross sections multiplied by 0.5 above 0.5 MeV, but when I 'diff' the two ACE files (tape 26) that NJOY generates, they're exactly the same. How can I modify my input file to pass the modified MT=103 cross sections through to the ACE file? Thanks in advance for any pointers.

moder
20 -21/
reconr
-21 -22/
'pendf tape for endf/b-vii 17-cl-35'/
1725 1 0 /
.01/
'17-cl-35 from endf/b-vii'/
0/
broadr
-21 -22 -23/
1725 1/
.01/
300/
0/
heatr
-21 -23 -24/
1725 7 0 1 0 2/
302 303 304 402 443 444 103/
gaspr
-21 -24 -25/
moder
-25 28/

acer
-21 -25 0 26 27
1 0 1/
'17-cl-35 endf-vii njoy2016'/
1725 300./
/
/
acer
0 26 33 34 35
7 1 2/
'17-cl-35 endf-vii njoy2016'/
viewr
33 36/
stop

[nathangibson14]

Hi David, Because MT600-649 are present in the file, NJOY treats MT103 as redundant. It reconstructs it from the partials, so if you only change the total, it’ll get wiped out. You can either remove the partials from the file or move your modifications to the partials. Either approach should work. Nathan Get Outlook for iOS<https://aka.ms/o0ukef>

…

________________________________ From: DMatters ***@***.***> Sent: Tuesday, April 22, 2025 5:08:30 PM To: njoy/NJOY21 ***@***.***> Cc: Subscribed ***@***.***> Subject: [EXTERNAL] [njoy/NJOY21] NJOY doesn't write MT=103 (n,p) cross sections to ACE file (Discussion #189) Hi all, I'm trying to generate an ACE file in NJOY from an ENDF file in which I've modified the 35Cl(n,p) cross sections in MT=103. However, acer doesn't appears to be generating the correct output. I've run the input file below using an unmodified ENDF file as well as the modified ENDF file with the (n,p) cross sections multiplied by 0.5 above 0.5 MeV, but when I 'diff' the two ACE files (tape 26) that NJOY generates, they're exactly the same. How can I modify my input file to pass the modified MT=103 cross sections through to the ACE file? Thanks in advance for any pointers. moderinp lines 1-38/38 (END) 20 -21/ reconr -21 -22/ 'reconr/pendf tape for 1725'/ 1725 1 0 / .01/ '17-cl-35 from endf/b-vii'/ 0/ broadr -21 -22 -23/ 1725 1/ .01/ 293.6/ 0/ heatr -21 -23 -24/ 1725 1/ 3 103/ gaspr -21 -24 -25/ moder -25 28/ acer -21 -25 0 26 27 1 0 1/ '17-cl-35 endf/b-vii njoy2016'/ 1725 293.6/ / / acer 0 26 33 34 35 7 1 2/ '17-cl-35 endf/b-vii njoy2016'/ viewr 33 36/ stop — Reply to this email directly, view it on GitHub<https://urldefense.com/v3/__https://github.com/njoy/NJOY21/discussions/189__;!!Bt8fGhp8LhKGRg!ANlAnLdxctPjDlnJ8VH3x2Sv3_QbusKkcG33zSCCQ3JAUP_j-jOkYQu41iOr7gSa_Rmcw30kUQpnBIVJPSV4uqJ0$>, or unsubscribe<https://urldefense.com/v3/__https://github.com/notifications/unsubscribe-auth/AAK6KQ6QYVSGGY4W7L52HND223DW5AVCNFSM6AAAAAB3U4AB2GVHI2DSMVQWIX3LMV43ERDJONRXK43TNFXW4OZYGIZTEMJSHE__;!!Bt8fGhp8LhKGRg!ANlAnLdxctPjDlnJ8VH3x2Sv3_QbusKkcG33zSCCQ3JAUP_j-jOkYQu41iOr7gSa_Rmcw30kUQpnBIVJPSUmV6Si$>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[DMatters]

Thanks Nathan, that solved it