From 7dfcc480ba1e19bd3232349fc733caef94034292 Mon Sep 17 00:00:00 2001
From: stainer_t <thomas.stainer@oecd-nea.org>
Date: Mon, 8 Sep 2025 13:48:49 +0200
Subject: Initial commit from Polytechnique Montreal

---
 Dragon/src/LIBA22.f | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 Dragon/src/LIBA22.f

(limited to 'Dragon/src/LIBA22.f')

diff --git a/Dragon/src/LIBA22.f b/Dragon/src/LIBA22.f
new file mode 100644
index 0000000..30905d7
--- /dev/null
+++ b/Dragon/src/LIBA22.f
@@ -0,0 +1,117 @@
+*DECK LIBA22
+      SUBROUTINE LIBA22(NG,TT,NT0,NSECT0,FGTD,TEMP,SECT0,SECT)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Temperature interpolation of a cross section array stored in the
+* APOLIB-2 format.
+*
+*Copyright:
+* Copyright (C) 2002 Ecole Polytechnique de Montreal
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation; either
+* version 2.1 of the License, or (at your option) any later version
+*
+*Author(s): A. Hebert
+*
+*Parameters: input
+* NG      number of energy groups.
+* TT      temperature of isotope.
+* NT0     number of tabulated temperatures.
+* NSECT0  size of vector SECT0.
+* FGTD    first temperature-dependent energy group.
+* TEMP    tabulated temperatures.
+* SECT0   input cross section data in APOLIB-2 compressed format.
+*
+*Parameters: output
+* SECT    interpolated cross section.
+*
+*-----------------------------------------------------------------------
+*
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      INTEGER NG,NT0,NSECT0
+      REAL TT,TEMP(NT0),SECT0(NSECT0),SECT(NG)
+*----
+*  LOCAL VARIABLES
+*----
+      CHARACTER HSMG*131
+      PARAMETER (NINT=2,DTMIN=1.0)
+      INTEGER FGTD
+      DOUBLE PRECISION S
+      DOUBLE PRECISION, ALLOCATABLE, DIMENSION(:) :: DTEMP,WEIJHT
+*----
+*  SCRATCH STORAGE ALLOCATION
+*----
+      ALLOCATE(DTEMP(NT0),WEIJHT(NT0))
+*
+      IF(NSECT0.EQ.NG) THEN
+        DO 10 I=1,NG
+        SECT(I)=SECT0(I)
+   10   CONTINUE
+        RETURN
+      ENDIF
+*
+      DO 15 I=1,NT0
+      DTEMP(I)=TEMP(I)
+   15 CONTINUE
+      IF(NT0.EQ.1) THEN
+        IPROX=1
+        IGTFIX=1
+      ELSE
+        CALL LIBA28(TT,DTEMP,NT0,NINT,WEIJHT,IORD,IPROX,I0)
+        IF(ABS(TT-TEMP(IPROX)).LE.DTMIN) THEN
+          IGTFIX=1
+        ELSE IF((TT.LT.TEMP(1)).OR.(TT.GT.TEMP(NT0))) THEN
+          WRITE(HSMG,'(A,F8.2,A,F8.2,A,F8.2)')
+     1    'LIBA22: A TEMPERATURE', TT,'K IS NOT INCLUDED BETWEEN ',
+     2    TEMP(1),' AND ',TEMP(NT0)
+          WRITE(6,'(/1X,A)') HSMG
+          IGTFIX=2
+        ELSE
+          IGTFIX=0
+        ENDIF
+      ENDIF
+*
+      IDIS=NG+1-FGTD
+      IPID=(IPROX-1)*IDIS
+      IF(FGTD.GT.1) THEN
+        DO 20 I=1,FGTD-1
+        SECT(I)=SECT0(I)
+   20   CONTINUE
+      ENDIF
+      IF(IGTFIX.EQ.1) THEN
+        ISECT0=FGTD+IPID
+        IF(ISECT0+IDIS-1.GT.NSECT0) CALL XABORT('LIBA22: NSECT0 OVERFL'
+     1  //'OW.')
+        DO 30 I=1,IDIS
+        SECT(FGTD+I-1)=SECT0(ISECT0+I-1)
+   30   CONTINUE
+      ELSE
+        DO 50 I=FGTD,NG
+        S=0.D0
+        ID=I+I0*IDIS
+        IDP=I+IPID
+        DO 40 J=1,IORD
+        S=S+WEIJHT(J)*SECT0(ID)
+        ID=ID+IDIS
+   40   CONTINUE
+        IF(IGTFIX.EQ.2) THEN
+          IF(SECT0(IDP).GE.0.) THEN
+             S=MAX(0.D0,S)
+          ELSE
+             S=MIN(S,0.D0)
+          ENDIF
+        ENDIF
+        SECT(I)=REAL(S)
+   50   CONTINUE
+      ENDIF
+*----
+*  SCRATCH STORAGE DEALLOCATION
+*----
+      DEALLOCATE(WEIJHT,DTEMP)
+      RETURN
+      END
-- 
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