ENTRY            M0637   20060125
SUBENT        M0637001   20060125                                 
BIB                 16         40                                 
TITLE      The photoneutron cross section of Ca-44.               
AUTHOR     (P.D.HARTY,M.N.THOMPSON)                               
INSTITUTE  (3AULAML)                                              
REFERENCE  (J,AUJ,34,505,1981)                                    
INC-SOURCE (BRST)                                                 
FACILITY   (BETAT,3AULAML)                                        
SAMPLE     3-g sample of isotopically enriched (98.5 %  44Ca) in  
            form  of a thin cylinder 25.4 mm in diameter and 3.9  
            mm thick.                                             
DETECTOR   (BF3) 4PI Halpern-type neutron detector.               
METHOD     (EXTB,SITA) The reaction yield curve  measurement.  A  
            total  of  33  yield curves were taken with the 44Ca  
            sample and 15 yield curves with the sample  removed,  
            in  order  to determine te background effects due to  
            the target holder.                                    
ANALYSIS   (PLA) The variable bin Penfold-Leiss method for cross  
            section unfolding from the  averaged  neutron  yield  
            curve.                                                
           Above the   44Ca(G,2n)   threshold   at   19.1   MeV,  
            allowance for neutron multiplicity was made  on  the  
            basis of  a statistical model,  described by sambell  
            and Spicer.                                  S        
CORRECTION  Reaction  yield  curve  correction  for photoneutron  
            multiplicity.                                         
REL-REF    (N,,R.W.SAMBELL+,J,NP/A,205,139,1973) The  method  of  
            the reaction yield curve correction for photoneutron  
            multiplicity.                                         
ERR-ANALYS (DATA-ERR) Statistical errors are given.               
STATUS     (CURVE) Data  from  Fig.  1  were prepared at the MSU  
            SINP CDFE by V.V.Varlamov.                            
COMMENT    Measurement of   the   photoneutron   cross   section  
            44Ca(g,sn) reaction (sn = n + np + 2n) has been made  
            over the photon energy range 11 - 26 MeV. Comparison  
            with 44Ca(g,p)  cross  section  shows  evidence  for  
            isospin splitting  of  the  giant  dipole  resonance  
            (GDR) in  agreement eith predictions.  some evidence  
            has also been found for deformation splitting of the  
            44CA GDR.                                             
HISTORY    (20021024C)                                            
           (20060125C) REFERENCE corrected, lowercase at MSU CDFE.
ENDBIB              40                                            
NOCOMMON                                                          
ENDSUBENT           43