ENTRY            M0600   20060125
SUBENT        M0600001   20060125                                 
BIB                 15         37                                 
TITLE      Studies in the vibrational  splitting  of  the  giant  
            dipole resonance. (II) 58Ni and 60Ni isotopes.        
AUTHOR     (D.G.OWEN,E.G.MUIRHEAD,B.M.SPICER)                     
INSTITUTE  (3AULAML)                                              
REFERENCE  (J,NP/A,140,523,1970)                                  
FACILITY   (BETAT,3AULAML). 35 MeV Melbourne betatron.            
INC-SOURCE (BRST)                                                 
METHOD     (EXTB,SITA)                                            
DETECTOR   (BF3) BF3  proportional  counters  arranged  in   the  
            Halpern-type system.                                  
SAMPLE     Isotopically enriched targets of  58Ni (99.89 %)  and  
            60Ni (99.79 %).                                       
ANALYSIS   (PLA) Penfold-Leiss  matrix  inversion  method  with   
            analysis bin 0.5 MeV.                                 
CORRECTION The correction for multipole neutron emission in  the  
            (g,2n) process  was  applied  after  calculating the  
            ratio of the (g,n) and (g,2n) cross sections by  (i)  
            subtracting a direct photoneutron contribution taken  
            as 10 %,  and (ii) considering  the  evaporation  of  
            neutrons from the excited compound nucleus.           
ERR-ANALYS (DATA-ERR) Statistical errors are given.               
COMMENT    The total photoneutron cross sections  for  58Ni  and  
            60Ni have  been  measured  with  bremsstrahlung from  
            threshold to 24 MeV.  Although their magnitudes  are  
            greatly different,   the  two  cross  sections  show  
            similar structure over  the  gint  dipole  resonance  
            region. The  structural features of both are in only  
            fair agreement with  the  dynamic  collective  model  
            calculations of  Huber,  and  of Seaborn,  Drechsel,  
            Arenhovel and Greiner.  Howewer the agreement of the  
            60Ni  cross  section and the collective correlations  
            calculation of seaborn et.al.  is  far  better,  and  
            thus indicates the importance of shell-model aspects. 
STATUS     (CURVE) Data  from  the  Figures  1  -  2  have  been  
            compiled at the Russia MSU INP CDFE by V.Varlamov.    
HISTORY    (20000207C)                                            
           (20060124A) XN changed to 0-NN-1, lowercase.           
ENDBIB              37                                            
NOCOMMON             0          0                                 
ENDSUBENT           40