coulomb excitation data analysis codes; gosia 2007 - Physics and ...

5.20 OP,RAW (RAW UNCORRECTED γ YIELDS)This option allows defining the γ-intensities for some, or all, experiments as “raw“, i.e. not detector efficiencycorrected.In addition, the raw γ intensities can be summed over a set of γ detectors. This feature is importantwhen analyzing data from multidetector arrays (crystal balls). Spectra from the γ detectors symmetric withrespect to the recoil direction, identically Doppler-shifted, can be added to increase statistics and to reducethe number of datasets to be processed (such sets of data will be referred to as “clusters“). GOSIA can handlesuch data provided that the efficiency calibration of the individual detectors is input. This information shouldbe given using OP,RAW and should be executed if at least one experiment involves raw data or clusters.OP,RAW should immediately follow OP,YIEL (5.30). If OP,RAW is to be used, the first entry of OP,GDET(5.10) should be negative to produce the additional file, TAPE8, required by OP,RAW. Do not use OP,RAWif all γ intensities are efficiency-corrected.Energy-dependent efficiency calibration for each individual γ detector is assumed to follow the functionalform used by the code GREMLIN (see Chapter 12).The input to OP,RAW is as follows:IEXP Number of experiment to be labeled as raw (according to the sequence of CONT suboption EXPT).A1, A2,....A8 Logical detector 1A1, A2,....A8 Logical detector 2··A1, A2,...A8 Parametrization of efficiency curves for all γ detectorsusedintheexperimentIEXP. ParametersA1 through A8 correspond to a 0 ,a 1 ,a 2 ,a 3 ,f,N,b,c,asdefined in GREMLIN. See Chapter12. Use f =0 to switch off the F factor and c =0 to switch off the W factor These sets of parametersshould be ordered according to the sequence of “logical“ γ detectors, as definedinOP,YIEL(IV.30) input. The Doppler .shift of the γ energies is taken into account when evaluating the detectionefficiencyNCNumber of clusters.ID1 Number of γ detectors for cluster #1.I1, I2...I(ID1) Indices of “logical“ detectors forming cluster #1, according to the sequence defined inOP,YIEL.·0 IEXP=0 ends input.The sequence ID1... obviously should be repeated NC times to define every cluster, unless NC =0(no clusters). The whole input is to be defined for every raw experiment. The use of OP,RAW imposes animportant constraint on how the experimental γ yields should be ordered in either TAPE3 or TAPE4. Thesequence of γ yields data sets should follow the HIGHEST “logical“ detector index within a cluster. Singledetectors can be handled as if they were one-detector clusters, without labeling them as clusters.Example:Three γ detectors were used and the γ-ray spectra from the detectors labeled 1 and 3 in OP,YIELassignment were added. In this case there are two clusters, namely composite detector 1+3 and singledetector 2. The input to OP,RAW should then be as follows:99