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

often a subset of the experiments is sensitive only to a subset of matrix elements. The SKP,X switchrequires additional input:I(1) The indices of experiments to be skipped (experimentsI(2) are numbered according to the sequence in which· they appear in the EXPT input)·I(X).......................................................................................................SMR, This control switch causes the input file for the SIGMA program (See Section 6) to be generatedwhen OP,ERRO is executed. This switch is ignored if OP,ERRO is not executed........................................................................................................TEN, Causes GOSIA to write the statistical tensors in the system of coordinates defined by Fig. 2.3 onTAPE17 when either OP,STAR or OP,POIN is executed. The tensors written are the pure Coulombexcitation tensors, as defined by 2.30, and can subsequently be used by external programs to examinethe γ-decay process (e.g. to study the deorientation effect). The structure of the statistical tensors fileis described in Chapter 7........................................................................................................VAC, This switch is used when it is desired to change the default parameters used to evaluate thevacuum deorientation effect (2.2.1). It requires the following additional input:I,X(I): where I =1, 2, ..., 7 specifies the parameter to be overwritten, X(I) being the new value. Two zerosend this input. Theparameters are defined as in 2.53 . The index value I is as follows:I X(I) Default value1 J 1 32 Γ 0.02(ps −1 )3 Λ ∗ 0.0345(ps −1 )4 τ c 3.5(ps)5 g Z/A6 K 6.10 −67 x 0.6Acommong factor is assumed for all nuclear levels. Note that g= Z/A often is a poor estimate. Theknown g factors of the lowest states can be used to give a better estimate.Since the lifetimes are given in picoseconds the field strength parameter K is 10 −12 times the true valuein gauss (the default values corresponds to 6.10 6 gauss). Note that OP,EXPT must occur in the input filebefore the CONT option VAC, otherwise OP,EXPT will overwrite the values set by VAC.The deorientation effect can be switched off (if, for example, the influence of deorientation on the resultis to be tested) by specifying:VAC,3, 0.6, 0.0, 0...................................................................................................WRN,X. This switch causes a warning message to be printed with the comparison of experimentaland calculated yields forthose yields for which the experimental and calculated values differ by more than X standard deviations.The default setting is X =3.68