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

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

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5.29 OP,TROU (TROUBLE)This troubleshooting option can be used to pinpoint erroneous experimental <strong>data</strong> <strong>and</strong> to check if the minimizationis trapped in a local minimum. As described in detail in section 4.7, this module analyzes thecontribution to χ 2 of the de<strong>excitation</strong> γ-ray yields to ascertain if there is an inconsistency in the <strong>data</strong>. Theparameter r k defined in equation 4.71 is a measure of the consistency of the <strong>data</strong>. That is, it identifies ifthe current minimum of χ 2 , with respect to a given matrix element, results from cancellation of large <strong>and</strong>opposite contributions due to inconsistent <strong>data</strong> or whether all the <strong>data</strong> are consistent.The input consists of one record:NS, RL NS is the number of experimental yields giving the largest positive <strong>and</strong> negative componentsof the derivative of χ 2 with respect to a given matrix element to be selected <strong>and</strong> printed out. Thisinformation will appear in the output if for this given matrix element r k exceeds RL. The χ 2 functionis defined by Eq. 4.69.NOTE:1) OP,TROU must be used with, <strong>and</strong> immediately follow, OP,MINI. OP,TROU must be the last optionbefore OP,EXIT2) OP,TROU must be used in conjunction with the yields sensitivity map, i.e. print control parameterIPRM(4)in CONT (Section 5.3) must assume its default value equal to −2.3) The OP,TROU <strong>analysis</strong> will appear at the end of the output file (unit 22).109

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