Neutron resonance spectroscopy: 175Lu

Results are given of high resolution measurements of the neutron resonance parameters (E0, gGAMMA/subn/0) for 446 resonances to 3 keV in 175Lu using the Columbia University Nevis synchrocyclotron. The measurements used the 202.05 m flight path for transmission measurements and the 39.57 m flight path for transmission, capture, and self-indication measurements. Values of GAMMA/sub gamma/ from (59 plus-or-minus 20) to (100 plus-or-minus 20) MeV were obtained for 40 levels, with < GAMMA/sub gamma/ > = 77 MeV. The s-wave strength function is 104S0 = (1.83 plus-or-minus 0.12) and the deduced mean s-level spacing is (3.45 plus-or-minus 0.15) eV. Using recent unpublished J assignments for levels below 238 eV by Namenson, Stolovy, and Smith, we obtain (0.55 plus-or-minus 0.20) for the ratio of the J = 4 to J = 3 s strength functions. The results to 200 eV agree with values expected from the orthogonal ensemble theory for level spacing systematics