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Full-Text Articles in Physical Sciences and Mathematics

Estimation Of (N, F) Cross Sections By Measuring Reaction Probability Ratios, C. Plettner, H. Ai, C. W. Beausang, L. A. Bernstein, L. Ahle, H. Amro, M. Babilon, J. T. Burke, J. A. Caggiano, R. F. Casten, J. A. Church, J. R. Cooper, B. Crider, G. Gurdal, A. Heinz, E. A. Mccutchan, K. Moody, J. A. Punyon, J. Qian, J. J. Ressler, A. Schiller, E. Williams, W. Younes May 2005

Estimation Of (N, F) Cross Sections By Measuring Reaction Probability Ratios, C. Plettner, H. Ai, C. W. Beausang, L. A. Bernstein, L. Ahle, H. Amro, M. Babilon, J. T. Burke, J. A. Caggiano, R. F. Casten, J. A. Church, J. R. Cooper, B. Crider, G. Gurdal, A. Heinz, E. A. Mccutchan, K. Moody, J. A. Punyon, J. Qian, J. J. Ressler, A. Schiller, E. Williams, W. Younes

Physics Faculty Publications

Neutron-induced reaction cross sections on unstable nuclei are inherently difficult to measure due to target activity and the low intensity of neutron beams. In an alternative approach, named the “surrogate” technique, one measures the decay probability of the same compound nucleus produced using a stable beam on a stable target to estimate the neutron-induced reaction cross section. As an extension of the surrogate method, in this paper we introduce a new technique of measuring the fission probabilities of two different compound nuclei as a ratio, which has the advantage of removing most of the systematic uncertainties. This method was benchmarked …


Γ-Ray Spectroscopy Of 166Hf: X(5) In N > 90?, E. A. Mccutchan, N. V. Zamfir, R. F. Casten, M. A. Caprio, H. Ai, H. Amro, C. W. Beausang, A. A. Hecht, D. A. Meyer, J. J. Ressler Feb 2005

Γ-Ray Spectroscopy Of 166Hf: X(5) In N > 90?, E. A. Mccutchan, N. V. Zamfir, R. F. Casten, M. A. Caprio, H. Ai, H. Amro, C. W. Beausang, A. A. Hecht, D. A. Meyer, J. J. Ressler

Physics Faculty Publications

Excited states in 166Hf were populated in the β+/∈ decay of 166Ta and studied through off-beam γ –ray spectroscopy at the Yale moving tape collector. New coincidence data found no support for two previously reported excited 0+ states and led to a substantially revised level scheme. Similarities between the revised level scheme of 166Hf and the X(5) critical point symmetry are discussed, and the extent of X(5) behavior in this mass region is explored through the W and Os isotopes. Among X(5) candidates with N > 90, good agreement is observed for most energies and …


Isomeric Decay Of 208Ra, J. J. Ressler, C. W. Beausang, H. Ai, H. Amro, M. Babilon, J. A. Caggiano, R. F. Casten, G. Gurdal, A. Heinz, R. O. Hughes, E. A. Mccutchan, D. A. Meyer, C. Plettner, J. Qian, M.J. S. Sciacchitano, N. J. Thomas, E. Williams, N. V. Zamfir Jan 2005

Isomeric Decay Of 208Ra, J. J. Ressler, C. W. Beausang, H. Ai, H. Amro, M. Babilon, J. A. Caggiano, R. F. Casten, G. Gurdal, A. Heinz, R. O. Hughes, E. A. Mccutchan, D. A. Meyer, C. Plettner, J. Qian, M.J. S. Sciacchitano, N. J. Thomas, E. Williams, N. V. Zamfir

Physics Faculty Publications

Low-energy excited states of 208Ra were investigated using the 182W(30Si, 4n) reaction at the Wright Nuclear Structure Laboratory of Yale University. Fusion evaporation recoils were selected using the gas-filled spectrometer SASSYER. Delayed γ rays, following isomeric decays, were detected at the focal plane of SASSYER with a small array of three clover Ge detectors. Transitions following a proposed J π = 8+ isomer were observed, and the half-life was measured.