B. Huber

Yale University, New Haven, CT, United States

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Publications (6)3.73 Total impact

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    ABSTRACT: ^101Pd lies in a region of nuclei where A 110 and structural changes from vibrational to rotational are significant. In order to examine the nuclear structure of ^101Pd, an experiment was performed at the Wright Nuclear Structure Laboratory at Yale University using the ESTU-1 Tandem Van de Graaff Accelerator. A beam of 70 MeV ^12C collided with ^92Zr target nuclei to produce ^101Pd via the ^12C + ^92Zr -> ^101Pd + 3n reaction. Emitted gamma-rays were detected by the SPEEDY array consisting of eight Compton-suppressed HPGe clover detectors. Then, gamma-gamma coincidence measurements were made using RadWare to analyze the data. We were able to confirm many energy levels and observe several new ones. Also, new inter-band connections have been discovered. The structure of ^101Pd was then interpreted using the strictly empirical E-GOS (E-Gamma Over Spin) method. The E-GOS plot, created by graphing energies of gamma-rays over spin versus spin, revealed a clear transition from vibrational structure to rotational structure.
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    ABSTRACT: Structural evolution is frequently characterized as a function of varying neutron or proton number. The E-Gamma Over Spin (E-GOS) method is a simple way to describe changes in the shape of a specific nucleus as a function of its angular momentum. We performed an experiment using the ESTU tandem Van de Graaff accelerator at the Wright Nuclear Structure Laboratory at Yale University. In the experiment, ˜10 different isotopes in the A=100 region were synthesized. This work focuses on ^101Pd and considers it within the framework of the E-GOS method. A summary of the results obtained and an interpretation of their implications in the context of the region will be presented.
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    ABSTRACT: Excited, low-spin states in {sup 130}Ce are populated in the {beta}{sup +}/{epsilon} decay of {sup 130}Pr and studied through off-beam {gamma}-ray spectroscopy at the Yale moving tape collector. New coincidence data lead to the construction of a substantially revised level scheme. The low-lying states of {sup 130}Ce are compared with the predictions of the X(5) critical-point model and the X(5)-{beta}{sup 4} model, and the latter is found to give better agreement with the data in terms of energies. Discrepancies in the relative B(E2) values in {sup 130}Ce and the geometrical models suggest that the {gamma} degree of freedom may play an important role in this mass region.
    Physical Review C 01/2008; 77(1). DOI:10.1103/PHYSREVC.77.014307 · 3.73 Impact Factor
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    ABSTRACT: 152Dy is one of the most studied nuclei in the nuclear chart. Excited states in 152Dy (and 153Dy) were populated via the 124Sn(33S,Xn) reaction with the beam being delivered by the ESTU tandem accelerator at the Wright Nuclear Structure Laboratory. The New Yale Plunger Device (NYPD) was used in the SPEEDY array. Lifetimes are determined using the differential decay curve method from gamma-gamma coincidence data. First results will be presented.
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    ABSTRACT: Structural evolution is often characterized as a function of nucleon number. When investigating a specific nuclide, structural evolution may be described as a function of angular momentum, referred to as the E-GOS (E-Gamma Over Spin) method. An experiment was performed using the ESTU tandem Van de Graff accelerator at the Wright Nuclear Structure Laboratory at Yale University. Several nuclei in the A 100 region were populated via the fusion-evaporation reaction ^92Zr(^12C,4n+gamma)^100Pd. Subsequent gamma ray emissions were detected using the detector array SPEEDY, which is comprised of eight clover-leafed HP Ge crystal detectors. Data were collected at four different beam energies: 66, 68, 70, and 75MeV. The data will be interpreted utilizing the E-GOS method.
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    ABSTRACT: Excited states of mixed proton-neutron symmetry have been observed in a number of nuclei--most notably and extensively in ^94Mo [1]. Such states are characterized by strong M1 transitions to symmetric partner states and are typically observed at 2-3 MeV excitation in nuclides removed from a close shell by two particles and/or two holes. The neutron-deficient ^138Nd has been populated by beta decay at the Wright Nuclear Structure Laboratory to search for mixed symmetry states four neutrons below the N=82 shell closure. Gamma-ray emissions are detected with an array of 8 HPGe clover detectors configured for angular correlations measurements and are analyzed to extract multipolarities and mixing ratios. Analysis is ongoing and results will be presented. This work is supported by the U.S. Dept. of Energy grant no. DE-FG02-91ER- 40609. [1] C. Fransen et al. Phys. Rev. C 67 (2003) 024307