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ISNAP Seminars - Abstracts 2015 Spring


Topic: Investigation of transitional rare earth nuclei using light ion reactions: Nuclear Structure and Surrogates

Prof. Cornelius Beausang ( University of Richmond ) / January 19, 2015

For several years, the Richmond group has been investigating the low/medium spin structure of N ~ 90 rare earth nuclei utilizing light ion transfer reactions, such as (p,d), (p,t) and inelastic proton scattering: work relevant for both basic nuclear structure and for surrogate (n,γ) cross section measurements. Such light ion induced reactions populate a variety of states and structures from the ground state to very high excitation energies, up to and indeed beyond the neutron separation energy. Thus we are probing the relatively unexplored bound state quasi-continuum at high energy and medium spin. Our recent work has focused on Sm and Gd nuclei and on several aspects: Single particle structures of odd N nuclei: Measurements of the spin distribution in the high energy bound quasi-continuum: Precision cross section measurements for excited states: and the properties of a intense feature, called the peak-like-feature observed just above the pair gap in all five even-even Gd and Sm nuclei studied to date.


Topic: Stellar Neutron Sources and s-Process in Massive Stars

Rashi Talwar ( University of Notre Dame ) / January 26, 2015

Potential stellar neutron sources for the s-process in massive stars are associated with α-capture reactions on light nuclei. The capture-reaction rates provide the reaction flow for the buildup of the neutron source 22Ne during the helium-burning phase in stars. A critical influence on these reactions is expected to come from low-energy resonances at stellar energies below 800keV. Direct measurements of capture reactions to study these resonances are handicapped by the Coulomb barrier. Also, it is possible that some of these resonances correspond to pronounced cluster structures near the α-threshold. Hence, inelastic α-scattering on 26Mg has been used as an alternative tool to probe into the level structure. Also α-transfer technique has been used to extract α-strength information. In reference to this, the experiments performed using the Grand Raiden Spectrometer at RCNP, Osaka will be discussed and results will be presented.


Topic: Low energy nuclear physics research at LLNL

Dr. Jason Burke ( Lawrence Livermore National Laboratory ) / February 3, 2015

The low energy nuclear physics program at LLNL consists of a myriad of accelerator based and table top experiments. Studies include nuclear structure, neutron induced cross section measurements, determination of cross sections using the surrogate reaction technique, nuclear-atomic plasma induced interactions and beta decay studies. In this seminar, I will provide an overview of our low energy nuclear physics research program at LLNL. These include efforts at the Texas A&M Cyclotron Institute, Argonne National Laboratory, Lawrence Berkeley National Laboratory and Los Alamos National Laboratory. The Hyperion, Hydra and NeutronSTAR detector systems will also be discussed in detail.


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Topic: Measurement of the plasma astrophysical S factor for the 3He(d, p)4He reaction in exploding molecular clusters

Dr. Marina Barbui ( Texas A&M University ) / February 9, 2015



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Dr. Benjamin Crider ( NSCL/MSU ) / February 16, 2015



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Dr. Yogesh Gupta ( University of Notre Dame ) / February 23, 2015



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Topic: Proton-capture reactions in thermonuclear supernovae and the p process

Dr. Kerstin Sonnabend ( Goethe University Frankfurt, Germany ) / February 26, 2015

Most of the elemental abundances beyond the so-called iron peak of the solar abundance distribution are produced by neutron-capture reactions in the r and s processes. However, there are about 35 isotopes on the proton-rich side of the valley of stability that are shielded against these reaction chains. These isotopes are usually referred to as ρ nuclei and are thought to be produced by different mechanisms in a number of astrophysical scenarios. One of these scenarios is a thermonuclear or type Ia supernova explosion. Thermonuclear supernovae provide a hot scenario where the ρ nuclei can be synthesized by the γ process and also by a series of proton-capture reactions.
The reactions producing the most abundant p nucleus 92Mo and their experimental investigation will be presented, e.g., recent results on the investigation of the 90Zr(ρ, γ) reaction using high-resolution γ-ray spectroscopy at Cologne, Germany, and steps towards the study of the 91Nb(ρ, γ) reaction in direct kinematics at FRANZ, Frankfurt, Germany. Future possibilities at different experimental facilities will be discussed in a detailed outlook.

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Prof. Justin Frantz ( Ohio University ) / March 16, 2015



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Prof. Thomas Shaefer ( University of North Carolina ) / March 23, 2015



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Prof. Jaideep Singh ( NSCL/MSU ) / March 30, 2015



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Topic: TBA

Dr. Ania Kwiatkowski ( TRIUMF) / April 13, 2015



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Prof. Anatoli Afanasjev ( Mississippi State University ) / April 20, 2015



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Dr. Michael Kruse ( Lawrence Livermore National Lab ) / April 27, 2015



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Topic: TBA

Prof. Sandrine Courtin ( University of Strasbourg, France ) / May 4, 2015




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