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Nuclear Seminars 2016 Spring


  Title: Examining nuclear shell structure effects on isoscalar giant monopole resonance and nuclear incompressibility near A~90
  Speaker: Dr. Yogesh Gupta
  Institute: University of Notre Dame
  Date: Monday, February 8, 2016
  Time: 4:00 - 5:00 pm EST
  Place: Nieuwland Science Hall, Room 124

  Abstract:

Nuclear incompressibility is a fundamental quantity characterizing the equation of state (EOS) of nuclear matter. Experimentally, it may be determined from the compressional "breathing mode" of nuclear density oscillation, the isoscalar giant monopole resonance (ISGMR) in finite nuclei. Analyses of the ISGMR have implied that the determination of nuclear incompressibility is independent of the choice of the nucleus, provided that approximately 100% energy weighted sum rule (EWSR) fraction is exhausted in the ISGMR peak; this condition is satisfied for sufficiently heavy nuclei (A> 90).

In a recent work from Texas A & M group, it was claimed that the ISGMR strength distributions vary in a dramatic manner in nuclei near A~ 90 region. In particular, the A=92 nuclei, 92Zr and 92Mo, emerged quite disparate from the others. These results, if correct, imply significant nuclear structure contribution to the nuclear incompressibility in this mass region. To further examine these surprising and highly intriguing results, inelastic scattering of 385-MeV α particles has been measured on 90, 92Zr and 92Mo nuclei using the "Grand Raiden" spectrometer at RCNP, Japan. Results obtained from multipole decomposition analysis would be discussed.


Topic

Date

Speaker

89Zr (n,γ) cross sections from
a surrogate reaction approach
January 18 Dr. Shuya Ota
Lawrence Livermore
National Laboratory
Special Nuclear Seminar
Nucleosynthesis in Type I X-ray Bursts: Exploring the αρ-Process through High Precision (ρ,t) Measurements
Friday
January 22
3-4pm
Mr. Alexander Long
University of Notre Dame
Direct Measurements of the 23Na(ρ,γ)24Mg Cross Section Underground at LUNA January 25 Mr. Axel Boeltzig
Gran Sasso Science Institute
L'Aquila, Italy
(α,ρ) reaction Measurements with ANASEN February 1 Mr. Kevin Macon
Louisiana State University
Examining nuclear shell structure effects on isoscalar giant monopole resonance and nuclear incompressibility near A~90 February 8 Dr. Yogesh Gupta
University of Notre Dame
TBA February 15 Ms. Stephanie Lyons
University of Notre Dame
TBA February 22 Dr. Alexander Voinov
Ohio University

February 29
Spring Break March 7
TBA March 14 Dr. Sean Liddick
NSCL, MSU

March 21
Easter March 28

April 4

April 11
TBA April 18 Prof. Dieter Frekers
University of Münster, Germany
TBA April 25 Dr. Xilin Zhang
University of Washington
TBA May 2 Dr. Dawn Shaughnessy
Livermore National Laboratory
TBA May 9 Prof. Nadia Fomin
University of Tennessee








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