Bulletin of the American Physical Society
2016 Fall Meeting of the APS Division of Nuclear Physics
Volume 61, Number 13
Thursday–Sunday, October 13–16, 2016; Vancouver, BC, Canada
Session NB: Recent Insights on Shell Evolution in NucleiInvited
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Sponsoring Units: DNP Chair: Jason Holt, TRIUMF Room: Pavilion Ballroom D |
Sunday, October 16, 2016 8:30AM - 9:06AM |
NB.00001: ABSTRACT WITHDRAWN |
Sunday, October 16, 2016 9:06AM - 9:42AM |
NB.00002: Electromagnetic moments and radii near N $=$32,34 Invited Speaker: Ronald Fernando Garcia Ruiz On behalf of the COLLAPS and CRIS collaborations at ISOLDE-CERN. \\Nuclei in the neighborhood of calcium isotopes play a key role in the development of many-body methods and provide an important test for current descriptions of the nuclear force. The properties of stable nuclei in the vicinity of the two naturally occurring doubly-magic calcium ($Z=$20) isotopes, $^{\mathrm{40}}$Ca ($N=$20) and $^{\mathrm{48}}$Ca ($N=$28), have been extensively studied, both experimentally and theoretically. Recently, special attention has been given to the evolution of nuclear structure in exotic neutron-rich isotopes beyond $N=$28, where evidence of doubly-magic features have been reported at $N=$32 [1] and $N=$34 [2]. This contribution presents the latest results obtained with laser spectroscopy in the region. Measurements of the hyperfine structure spectra and isotope shifts for the potassium ($Z=$19) and calcium ($Z=$20) isotopic chains were obtained by using optical detection at COLLAPS, ISOLDE-CERN. From these measurements, our knowledge of nuclear ground-state spins, ground-state electromagnetic moments and changes in the root-mean-squared charge radii has been extended up to $N=$32 [3-7].\newline With relatively low production yields, the isotopes $^{\mathrm{51}}$K (\textasciitilde 4000 ions/s) and$^{\mathrm{\thinspace \thinspace 52}}$Ca (\textasciitilde 250 ions/s) are at the limit of optical detection techniques. In order to extend laser spectroscopy studies further away from stability, a highly sensitive experimental setup has been developed at the COLLAPS beam line [8,9]. The current developments in this direction and the perspectives for future experiments using collinear resonance ionization spectroscopy (CRIS) [10,11] in the region towards $N=$34 will be discussed.\newline [1] F. Wienholtz \textit{et al.,} \textit{Nature} 498, 346 (2013). [2] D. Steppenbeck \textit{et al.,} \textit{Nature} 502, 207 (2013). [3] J. Papuga \textit{et al. } Phys. Rev. Lett. 119, 172503 (2013). [4] M. Bissell \textit{et al.,} Phys. Rev. Lett. 90, 034321 (2014). [5] K. Kreim \textit{et al. }Phys. Lett. B 731, 97 (2014). [6] R.F. Garcia Ruiz \textit{et al.,} \textit{Phys. Rev. C }91, 041304(R) (20015). [7] R.F. Garcia Ruiz \textit{et al.,}~\textit{Nature Physics} 12, 594 (2016). [8] L. Vermeeren, \textit{et al.,} \textit{Phys. Rev. Lett.} 68, 1679 (1992). [9] R. F. Garcia Ruiz~~\textit{et al.} \textit{In preparation}~(2016). [10] K. T. Flanagan \textit{et al.,} Phys. Rev. Lett. 111, 212501 (2013). [11] R. P. De Groote \textit{et al}., Phys. Rev. Lett. 115, 132501 (2015). [Preview Abstract] |
Sunday, October 16, 2016 9:42AM - 10:18AM |
NB.00003: Coupled cluster calculations of neutron-rich nuclei Invited Speaker: Gaute Hagen In this talk I will present recent highlights from ab initio computations of atomic nuclei using coupled-cluster methods with state-of-the-art interactions from chiral effective field theory (EFT). The recent progress in computing nuclei from scratch is based on new optimizations of interactions from chiral EFT, and ab initio methods with a polynomial computational cost together with available super computing resources. The physics advancements I will discuss include: (i) accurate nuclear binding energies and radii of light and medium-mass nuclei, (ii) the neutron distribution and electric dipole polarizability of the nucleus $^{\mathrm{48}}$Ca, (iii) and the structure of the rare nucleus $^{\mathrm{78}}$Ni from first principles. All these quantities are currently targeted by precision measurements worldwide. [Preview Abstract] |
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