Bulletin of the American Physical Society
APS April Meeting 2014
Volume 59, Number 5
Saturday–Tuesday, April 5–8, 2014; Savannah, Georgia
Session R3: Invited Session: Quadropole Collectivity and Shape Coexistence around A=100
10:45 AM–12:33 PM,
Monday, April 7, 2014
Room: Chatham Ballroom B
Sponsoring Unit: DNP
Chair: Sam Tabor, Florida State University
Abstract ID: BAPS.2014.APR.R3.3
Abstract: R3.00003 : Inelastic proton scattering of Sn isotopes studied with GRETINA*
11:57 AM–12:33 PM
Preview Abstract Abstract
(Lawrence Berkeley National Laboratory)
The chain of semi-magic Sn nuclei, with many stable isotopes, has been a fertile ground for experimental and theoretical studies. Encompassing a major neutron shell from N$=$50 to 82, the properties and structure of these nuclei provided important data for the development of the pairing-plus-quadrupole model. Recent experimental information on B(E2) for 106,108,110,112Sn came as a surprise as it indicated a larger collectivity than the predicted parabolic trend of quadrupole collectivity. These data, instead, show an unexpectedly flat trend even as the number of valence particles is reduced from 12 to 6. To fully understand how collectivity is evolving in these isotopes, 108,110,112Sn have been studied using thick-target, inelastic proton scattering with GRETINA tagging inelastic scattering events by detecting gamma-rays from the prompt decay of states excited in the reaction. We will present the trend of 2$+$ excitation cross-sections, the deduced quadrupole deformation parameters, and observations of other low-lying collective states. Comparison of these (p,p') quadrupole deformation parameters with B(E2) data will provide new insights into the relative importance of proton and neutron contributions to collectivity in these nuclei.
*GRETINA was funded by the US DOE - Office of Science. Operation of the array at NSCL is supported by NSF under Cooperative Agreement PHY-1102511(NSCL) and DOE under grant DE-AC02-05CH11231(LBNL).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.APR.R3.3
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