Bulletin of the American Physical Society
2011 Fall Meeting of the APS Division of Nuclear Physics
Volume 56, Number 12
Wednesday–Saturday, October 26–29, 2011; East Lansing, Michigan
Session GB: Exotic Correlated Decays |
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Chair: Brad Sherrill, Michigan State University Room: Auditorium |
Friday, October 28, 2011 8:30AM - 9:06AM |
GB.00001: Multiple proton decays of $^{6}$Be, $^{8}$C, $^{8}$B(IAS) and excited states in $^{10}$C Invited Speaker: Lee Sobotka Recent technical advances have allowed for high-order correlation experiments to be done. We have primarily focused on experiments in which the final channels are composed of only alphas and protons. Four cases we have studied are: $^{6}$Be, $^{10}$C*, $^{8}$C, and $^{8}$B*(IAS) via 3, 4, 5, and 3-particle correlation measurements, respectively. While the first case had been studied before, our work presents very high statistics in the full Jacobi coordinates (the coordinates needed to describe 3-body decay.) Our study of $^{10}$C excited states provides isolatable examples of: correlated 2p decay, from one state, and the decay of another which is unusually highly correlated, a ``m\'{e}nage a quatre.'' $^{8}$C decay presents the only case of sequential 3-body 2p decay steps (i.e. 2p-2p.) The intermediate in this 2-step process is the first example ($^{6}$Be) mentioned above. Unlike the well-studied second step ($^{6}$Be decay), the first step in this 2p-2p process provides another example of correlated 2p emission. The decay of $^{8}$B(IAS), the isobaric analog of $^{8}$C, also decays overwhelmingly by 2p emission, in this case to $^{6}$Li(IAS). This IAS-to-IAS 2p decay is one for which decay to the potential 1p intermediates is energetically allowed but isospin forbidden. This represents an expansion, over that originally envisioned by Goldanski, of the conceivable nuclear territory for 2p decay. [Preview Abstract] |
Friday, October 28, 2011 9:06AM - 9:42AM |
GB.00002: Two-proton radioactivity of $^{48}$Ni Invited Speaker: Krzysztof Miernik In experiment performed at NSCL facility we studied the decay of extremely neutron deficient isotope of $^{48}$Ni. Ions were implanted into a gaseuos detector, the Optical Time Projection Chamber which allows to record tracks of charged particles. Six events of $^{48}$Ni were observed, the two-proton radioactivity (four events) and the $\beta$--decay (two events) channels were clearly indentified. The half--life of $^{48}$Ni is determined to be $T_{1/2}$ = 2.1$^{+1.4}_{-0.4}$ ms. The results of three--dimensional events reconstruction as well as comparison of results with theoretical models will be presented. [Preview Abstract] |
Friday, October 28, 2011 9:42AM - 10:18AM |
GB.00003: Shell Model with coupling to the continuum for weakly-bound and unbound nuclei Invited Speaker: Jimmy Rotureau A lot of progress have recently been made in the development of radioactive beams and remote parts of the nuclear chart which were previously out of reach experimentally can now be explored. The nuclei located in these regions i.e. in the vicinity or beyond the neutron (proton) drip-line have very different properties from the well-bound systems in the valley of stability. The presence of weakly-bound states, halo structures and strong coupling to the continuum are typical features of these exotic nuclei and require new theories to describe them. During my talk, I will present two models based on the shell model formalism in which the coupling with the continuum is taken into account to describe nuclei in these remote regions. These models are the Shell Model Embedded with the Continuum (SMEC) and the Gamow Shell Model (GSM). I will present the main ideas of these models and show results for the two-proton radioactivity as well as a description of light nuclei close to the neutron drip-line. [Preview Abstract] |
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