Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session QF: Nuclear Structure: Heavy Nuclei II |
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Chair: Claus Muller-Gatermann, ANL Room: Berkeley & Clarendon |
Thursday, October 14, 2021 11:30AM - 11:42AM |
QF.00001: Abstract Withdrawn
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Thursday, October 14, 2021 11:42AM - 11:54AM |
QF.00002: Angular Correlation and Polarization Measurements in 214Po using GRETINA Sophia R Balderrama, Elizabeth McCutchan, Shaofei Zhu, Dirk W Weisshaar, Jing Li Nuclei in the neutron-rich region around 208Pb offer a perfect testing ground for realistic shell model interactions, yet experimental data becomes increasingly sparse moving east from the closed shell. The decay of 226Ra offers a simple way to study several neutron-rich A=214 nuclei which are populated in β decays along the decay chain. To study the decay of 214Bi into 214Po, we use GRETINA at NSCL, MSU to assay a source of 226Ra. Despite being a very well studied nucleus, we identify several new transitions and levels populated in the decay. In addition, we performed γ-γ angular correlation and polarization measurements to make definite spin/parity assignments. A revised level scheme will be presented and compared to current shell model calculations. |
Thursday, October 14, 2021 11:54AM - 12:06PM |
QF.00003: Charge radii in covariant density functional theory: a global view Udeshika C Perera, Anatoli Afanasjev, Peter Ring A systematic global investigation of differential charge radii has been performed within the covariant density functional theory |
Thursday, October 14, 2021 12:06PM - 12:18PM |
QF.00004: Fast neutron scattering and multiple-neutrion detection in MoNA Warren F Rogers, Andrea Munroe, Jeremy E Hallett With the new FRIB facility coming online soon, studies of neutron-unbound systems near the neutron dripline will have |
Thursday, October 14, 2021 12:18PM - 12:30PM |
QF.00005: Determination of beta-decay intensities of 107Mo using the Modular Total Absorption Spectrometer (MTAS) Peng Shuai, Charlie C Rasco, Krzysztof Rykaczewski, Alexander M Laminack Pandemonium effect is a potential systematic bias of beta feeding intensities in the decay measurements with high-resolution but low-efficiency detectors. This leads to the misinterpretation of the feeding intensities to high excited levels as to low-lying levels. Modular Total Absorption Spectrometer (MTAS), which has almost 99% gamma detection efficiency, is an ideal spectrometer to determine the true beta feeding intensities free from Pandemonium effect. |
Thursday, October 14, 2021 12:30PM - 12:42PM |
QF.00006: Abstract Withdrawn
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Thursday, October 14, 2021 12:42PM - 12:54PM |
QF.00007: Measuring the 134Xe(d,pγ)135Xe Reaction with Goddess to Probe Single-Neutron Excitations in 135Xe Chad C Ummel, Alexandre A Lepailleur, Gwenaelle Seymour, Jolie A Cizewski, Kate L Jones, Steven D Pain, Andrew Ratkiewicz, Heather I Garland, Harrison E Sims The single-particle energy spectra of nuclei near shell closures provide important inputs for the nuclear shell model. 135Xe (Z=54, N=81) lies just below the N=82 shell gap, and as such, single-neutron excitations above the shell gap can be studied using neutron-transfer reactions, such as (d,p), on 134Xe. In order to study these states in 135Xe and their gamma decays, the 134Xe(d,pγ)135Xe reaction was performed in inverse kinematics with GODDESS (Gammasphere-ORRUBA: Dual Detectors for Experimental Structure Studies) at ATLAS, using a 134Xe beam impinged on a C2D4 target. The coincident detection of reaction protons and gamma rays enabled identification of excited levels and their gamma decays. Spin-parities can be constrained by measuring reaction proton angular distributions with the position-sensitive ORRUBA silicon detectors. Candidates for f-p configurations above the N=82 shell gap have been observed for the first time; preliminary results will be presented. |
Thursday, October 14, 2021 12:54PM - 1:06PM |
QF.00008: The decay of indium-133 at ISOLDE decay station Zhengyu Xu, Miguel Madurga, Robert Grzywacz, Thomas T King, Joseph Heideman, Maninder Singh, Rin Yokoyama In this contribution, I will present an experimental work studying the beta decays of 133In at the ISOLDE decay station (IDS). Uniquely to r-process nuclei, nuclear beta decay with extreme neutron excess involves neutrons and protons in different major shells of opposite parity, dividing the decay strength between forbidden, at low energies, and Gamow-Teller (GT) transitions, mostly above neutron separation energies [1]. The new neutron time-of-flight array, INDIe [2-4], was installed at IDS to investigate the neutron unbound states in 133Sn populated in the beta decay of 133In. Several strong transitions were observed below Ex=6 MeV, including the previously observed state at Ex=3.56 MeV [5-7]. This observation allows us to quantify with high precision the strength distribution of the GT and FF transitions in the region to the southeast of 132Sn. In addition, we were able to map decay strength up to about 10 MeV excitation energy in 133Sn, which is crucial to quantify multi-neutron emission probabilities in this region. Our experimental findings were compared to the theoretical predictions. We carried out large-scale shell-model calculations involving several different effective nucleon-nucleon potentials. The results of these calculations will also be discussed. |
Thursday, October 14, 2021 1:06PM - 1:18PM |
QF.00009: 233U(n, γ) measurements at LANSCE Esther L Leal-Cidoncha The Th-U fuel cycle, in which the 233U plays an important role, has been proposed as an |
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