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On-line installation of the Superallowed Transition Beta-Neutrino Decay Ion Coincidence Trap

https://doi.org/10.1051/epjconf/202430102002

Brodeur, M; Bardayan, DW; Bruce, O; Bualuan, R; Burdette, DP; Clark, JA; Gallant, AT; Gan, D; Guillet, D; Houff, AM; et al (January 2024, EPJ Web of Conferences)
Bijker, R; Marín_Lámbarri, DJ; Yépez_Martínez, TC (Ed.)
The Cabibbo-Kobayashi-Maskawa quark mixing matrix currently does not satisfy unitarity at the 2σ-level. This could be the result of an inaccurate value of one or both of its largest matrix elementsV_usandV_ud. In the case ofV_ud, the most precise measurement is obtained from thef t-value measurements of superallowed beta-transitions between 0⁺states. The accuracy of this determination can, in turn, be tested by extractingV_udin other transitions including superallowed transitions between mirror nuclei. The Superallowed Transition Beta-Neutrino Decay Ion Coincidence Trap (St. Benedict) is currently under construction at the Nuclear Science Laboratory of the University of Notre Dame to perform such a determination, with the goal of shedding more light on this tension with unitarity. St. Benedict will take a radioactive ion beam produced byTwinSol, thermalize it in a large volume gas catcher, then transport it in two separate differentially-pumped volumes using a radio-frequency (RF) carpet and a radio-frequency quadrupole (RFQ) ion guide before injecting it in an RFQ trap to create cool ion bunches for injection in the measurement Paul trap. In this paper, we detail the installation of the beam preparation components of St. Benedict, and present the results of the first RIBs successfully stopped and extracted from its gas catcher.
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Construction of St. Benedict

https://doi.org/10.1016/j.nimb.2023.05.024

Brodeur, M.; Ahn, T.; Bardayan, D.W.; Burdette, D.P.; Clark, J.A.; Gallant, A.T.; Kolata, J.J.; Liu, B.; O’Malley, P.D.; Porter, W.S.; et al (August 2023, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms)

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Nuclear physics with TriSol at Notre Dame’s Nuclear Science Laboratory

https://doi.org/10.1016/j.nimb.2023.05.006

Ahn, T.; Bardayan, D.W.; Blankstein, D.; Boomershine, C.; Brodeur, M.; Carmichael, S.; Coil, S.; Kolata, J.J.; O’Malley, P.D.; Porter, W.; et al (August 2023, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms)

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The Beta-decay Paul Trap Mk IV: Design and commissioning

https://doi.org/10.1016/j.nima.2023.168818

Varriano, L.; Savard, G.; Clark, J.A.; Burdette, D.P.; Burkey, M.T.; Gallant, A.T.; Hirsh, T.Y.; Longfellow, B.; Scielzo, N.D.; Segel, R.; et al (January 2024, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment)

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Experimental study of ⁶ He Coulomb breakup as an indirect measurement of ⁴ He(2n, γ ) ⁶ He reaction rate for the astrophysical r-process

https://doi.org/10.1051/epjconf/202430402003

Godos, D; Acosta, L; Fernández-García, J P; O’Malley, P; Sánchez-Benítez, A M; Di_Pietro, A; Tumino, A; Vicente, A; Boomershine, C; Dembski, C; et al (January 2024, EPJ Web of Conferences)
Pakou, A; Souliotis, G; Moustakidis, C (Ed.)
In this work, we report the measurement of elastic and Coulomb break-up channels in⁶He+²⁰⁸Pb collisions at E_lab= 19.3 MeV, close to the Coulomb barrier of this system ∼ 19 MeV. In the context of the astrophysical r-process, the reaction⁴He(2n,γ)⁶He has been proposed to be a key reaction in the path of synthesizing seed nuclei for the r-process, as¹²C, in an environment composed mainly of alpha particles and neutrons. Based on a theoretical approach for treating three body reactions by means of which its reaction rate can be inferred, our experimental approach aims to obtain an indirect measurement of the reaction rate of⁴He(2n,γ)⁶He by measuring the Coulomb breakup of⁶He under the intense electric field produced by a²⁰⁸Pb target nucleus. The experiment was carried out at the TriSol facility operated in the Nuclear Science Laboratory of the University of Notre Dame, USA, which delivered a⁶He beam together with other contaminants. Particular care must be taken for the alpha particles produced in the production reaction.
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Precision half-life determination for the $β^{+}$ emitter ${}^{13}N$

https://doi.org/10.1103/PhysRevC.106.045501

Long, J.; Nicoloff, C. R.; Bardayan, D. W.; Becchetti, F. D.; Blankstein, D.; Boomershine, C.; Burdette, D. P.; Caprio, M. A.; Caves, L.; Fasano, P. J.; et al (October 2022, Physical Review C)

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