Thu·Sep 23, 2021Thursday·September 23, 2021

1. 01*

   Mass measurements of 99-101In challenge ab initio nuclear theory of the nuclide 100Sn

   M. Mougeot🇨🇭 · D. Atanasov🇨🇭 · J. Karthein🇩🇪 · R. N. Wolf🇦🇺 · P. Ascher🇫🇷 · K. Blaum🇩🇪 · K. Chrysalidis🇨🇭 · G. Hagen🇺🇸 · J.D. Holt🇨🇦 · W.J. Huang🇩🇪 · G.R. Jasen🇺🇸 · I. Kulikov🇩🇪 and 14 other authors

   100Sn is of singular interest for nuclear structure. Its closed-shell proton and neutron configuration exhibit exceptional binding and 100Sn is the heaviest nucleus comprising protons and neutrons in equal number, a feature that enhances the contribution of the short-range, proton-neutron pairing interaction and strongly influences its decay via the weak interaction. Decays studies in the region of 100Sn have attempted to prove its doubly magic character but few have studied it from the ab initio theoretical perspective and none have addressed the odd-proton nuclear forces. Here we present, the first direct measurement of the exotic odd-proton nuclide 100In - the beta-decay daughter of 100Sn - and 99In, only one proton below 100Sn. The most advanced mass spectrometry techniques were used to measure 99In, produced at a rate of only a few ions per second, and to resolve the ground and isomeric states in 101In. The experimental results are confronted with new ab initio many-body approaches. The 100-fold improvement in precision of the 100In mass value exarcebates a striking discrepancy in the atomic mass values of 100Sn deduced from recent beta-decay results.

   nucl-exnucl-thNat.Phys.(2021)·60 citations
2. 02*

   Nuclear charge radii of Na isotopes: A tale of two theories

   B. Ohayon🇨🇭 · R.F. Garcia Ruiz🇺🇸 · Z. H. Sun🇺🇸 · G. Hagen🇺🇸 · T. Papenbrock🇺🇸 · B. K. Sahoo🇮🇳

   The accuracy of atomic theory calculations limits the extraction of nuclear charge radii from isotope shift measurements of odd-proton nuclei. For Na isotopes, though precise spectroscopic measurements have existed since more than half a century, calculations by different methods offer a wide range of values. Here, we present accurate atomic calculations to reliably extract the Na charge radii. By combining experimental matter radii with nuclear coupled-cluster calculations based on nucleon-nucleon and three-nucleon forces, we constrain the parameters obtained from the atomic calculations. Therefore, this study guides atomic theory and highlights the importance of using accurate atomic and nuclear computations in our understanding of the size of light nuclei.

   ↳ physics.atom-phnucl-exnucl-thPRC(2022)·26 citations
3. 03*

   Combining Halo-EFT descriptions of nuclei and precise models of nuclear reactions

   Pierre Capel🇧🇪

   The clear separation of scales observed in halo nuclei between the extended halo and the compact core makes these exotic nuclei a perfect subject for Effective Field Theory (EFT). Such description leads to a systematic expansion of the core-halo Hamiltonian, which naturally orders the nuclear-structure observables. In this short review, I show the advantage there is to include Halo-EFT descriptions within precise models of reactions. It helps identifying the nuclear-structure observables that matter in the description of the reactions, and enables us to easily bridge predictions of nuclear-structure calculations to reaction observables. I illustrate this on breakup, transfer and knockout reactions with 11Be, the archetypical one-neutron halo nucleus.

   ↳ nucl-thnucl-exFew Body Syst.(2022)·5 citations
4. 04*

   A commercial embedded board as DAQ in nuclear physics

   Madalin Ilie Cherciu · Ciprian Mitu · Ioana Ion

   The aim of this work is to test the capacity of a low cost but powerful device to be used in gamma spectrometry. The IZIRUNF0 [1] is an embedded STM32 board device with an ARM Cortex-M0 microcontroller build in. The possibilities offered by the configuration (direct memory access controller (DMA) acquisition through circular buffer, 12-bit analog to digital converter (ADC), analog watchdog for threshold on ADC, embedded data acquisition, etc.) make it interesting to be used within an autonomous compact particle spectrometry system. Therefore, we have tested it for a pulse like shape (15 {\mu}s wide) at different frequency, as well as the response from a gamma source Cs137 on a CsI(Tl) scintillator coupled to a photodiode detector. The data were offline processed using our PYTHON [2] developed program [3].

   ↳ physics.ins-detnucl-ex0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.