Wed·Sep 20, 2023Wednesday·September 20, 2023

1. 01*

   Status of experimental knowledge on the unbound nucleus ${}^{13}$Be

   K.L. Jones · J. Kovoor · R. Kanungo🇨🇦

   The structure of the unbound nucleus ${}^{13}$Be is important to understanding the Borromean, two-neutron halo nucleus ${}^{14}$Be. The experimental studies conducted over the last four decades are reviewed in the context of the beryllium chain of isotopes and some significant theoretical studies. One focus of this paper is the comparison of new data from a ${}^{12}$Be(d,p) reaction in inverse kinematics, which was analyzed using GEANT4 simulations and a Bayesian fitting procedure, with previous measurements. Two possible scenarios to explain the strength below 1~MeV above the neutron separation energy were proposed in that study: a single $p$-wave resonance, or a mixture of an $s$-wave virtual state with a weaker either $p$-wave or $d$-wave resonance. Comparisons of recent invariant mass and the (d,p) experiments show good agreement between the transfer measurement and the two most recent high-energy nucleon removal measurements.

   nucl-exnucl-thFront.in Phys.(2023)·2 citations
2. 02*

   K Isomers in Transuranium Nuclei

   Fritz Peter Heßberger🇩🇪

   K isomers in transuranium nuclei have become a most interesting subject in nuclear structure investigation in many laboratories within the recent twenty years. In this paper an overview on the present day situation will be given. It will focus on the conditions for occuring of this kind of isomers, their decay properties and systematics in their properties as far as experimental data are available.

   nucl-exnucl-th7 citations
3. 03*

   Visualizing quantum coherence and decoherence in nuclear reactions

   K. Hagino🇯🇵 · T. Yoda

   Differential cross sections of nuclear reactions often exhibit characteristic oscillations in the angular distribution originated from an interference of two indistinguishable processes. Here we propose a novel method to visualize origins of such oscillations. This is achieved by taking Fourier transform of scattering amplitudes, following the idea in wave optics. We apply this method to elastic scattering of ${}^{16}$O+${}^{16}$O and ${}^{18}$O+${}^{18}$O at energies above the Coulomb barrier. The former system shows strong oscillations in the angular distribution due to the nearside-farside interferences, while the oscillations are largely suppressed in the latter system due to a stronger absorption. We show that the image of the former and the latter systems corresponds to a double-slit and a single-slit problems in quantum mechanics, respectively.

   ↳ nucl-thhep-phhep-thnucl-exPLB(2024)·5 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.