Mon·Jan 31, 2022Monday·January 31, 2022

1. 01*

   The SIDDHARTA-2 calibration method for high precision kaonic atoms X-ray spectroscopy measurements

   F Sgaramella🇮🇹 · M Miliucci🇮🇹 · M Bazzi🇮🇹 · D Bosnar🇭🇷 · M Bragadireanu🇷🇴 · M Carminati🇮🇹 · M Cargnelli🇦🇹 · A Clozza🇮🇹 · G Deda🇮🇹 · L De Paolis🇮🇹 · R Del Grande🇮🇹 · C Fiorini🇮🇹 and 20 other authors

   The SIDDHARTA-2 experiment at the DA$\Phi$NE collider aims to perform the first kaonic deuterium X-ray transitions to the fundamental level measurement, with a systematic error at the level of a few eV. To achieve this challenging goal the experimental apparatus is equipped with 384 Silicon Drift Detectors (SDDs) distributed around its cryogenic gaseous target. The SDDs developed by the SIDDHARTA-2 collaboration are suitable for high precision kaonic atoms spectroscopy, thanks to their high energy and time resolutions combined with their radiation hardness. The energy response of each detector must be calibrated and monitored to keep the systematic error, due to processes such as gain fluctuations, at the level of 2-3 eV. This paper presents the SIDDHARTA-2 calibration method which was optimized during the preliminary phase of the experiment in the real background conditions of the DA$\Phi$NE collider, which is a fundamental tool to guarantee the high precision spectroscopic performances of the system over long periods of data taking, as that required for the kaonic deuterium measurement.

   ↳ physics.ins-detnucl-exPhys.Scripta(2022)·27 citations
2. 02*

   The Sturdiness of the Shell Model: Informal Review

   Castaly Fan · Larry Zamick🇺🇸

   With shell model codes being able to encompassing larger and larger spaces we find that the percentage occupancy of the leading spaces becomes smaller and smaller. How can the shell model survive in such circumstances? We will not solve this puzzle here but rather will show examples where, with some explanations, the shell model holds fast. We will use nuclear moments as an example.

   ↳ nucl-thnucl-ex0 citations
3. 03*

   In-flight production of an isomeric beam of ${}^{16}$N

   C. R. Hoffman🇺🇸 · T. L. Tang🇺🇸 · M. Avila · Y. Ayyad🇪🇸 · K. W. Brown · J. Chen · K. A. Chipps🇺🇸 · H. Jayatissa · B. P. Kay🇺🇸 · C. Müller-Gatermann🇩🇪 · H. J. Ong🇨🇳 · J. Song🇪🇸 · G. L. Wilson🇺🇸

   An in-flight beam of ${}^{16}$N was produced via the single-neutron adding ($d$,$p$) reaction in inverse kinematics at the recently upgraded Argonne Tandem Linear Accelerator System (ATLAS) in-flight system. The amount of the ${}^{16}$N beam which resided in its excited 0.120-MeV $J^{\pi }=0^{-}$ isomeric state (T${}_{1/2}\approx 5$ $\mu$s) was determined to be 40(5)% at a reaction energy of 7.9(3) MeV/$u$, and 24(2)% at a reaction energy of 13.2(2) MeV/$u$. The isomer measurements took place at an experimental station $\approx 30$ m downstream of the production target and utilized an Al beam-stopping foil and a HPGe Clover detector. Composite ${}^{16}$N beam rate determinations were made at the experimental station and the focal plane of the Argonne in-flight radioactive ion-beam separator (RAISOR) with Si $\Delta$E-E telescopes. A Distorted Wave Born Approximation (DWBA) approach was coupled with the known spectroscopic information on ${}^{16}$N in order to estimate the relative ${}^{16}$N isomer yields and composite ${}^{16}$N beam rates. In addition to the observed reaction-energy dependence of the isomer fraction, a large sensitivity to angular acceptance of the recoils was also observed.

   ↳ physics.ins-detnucl-exnucl-thNucl.Instrum.Meth.A(2022)·11 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.