High-precision mass measurements of neutron deficient silver isotopes probe the robustness of the $N$ = 50 shell closure
Zhuang Ge, Mikael Reponen, Tommi Eronen, Baishan Hu, Markus Kortelainen, Anu Kankainen, Iain Moore, Dmitrii Nesterenko, Cenxi Yuan, Olga Beliuskina, Laetitia Ca… 展开作者
Zhuang Ge, Mikael Reponen, Tommi Eronen, Baishan Hu, Markus Kortelainen, Anu Kankainen, Iain Moore, Dmitrii Nesterenko, Cenxi Yuan, Olga Beliuskina, Laetitia Cañete, Ruben de Groote, Celement Delafosse, Pierre Delahaye, Timo Dickel, Antoine de Roubin, Sarina Geldhof, Wouter Gins, Jason Holt, Marjut Hukkanen, Arthur Jaries, Ari Jokinen, Ágota Koszorús, Gabriella Kripkó-Koncz, Sonja Kujanpää, Yihua Lam, Stylianos Nikas, Alejandro Ortiz-Cortes, Heikki Penttilä, Daniel Pitman-Weymouth, Wolfgang Plaß, Ilkka Pohjalainen, Andrea Raggio, Sami Rinta-Antila, Jorge Romero, Marek Stryjczyk, Markus Vilen, Ville Virtanen, Alexandra Zadvornaya
High-precision mass measurements of exotic $^{95-97}$Ag isotopes close to the $N = Z$ line have been conducted with the JYFLTRAP double Penning trap mass spectrometer, with the silver ions produced using the recently commissioned inductively-heated hot cavity catcher laser ion source at the Ion Guide Isotope Separator On-Line facility. The atomic mass of $^{95}$Ag was directly determined for the first time. In addition, the atomic masses of $β$-decaying 2$^+$ and 8$^+$ states in $^{96}$Ag have been identified and measured for the first time, and the precision of the $^{97}$Ag mass has been improved. The newly measured masses, with a precision of $\approx$ 1 keV/c$^2$, have been used to investigate the $N =$ 50 neutron shell closure confirming it to be robust. Empirical shell-gap and pairing energies determined with the new ground-state mass data are compared with the state-of-the-art \textit{ab initio} calculations with various chiral effective field theory Hamiltonians. The precise determination of the excitation energy of the $^{96m}$Ag isomer in particular serves as a benchmark for \textit{ab initio} predictions of nuclear properties beyond the ground state, specifically for odd-odd nuclei situated in proximity to the proton dripline below $^{100}$Sn. In addition, density functional theory (DFT) calculations and configuration-interaction shell-model (CISM) calculations are compared with the experimental results. All theoretical approaches face challenges to reproduce the trend of nuclear ground-state properties in the silver isotopic chain across the $N =$50 neutron shell and toward the proton drip-line.
The electromagnetic decay of $^{250m}$No and the stability of neutron deficient Rf isotopes
IJCLab, CNRS/IN2P3 and Université Paris Saclay（法国萨克雷大学）；IPHC, CNRS/IN2P3 and Université de Strasbourg（斯特拉斯堡大学）；FLNR, JINR（杜布纳联合核研究所）；Dubna State Univerity（杜布纳国立大学）
The influence of shell effects on the fissility of neutron deficient uranium isotopes at N ~ 126
测量了22 Ne +208 Pb反应中U、Pa和Th缺中子同位素的产生截面和激发函数。对中子数为126 <= N <= 134的铀同位素的实验产生截面与用核去激统计模型计算的结果进行了比较。有示出，没有一个常用的方法引入壳效应的影响，蒸发残留物的生产截面允许复制unambigiously使用的一组实验数据。提出了在裂变通道中引入壳效应影响的简单半经验方法，并与Bi ~ U区缺中子同位素产生截面符合良好。
Exploring the statistical properties of the neutron-deficient $^{109}$In isotope with the Oslo method
University of Oslo（奥斯陆大学）；Norwegian Nuclear Research Centre（挪威核研究中心）；Technische Universität Darmstadt（达姆施塔特工业大学）；Western Michigan University（西密歇根大学）；GANIL, CEA/DRF-CNRS/IN2P3（法国国家重离子加速器和实验室（GANIL））；Université Libre de Bruxelles（布鲁塞尔自由大学）；University of California, Berkeley（加州大学伯克利分校）
Nuclear charge radii of aluminium isotopes at the proton drip line
Massachusetts Institute of Technology（麻省理工学院）；Texas A&M University（德克萨斯农工大学）；Michigan State University（密歇根州立大学）；Université Paris-Saclay（巴黎萨克雷大学）；Gaziantep Islam Science and Technology University（加济安泰普伊斯兰科学与技术大学）
High-precision ab initio calculations of nuclear binding energies: Tin isotopes from dripline to dripline
Technische Universität Darmstadt（达姆施塔特工业大学）；ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH（GSI重离子研究中心极端物质研究所EMMI）；KU Leuven, Instituut voor Kern- en Stralingsfysica（荷语鲁汶大学核与辐射物理研究所）；Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles（布鲁塞尔自由大学天体物理学与天文学研究所）；Brussels Laboratory of the Universe – BLU-ULB（布鲁塞尔宇宙实验室）；IRFU, CEA, Université Paris-Saclay（巴黎萨克雷大学CEA IRFU）；Max-Planck-Institut für Kernphysik（马克斯·普朗克核物理研究所）
Shape staggering of mid-shell mercury isotopes from in-source laser spectroscopy compared with Density Functional Theory and Monte Carlo Shell Model calculations
Laser Spectroscopy of Thulium Isotopes Near the $N=82$ Shell Closure: Nuclear Moment and Charge Radius of ${}^{152\mathrm{m}}\mathrm{Tm}$
GSI Helmholtzzentrum für Schwerionenforschung GmbH（GSI亥姆霍兹重离子研究中心有限公司）；Helmholtz-Institut Mainz（美因茨亥姆霍兹研究所）；Johannes Gutenberg-Universität Mainz（约翰内斯·古腾堡大学美因茨分校）；Technische Universität Darmstadt（达姆施塔特工业大学）；KU Leuven（鲁汶大学）；Grand Accelerateur National d’Ions Lourds（法国国家大型重离子加速器研究所）
Constraining the trend of the $N = 50$ shell gap towards $^{100}$Sn with the masses of $^{96-98}$Cd
Max-Planck-Institut für Kernphysik（马克斯·普朗克核物理研究所）；Studiecentrum voor Kernenergie SCK-CEN（比利时核能研究中心）；European Organization for Nuclear Research (CERN)（欧洲核子研究组织（欧洲核子中心））；Johannes Gutenberg-Universität Mainz（美因茨约翰内斯·古腾堡大学）；Massachusetts Institute of Technology（麻省理工学院）；Université Paris-Saclay, CNRS/IN2P3, IJCLab（巴黎萨克雷大学，法国国家科学研究中心/法国原子能和替代能源委员会，IJCLab实验室）；Institut für Physik, Universität Greifswald（格赖夫斯瓦尔德大学物理研究所）；FAIR GmbH（FAIR有限责任公司）；GSI Helmholtzzentrum für Schwerionenforschung GmbH（GSI亥姆霍兹重离子研究中心有限公司）；TRIUMF（特里厄姆福国家粒子加速器中心）；McGill University（麦吉尔大学）；Cyclotron Institute and Department of Physics and Astronomy, Texas A&M University（德克萨斯农工大学回旋加速器研究所及物理与天文学系）
