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SUMMARY:RNC–KEK Joint Seminars：The 347h and The 348th RIBF Nuclear Phy
 sics Seminars
DTSTART:20260702T043000Z
DTEND:20260702T073000Z
DTSTAMP:20260707T124500Z
UID:indico-event-5644@indico2.riken.jp
DESCRIPTION:Speakers: Andrei Andreyev (University of York)\, James Cubiss 
 (The Univeristy of Edinburgh)\n\n【347th】Talk given by Dr. James Cubiss
 \, The University of EdinburghTitle: Shifts\, Shapes and Shells studied by
  In-Source Laser Spectroscopy at ISOLDEAbstract:Laser spectroscopy is a po
 werful technique for studying how ground and isomeric state properties acr
 oss the chart of nuclides [1]. From the measuring isotope shifts and hyper
 fine structures we can deduce nuclear spins\, changes in mean-squared char
 ge radii and electromagnetic moments. Such data are excellent tests for th
 eory\, providing wide-ranging benchmarks to compare model predictions to [
 2].\nI will introduce the in-source resonance ionisation technique used at
  CERN’s ISOLDE facility [3] – a highly efficient method\, which when c
 ombined with the sensitivity of decay stations [4] or mass spectrometry de
 vices [5]\, allows access to exotic nuclides with extremely low production
  rates. Results will be presented from recent campaigns in the neutron-ric
 h Pb (Z=82) region\, where the impact of the N=126 closure on nuclear prop
 erties\, such as the “kink” in charge radii\, have been explored [6\,7
 ].[1] X. F. Yang\, S. J. Wang\, S. G. Wilkins\, R. F. Garcia Ruiz\, Prog. 
 Part. Nucl. Phys. 129\, 104005 (2023).[2] A. R. Vernon et al.\, Nature 607
 \, 260-265 (2022).[3] M. J. Borge\, B. Jonson\, J. Phys. G: Nucl. Part. Ph
 ys. 44\, 044011 (2017).[4] A. N. Andreyev et al.\, Phys. Rev. Lett. 105\, 
 252502 (2010).[5] R. N. Wolf et al.\, Int. J. Mass Spectrom. 349-350\, 123
 -133 (2013).[6] Z. Yue et al.\, Phys. Lett. B 849\, 138452 (2024)[7] Z. Yu
 e et al.\, Phys. Rev. C 110\, 034315 (2024).【348th】Talk given by Prof.
  Andrei Andreyev\, the University of YorkTitle: Approaching the dominance 
 of electron-capture delayed fission in 234Bk and 230AmAbstract:The beta-de
 layed fission is believed to play an important role in the so-called ‘fi
 ssion termination’ of the astrophysical r-process\, together with sponta
 neous and neutron-induced fission. However\, its properties are very diffi
 cult for investigations\, due to the experimental problems to reach releva
 nt regions of nuclei\, with only about 25 cases of beta-delayed fission kn
 own so far\, predominantly for the neutron-deficient nuclides [1].\nThe ta
 lk will present the result of an experiment to study electron-capture dela
 yed fission (ECDF) in the very neutron-deficient isotope 234Bk\, performed
  at the gas-filled recoil separator SHANS2 at the Institute for Modern Phy
 sics\, IMP-Lanzhou\, China.  The isotope 234Bk was produced in the fusion
 -evaporation reaction 40Ar+197Au->237Bk*->234Bk+3n.\nBy using the method o
 f temporal and position correlations\, different decay channels of 234Bk a
 nd its alpha-decay product 230Am were investigated and a wealth of new exp
 erimental information was obtained. The data significantly improve over th
 e previous investigations at the GARIS gas-filled separator [2\,3].\nThe h
 ighest ECDF probabilities\, PECDF(234Bk)=0.57(11) and PECDF(230Am)=0.34(9)
 \, among all beta- or EC-delayed fission cases known so far are reported\,
  showing the tendency of approaching the expected saturation towards PECDF
  =1 [4]. The comparison of the PECDF systematics with two theoretical fiss
 ion models shows significant discrepancies in respect of corresponding fis
 sion barrier values. The need for a theoretical framework that can provide
  realistic beta-delayed fission probabilities for astrophysical prediction
 s is strongly underlined.[1] A.N. Andreyev\, M. Huyse\, Piet Van Duppen\, 
 Reviews of Modern Physics 85 (4)\, 1541 (2013) [2] D. Kaji et al.\, Journa
 l of the Physical Society of Japan 85\, 015002 (2016).[3] G. L. Wilson et 
 al.\, Physical Review C 96\, 044315 (2017).[4] Z. Zhang et al\, submitted\
 , March 2026\nZoom Link: Zoom link:  https://riken-jp.zoom.us/j/965779676
 79?pwd=YmgrOW9pTmNhUkIvODFycEdRSUpuQT09\n\nhttps://indico2.riken.jp/event/
 5644/
LOCATION:RIBF Hall\, RIBF 2nd Floor (Wako\, Saitama)
URL:https://indico2.riken.jp/event/5644/
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