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SUMMARY:Mass measurements of N = 50 isotones and its implications in the n
 uclear structure around 100Sn
DTSTART;VALUE=DATE-TIME:20240530T155000Z
DTEND;VALUE=DATE-TIME:20240530T161000Z
DTSTAMP;VALUE=DATE-TIME:20260712T235234Z
UID:indico-contribution-23092@indico.ific.uv.es
DESCRIPTION:Speakers: Samuel Ayet San Andrés (Instituto de Física Corpus
 cular - CSIC UV)\nMass spectrometry is invaluable for probing the essentia
 l characteristics of nuclei\, particularly their binding energy. The FRS I
 on Catcher at GSI employs a Multiple-Reflection Time-of-Flight Mass Spectr
 ometer (MR-TOF-MS) to achieve precise\, fast\, and sensitive mass measurem
 ents\, crucial for studying exotic nuclei far from stability. Previous inv
 estigations\, have scrutinized properties of nuclei surrounding the heavie
 st N=Z double-magic nucleus\, $^{100}$Sn [Horn]\, revealing discrepancies 
 in properties like $Q_{ec}$ and production cross-sections [Hinke\, Lubos].
 \nThe stability of nuclei along the N=Z line persists up to $^{40}$Ca (N=Z
 =20)\, beyond which\, instability prevails. This increasing divergence fro
 m stability poses challenges for both production and measurement technique
 s in reaching the heaviest N=Z nuclei. In a recent study it was possible t
 o determine the mass value of $^{100}$In\, based on this and trends in the
  shifted two-neutron separation energy\, the older $Q_{ec}$ value for $^{1
 00}$Sn is favoured [Moug]. In the study that will be presented\, mass meas
 urements of isotones along the N=50 line (44$\\leq$Z$\\leq$48) approaching
  $^{100}$Sn were conducted\, yielding measurements for 14 ground and two i
 someric states [Moll].\nThe excitation energy of the long-lived isomer in 
 $^{94}$Rh was determined for the first time and together with shell model 
 calculations allowed a spin-parity assignment of the observed states.\nFir
 st direct mass measurement of $^{98}$Cd provided a much more accurate and 
 trustful $Q_{ec}$ value than previous mass measurement methods. Systematic
  investigations of the shifted two-neutron shell-gap\, utilizing the newly
  acquired masses were performed\, confirming the results of the previous s
 tudy\, favouring specific $Q_{ec}$ values [Hinke]. Moreover\, the $Q_{ec}$
  value obtained for $^{98}$Cd was also employed to analyze the Gamow-Telle
 r (GT) strength trend along the N=50 isotones\, which also has been compar
 ed to new state-of-the art calculations utilizing a large-scale shell mode
 l (LSSM). This results strongly support the newer $Q_{ec}$ values measured
  for $^{100}$Sn [Lubos].\n\n\n[Moll] A. Mollaebrahimi et al.\, Phys. Lett.
  B 839 (2023) 137833\n[Moug] Mougeot et al.\, Nat. Phys. 17\, 1099–1103 
 (2021).\n[Horn] C. Hornung et al.\, Phys. Lett. B 802 (2020) 135200\n[Hink
 e] C.B. Hinke\, et al.\, Nature 486 (2012) 341.\n[Lubos] D. Lubos\, et al.
 \, Phys. Rev. Lett. 122 (2019) 222502.\n\nhttps://indico.ific.uv.es/event/
 7332/contributions/23092/
LOCATION:ADEIT - Valencia
URL:https://indico.ific.uv.es/event/7332/contributions/23092/
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