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SUMMARY:First full β-strength measurement with DTAS across N=126 at FAIR 
 PHASE-0
DTSTART;VALUE=DATE-TIME:20251119T150000Z
DTEND;VALUE=DATE-TIME:20251119T151500Z
DTSTAMP;VALUE=DATE-TIME:20260420T202036Z
UID:indico-contribution-29010@indico.ific.uv.es
DESCRIPTION:Speakers: David Rodriguez Garcia (IFIC)\n(On behalf of S505-DE
 SPEC experiment collaboration)\n\nOur understanding of the production of t
 he heavy elements in the Universe is still incomplete. In particular the c
 ontribution of the rapid neutron capture (r-) process to the observed stel
 lar abundances around mass number A~195 (the 3rd r-process peak)\, which i
 s linked to the effect of  N=126 shell closure in the production path. Giv
 en the lack of nuclear data\, astrophysical abundance calculations must re
 ly on theoretical predictions\, for the important parameters T1/ 2 (half-l
 ife) and Pn (neutron emission probability). Both parameters are extracted 
 from theoretical beta-strength distributions\, which depend on nuclear str
 ucture. However\, large discrepancies exist among different theoretical mo
 dels [Mor14\,Cab16]. Our aim is to discern between models by comparing wit
 h measured beta-strengths. For this we will use Total Absorption Gamma-ray
  Spectroscopy (TAGS) which is the most effective method for obtaining beta
 -strength distributions across the entire decay energy window [Rub05].\n\n
 With this purpose\, an experiment was performed at the GSI/FAIR facility i
 n June 2022. During the experiment\, the decay of  Au and Pt isotopes with
  N=125-27 were measured. These isotopes were produced by high-energy nucle
 ar reactions using a beam of Pb on a Be target and selected and identified
  using the FRagment Separator (FRS) [Win08]. Ion implants and decay electr
 ons were measured with the Advanced Implantation and Decay Array (AIDA) [H
 al23]\, while isomeric and β-delayed γ-ray cascades were measured with t
 he Decay Total Absorption Spectrometer (DTAS) [Gua18]\, both developed wit
 hin the NUSTAR/DESPEC collaboration.\n\nWe succeeded in performing  clean 
 implanted-ion identification\, minimizing the contamination of ionic charg
 e states and reactions in the FRS. We obtained for each isotope beta-gated
  TAGS decay spectra by combining the information from the three systems. W
 e did a preliminary analysis of half-life and beta intensity distribution.
  We will discuss the status of the analysis and the work remaining.\n\nRef
 erences\n[Cab16] R. Caballero-Folch et al.\, Phys. Rev. Lett. 117\, 012501
  (2016)\n[Mor14] A.I. Morales et al.\, Phys. Rev. Lett. 113\, 022702 (2014
 ).\n[Rub05] B. Rubio et al.\, J. Phys. G 31\, S1477 (2005). \n[Gua18] V. G
 uadilla et al.\, Nucl. Instrum. Meth. Phys. Res. Sect. A 910\, 79 (2018). 
 \n[Hal23] O. Hall et al.\, Nucl. Instrum. Meth. Phys. Res. Sect. A 1050\, 
 168166 (2023)\n[Win08] M. Winkler\, et al.\, Nuclear Instruments and Metho
 ds in Physics Research Section B 266 (2008) 4183.\n\nhttps://indico.ific.u
 v.es/event/8035/contributions/29010/
LOCATION:
URL:https://indico.ific.uv.es/event/8035/contributions/29010/
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