Shedding Light on the Origin of 204Pb, the Heaviest s-Process-Only Isotope in the Solar System
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10494225" target="_blank" >RIV/00216208:11320/24:10494225 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=hj8vHGmpnn" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=hj8vHGmpnn</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.133.052702" target="_blank" >10.1103/PhysRevLett.133.052702</a>
Alternative languages
Result language
angličtina
Original language name
Shedding Light on the Origin of 204Pb, the Heaviest s-Process-Only Isotope in the Solar System
Original language description
Asymptotic giant branch stars are responsible for the production of most of the heavy isotopes beyond Srobserved in the solar system. Among them, isotopes shielded from the r-process contribution by their stableisobars are defined as s-only nuclei. For a long time the abundance of 204Pb, the heaviest s-only isotope, hasbeen a topic of debate because state-of-the-art stellar models appeared to systematically underestimate itssolar abundance. Besides the impact of uncertainties from stellar models and galactic chemical evolutionsimulations, this discrepancy was further obscured by rather divergent theoretical estimates for the neutroncapture cross section of its radioactive precursor in the neutron-capture flow, 204Tl (t1=21/4 3.78 yr), and bythe lack of experimental data on this reaction. We present the first ever neutron capture measurement on204Tl, conducted at the CERN neutron time-of-flight facility n_TOF, employing a sample of only 9 mg of204Tl produced at the Institute Laue Langevin high flux reactor. By complementing our new results withsemiempirical calculations we obtained, at the s-process temperatures of kT ALMOST EQUAL TO 8 keV and kT ALMOST EQUAL TO 30 keV,Maxwellian-averaged cross sections (MACS) of 580(168) mb and 260(90) mb, respectively. These figuresare about 3% lower and 20% higher than the corresponding values widely used in astrophysicalcalculations, which were based only on theoretical calculations. By using the new 204Tl MACS, theuncertainty arising from the 204Tlðn; γÞ cross section on the s-process abundance of 204Pb has been reducedfrom TILDE OPERATOR+D9130% down to þ8%= - 6%, and the s-process calculations are in agreement with the latest solarsystem abundance of 204Pb reported by K. Lodders in 2021.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review Letters
ISSN
0031-9007
e-ISSN
1079-7114
Volume of the periodical
133
Issue of the periodical within the volume
05
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
052702
UT code for WoS article
001310903800008
EID of the result in the Scopus database
2-s2.0-85201738849