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Precision mass measurements on neutron-rich rare-earth isotopes at JYFLTRAP - reduced neutron pairing and implications for the $r$-process calculations
- Publication Year :
- 2018
-
Abstract
- The rare-earth peak in the $r$-process abundance pattern depends sensitively on both the astrophysical conditions and subtle changes in nuclear structure in the region. This work takes an important step elucidating the nuclear structure and reducing the uncertainties in $r$-process calculations via precise atomic mass measurements at the JYFLTRAP double Penning trap. $^{158}$Nd, $^{160}$Pm, $^{162}$Sm, and $^{164-166}$Gd have been measured for the first time and the precisions for $^{156}$Nd, $^{158}$Pm, $^{162,163}$Eu, $^{163}$Gd, and $^{164}$Tb have been improved considerably. Nuclear structure has been probed via two-neutron separation energies $S_{2n}$ and neutron pairing energy metrics $D_n$. The data do not support the existence of a subshell closure at $N=100$. Neutron pairing has been found to be weaker than predicted by theoretical mass models. The impact on the calculated $r$-process abundances has been studied. Substantial changes resulting in a smoother abundance distribution and a better agreement with the solar $r$-process abundances are observed.<br />8 pages, 4 figures, accepted for publication in Physical Review Letters
- Subjects :
- Nuclear Theory
astrofysiikka
Rare earth
nuclear astrophysics
General Physics and Astronomy
FOS: Physical sciences
7. Clean energy
01 natural sciences
binding energy and masses
Nuclear Theory (nucl-th)
0103 physical sciences
Neutron
Nuclear Experiment (nucl-ex)
010306 general physics
Nuclear Experiment
Solar and Stellar Astrophysics (astro-ph.SR)
Physics
High Energy Astrophysical Phenomena (astro-ph.HE)
Isotope
ta114
010308 nuclear & particles physics
Nuclear structure
harvinaiset maametallit
Penning trap
Atomic mass
3. Good health
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Pairing
r-process
Atomic physics
ydinfysiikka
Astrophysics - High Energy Astrophysical Phenomena
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....ff07034c503dc3af5cccbab5e0505f7a