English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The Gamow-Teller strength distribution from ${}^{88}$Sr was extracted from a$(t,{}^{3}\text{He}+\gamma)$ experiment at 115 MeV/$u$ to constrain estimatesfor the electron-capture rates on nuclei around $N=50$, between and including$^{78}$Ni and $^{88}$Sr, which are important for the late evolution ofcore-collapse supernovae. The observed strength below an excitation energy of 8MeV was consistent with zero and below 10 MeV amounted to $0.1\pm0.05$. Exceptfor a very-weak transition that could come from the 2.231-MeV $1^{+}$ state, no$\gamma$ lines that could be associated with the decay of known $1^{+}$ stateswere identified. The derived electron-capture rate from the measured strengthdistribution is more than an order of magnitude smaller than rates based on thesingle-state approximation presently used in astrophysical simulations for mostnuclei near $N=50$. Rates based on shell-model and quasiparticle random-phaseapproximation calculations that account for Pauli blocking andcore-polarization effects provide better estimates than the single-stateapproximation, although a relatively strong transition to the first $1^{+}$state in $^{88}$Rb is not observed in the data. Pauli unblocking effects due tohigh stellar temperatures could partially counter the low electron-capturerates. The new data serves as a zero-temperature benchmark for constrainingmodels used to estimate such effects.

physical review. c

Experimental Constraint on Stellar Electron-Capture Rates from the  ${}^{88}\text{Sr}(t,{}^{3}\text{He}+\gamma){}^{88}\text{Rb}$ reaction at 115  MeV/u