First <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-decay spectroscopy of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>In</mml:mi><mml:mprescripts/><mml:none/><mml:mn>135</mml:mn></mml:mmultiscripts></mml:math> and new <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-decay branches of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>In</mml:mi><mml:mprescripts/><mml:none/><mml:mn>134</mml:mn></mml:mmultiscripts></mml:math>
Bibliographic record
Abstract
The $\ensuremath{\beta}$ decay of the neutron-rich $^{134}\mathrm{In}$ and $^{135}\mathrm{In}$ was investigated experimentally in order to provide new insights into the nuclear structure of the tin isotopes with magic proton number $Z=50$ above the $N=82$ shell. The $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$-ray spectroscopy measurement was performed at the ISOLDE facility at CERN, where indium isotopes were selectively laser-ionized and on-line mass separated. Three $\ensuremath{\beta}$-decay branches of $^{134}\mathrm{In}$ were established, two of which were observed for the first time. Population of neutron-unbound states decaying via $\ensuremath{\gamma}$ rays was identified in the two daughter nuclei of $^{134}\mathrm{In}, ^{134}\mathrm{Sn}$ and $^{133}\mathrm{Sn}$, at excitation energies exceeding the neutron separation energy by 1 MeV. The $\ensuremath{\beta}$-delayed one- and two-neutron emission branching ratios of $^{134}\mathrm{In}$ were determined and compared with theoretical calculations. The $\ensuremath{\beta}$-delayed one-neutron decay was observed to be dominant $\ensuremath{\beta}$-decay branch of $^{134}\mathrm{In}$ even though the Gamow-Teller resonance is located substantially above the two-neutron separation energy of $^{134}\mathrm{Sn}$. Transitions following the $\ensuremath{\beta}$ decay of $^{135}\mathrm{In}$ are reported for the first time, including $\ensuremath{\gamma}$ rays tentatively attributed to $^{135}\mathrm{Sn}$. In total, six new levels were identified in $^{134}\mathrm{Sn}$ on the basis of the $\ensuremath{\beta}\ensuremath{\gamma}\ensuremath{\gamma}$ coincidences observed in the $^{134}\mathrm{In}$ and $^{135}\mathrm{In}\phantom{\rule{4pt}{0ex}}\ensuremath{\beta}$ decays. A transition that might be a candidate for deexciting the missing neutron single-particle $13/{2}^{+}$ state in $^{133}\mathrm{Sn}$ was observed in both $\ensuremath{\beta}$ decays and its assignment is discussed. Experimental level schemes of $^{134}\mathrm{Sn}$ and $^{135}\mathrm{Sn}$ are compared with shell-model predictions. Using the fast timing technique, half-lives of the ${2}^{+}, {4}^{+}$, and ${6}^{+}$ levels in $^{134}\mathrm{Sn}$ were determined. From the lifetime of the ${4}^{+}$ state measured for the first time, an unexpectedly large $B(E2;{4}^{+}\ensuremath{\rightarrow}{2}^{+})$ transition strength was deduced, which is not reproduced by the shell-model calculations.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.005 |
| Meta-epidemiology (narrow) | 0.003 | 0.002 |
| Meta-epidemiology (broad) | 0.001 | 0.002 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.007 | 0.006 |
| Open science | 0.004 | 0.002 |
| Research integrity | 0.003 | 0.005 |
| Insufficient payload (model declined to judge) | 0.519 | 0.603 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".