The radioactivity of Os$_{84}$ and W$_{82}$ that lie at the two-proton drip line has been measured in an experiment performed at the Accelerator Laboratory of the University of Jyväskylä. The $^{160}$Os nuclei were produced using fusion-evaporation reactions induced by a beam of 310 MeV $^{58}$Ni ions bombarding a $^{106}$Cd target. The $^{160}$Os ions were separated in flight using the recoil separator MARA and implanted into a double-sided silicon strip detector, which was used to measure their decays. The α decays of the ground state of $^{160}$Os ( = 7092(15) keV, = 97 μs) and its isomeric state ( = 8890(10) keV, = 41 μs) were measured, allowing the excitation energy of the isomer to be determined as 1844(18) keV. These α-decay properties and the excitation energy of the isomer are compared with systematics. The α decays were correlated with subsequent decays to investigate the β decays of the ground state of $^{156}$W, revealing that unlike its isotones, both low-lying isomers were populated in its daughter nuclide, $^{156}$Ta. An improved value for the half-life of the proton-decaying high-spin isomeric state in Ta$_{83}$ of 333 ms was obtained in a separate experiment using the same experimental systems with a $^{102}$Pd target. This result was employed to improve the precision of the half-life determined for $^{156}$W, which was measured as 157 ms.
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"value": "10.1016/j.physletb.2023.138310"
}
],
"publication_info": [
{
"journal_volume": "847 C",
"journal_title": "Physics Letters B",
"material": "article",
"artid": "138310",
"year": 2023
}
],
"$schema": "http://repo.scoap3.org/schemas/hep.json",
"abstracts": [
{
"source": "Elsevier",
"value": "The radioactivity of <math><msubsup><mrow></mrow><mrow><mspace width=\"0.2em\"></mspace><mspace width=\"0.2em\"></mspace><mspace width=\"0.2em\"></mspace><mn>76</mn></mrow><mrow><mn>160</mn></mrow></msubsup></math>Os$_{84}$ and <math><msubsup><mrow></mrow><mrow><mspace width=\"0.2em\"></mspace><mspace width=\"0.2em\"></mspace><mspace width=\"0.2em\"></mspace><mn>74</mn></mrow><mrow><mn>156</mn></mrow></msubsup></math>W$_{82}$ that lie at the two-proton drip line has been measured in an experiment performed at the Accelerator Laboratory of the University of Jyv\u00e4skyl\u00e4. The $^{160}$Os nuclei were produced using fusion-evaporation reactions induced by a beam of 310 MeV $^{58}$Ni ions bombarding a $^{106}$Cd target. The $^{160}$Os ions were separated in flight using the recoil separator MARA and implanted into a double-sided silicon strip detector, which was used to measure their decays. The \u03b1 decays of the ground state of $^{160}$Os (<math><msub><mrow><mi>E</mi></mrow><mrow><mi>\u03b1</mi></mrow></msub></math> = 7092(15) keV, <math><msub><mrow><mi>t</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></math> = 97<math><msubsup><mrow></mrow><mrow><mo>\u2212</mo><mn>32</mn></mrow><mrow><mo>+</mo><mn>97</mn></mrow></msubsup></math> \u03bcs) and its isomeric state (<math><msub><mrow><mi>E</mi></mrow><mrow><mi>\u03b1</mi></mrow></msub></math> = 8890(10) keV, <math><msub><mrow><mi>t</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></math> = 41<math><msubsup><mrow></mrow><mrow><mo>\u2212</mo><mn>9</mn></mrow><mrow><mo>+</mo><mn>15</mn></mrow></msubsup></math> \u03bcs) were measured, allowing the excitation energy of the isomer to be determined as 1844(18) keV. These \u03b1-decay properties and the excitation energy of the isomer are compared with systematics. The \u03b1 decays were correlated with subsequent decays to investigate the \u03b2 decays of the ground state of $^{156}$W, revealing that unlike its isotones, both low-lying isomers were populated in its daughter nuclide, $^{156}$Ta. An improved value for the half-life of the proton-decaying high-spin isomeric state in <math><msubsup><mrow></mrow><mrow><mspace width=\"0.2em\"></mspace><mspace width=\"0.2em\"></mspace><mspace width=\"0.2em\"></mspace><mn>73</mn></mrow><mrow><mn>156</mn></mrow></msubsup></math>Ta$_{83}$ of 333<math><msubsup><mrow></mrow><mrow><mo>\u2212</mo><mn>22</mn></mrow><mrow><mo>+</mo><mn>25</mn></mrow></msubsup></math> ms was obtained in a separate experiment using the same experimental systems with a $^{102}$Pd target. This result was employed to improve the precision of the half-life determined for $^{156}$W, which was measured as 157<math><msubsup><mrow></mrow><mrow><mo>\u2212</mo><mn>34</mn></mrow><mrow><mo>+</mo><mn>57</mn></mrow></msubsup></math> ms."
}
],
"imprints": [
{
"date": "2023-11-07",
"publisher": "Elsevier"
}
],
"acquisition_source": {
"date": "2024-04-09T18:31:15.525373",
"source": "Elsevier",
"method": "Elsevier",
"submission_number": "2c6d602af69f11eeaf7a62370f8ccf13"
}
}