Decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:mrow><mml:mrow><mml:mn>26</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>

Robinson, E. L.; Johnson, O. E.

doi:10.1103/physrev.120.1321

Cited by 17 publications

(7 citation statements)

References 20 publications

(2 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…McPherson et al [36] who acknowledged the tentative observation by Barton et al 26 Si 26 Si was identified in 1960 by Robinson and Johnson in "Decay of Si 26 " [68]. Magnesium targets were bombarded with an 8 MeV 3 He beam from the Purdue 37-in cyclotron.…”

Section: Simentioning

confidence: 99%

“…Guillemaud-Mueller et al reported the observation of even more neutron-rich argon isotopes ( 49−51 Ar) earlier, but did not mention or show any evidence for 48 Ar referring to an internal report [125]. 68 Cr, 70 Mn)." 52 Ar was not specifically mentioned as a new observation because of the previous publication in a conference abstract [126], however, it is clearly visible in the particle identification plot of the measured atomic number Z versus the calculated function N−Z.…”

Section: Armentioning

confidence: 99%

“…55 K and 56 K were produced in projectile fragmentation reactions and identified with a two-stage separator consisting of the A1900 fragment separator and the S800 analysis beam line. "The observed fragments include fifteen new isotopes that are the most neutron-rich nuclides of the elements chlorine to manganese ( 50 Cl, 53 Ar, 55,56 K, 57,58 Ca, 59,60,61 Sc, 62,63 Ti, 65,66 V, 68 Cr, 70 Mn). "…”

Section: −54 Kmentioning

confidence: 99%

“…It is concluded from activation and lifetime evidence that these protons are beta-delayed protons emitted from excited states of Al following the beta decay of Si 25 ." The half-life was subsequently measured by McPherson et al [36] who acknowledged the tentative observation by Barton et al 26 Si 26 Si was identified in 1960 by Robinson and Johnson in "Decay of Si 26 " [68]. Magnesium targets were bombarded with an 8 MeV 3 He beam from the Purdue 37-in cyclotron.…”

Section: Simentioning

confidence: 99%

“…50 Cl was produced in projectile fragmentation reactions and identified with a two-stage separator consisting of the A1900 fragment separator and the S800 analysis beam line. "The observed fragments include fifteen new isotopes that are the most neutron-rich nuclides of the elements chlorine to manganese ( 50 Cl, 53 Ar, 55,56 K, 57,58 Ca, 59,60,61 Sc, 62,63 Ti, 65,66 V, 68 Cr, 70 Mn)." Lewitowicz et al discovered 51 Cl in the 1990 paper "First observation of the neutron-rich nuclei 42 Si, 45,46 P, 48 S, and 51 Cl from the interaction of 44 MeV/u 48 Ca + 64 Ni" [78].…”

Section: −49 CLmentioning

confidence: 99%

See 4 more Smart Citations

Discovery of the Isotopes with 11≤Z≤19

Thoennessen

2012

Atomic Data and Nuclear Data Tables

View full text Add to dashboard Cite

A total of 194 isotopes with 11 ≤ Z ≤ 19 have been identified to date. The discovery of these isotopes which includes the observation of unbound nuclei, is discussed. For each isotope a brief summary of the first refereed publication, including the production and identification method, is presented. publication, the laboratory where the isotopes were produced as well as the production and identification methods are discussed. When appropriate, references to conference proceedings, internal reports, and theses are included. When a discovery includes a half-life measurement the measured value is compared to the currently adopted value taken from the NUBASE evaluation [2] which is based on the ENSDF database [3]. In cases where the reported half-life differed significantly from the adopted half-life (up to approximately a factor of two), we searched the subsequent literature for indications that the measurement was erroneous. If that was not the case we credited the authors with the discovery in spite of the inaccurate half-life.proton beam from the Berkeley linear accelerator bombarded a proportional counter filled with neon and delayed heavy particles were observed in the counter. "Two new positron active isotopes, B 8 and Na 20 , have been found to decay to excited states of Be 8 and Ne 20 , which in turn decay "instantaneously" by alpha-emission. Their half-lives are 0.65±0.1 sec. and 1/4 sec., respectively." The half-life of 20 Na is within a factor of two of the accepted value of 447.9(23) ms. 21 Na In the 1940 paper "Transmutation of the separated isotopes of neon by deuterons" Pollard et al. reported the observation of 21 Na [17]. Neon gas was bombarded with 2.6 MeV deuterons and the isotopes were separated by thermal diffusion. 21 Na produced in the reaction 20 Ne(d,n) and decay curves and absorption spectra were measured. "A rather weak gamma-ray was found but this did not decay with the 43-second half-life expected. In [the figure] the decay curve is shown. It has a half-life of 26±3 seconds and is almost certainly to be identified with Na 21 discovered by Creutz, Fox, and Sutton [18] and here produced by the reaction Ne 20 +H 2 →Na 21 +n." This half-life agrees with the currently adopted value of 22.49(4) (s). The work by Creutz et al. mentioned in the quote was only published as an abstract of a meeting. 22 Na 22 Na was discovered in 1935 by Frisch as reported in the paper "Induced radioactivity of fluorine and calcium" [19].Alpha particles from a 600 mCi radon source were used to irradiate sodium fluoride and lithium fluoride and 22 Na was formed in the reaction 19 F(α,n). "The search for Na 22 was therefore continued with sodium fluoride and lithium fluoride.In both cases weak activity was observed after prolonged bombardment. A chemical separation, kindly carried out by Prof. G. von Hevesy, showed that the active body follows the reactions of sodium, and therefore is presumably Na 22 ."The estimated half-life between one and several years is consistent with the currently adopted value of 2.6019(4) y....

show abstract

Section: Simentioning

confidence: 99%