Short-Lived Radio-Nuclides Produced by a Synchrocyclotron

Tyrén, H.; Tove, PA

doi:10.1103/physrev.96.773

Cited by 48 publications

(48 citation statements)

References 4 publications

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“…Sc 48 is also produced by the transmutation V 51 + n 1 ? Sc 48 + He 4 , its half-life being 41 ± 3 h.'' This half-life agrees with the currently accepted value of 43.67 (9) h. 49 …”

Section: Scsupporting

confidence: 69%

“…9 Be targets were bombarded with 132 MeV/u 76 Ge ions accelerated by the Coupled Cyclotron Facility at the National Superconducting Cyclotron Laboratory at Michigan State University. 58 Sc, 59 Sc, and 60 Sc 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.…”

Section: -61mentioning

confidence: 99%

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Discovery of scandium, titanium, mercury, and einsteinium isotopes

Meierfrankenfeld

Bury

Thoennessen

2011

Atomic Data and Nuclear Data Tables

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“…Sc 48 is also produced by the transmutation V 51 + n 1 ? Sc 48 + He 4 , its half-life being 41 ± 3 h.'' This half-life agrees with the currently accepted value of 43.67 (9) h. 49 …”

Section: Scsupporting

confidence: 69%

Section: -61mentioning

confidence: 99%

Discovery of scandium, titanium, mercury, and einsteinium isotopes

Meierfrankenfeld

Bury

Thoennessen

2011

Atomic Data and Nuclear Data Tables

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“…Recent work on the lithiumboron reactions in this laboratory has shown that the lower levels of the residual nuclei tend to be formed with a cross section proportional to 2J+1, where J is the residual nuclear spin. 6 More recent unpublished work in this laboratory shows this is also true of the lithiumberyllium reactions. Under these circumstances one would expect observable amounts of gamma radiation from any bound residual nucleus level if such a level exists and if gamma radiation is possible.…”

Section: Introductionmentioning

confidence: 81%

Branching Ratios inC14andN14

Carlson

1966

Phys. Rev.

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The Be 9 (Li 7 ,d)C 14 and B 10 (Li 6 ,d)N 14 reactions were used as sources of gamma-emitting excited states of C 14 and N 14 . Three-parameter measurements of E, dE/dx, and E y in 1024 X1024 X256-channel detail were used to identify deuteron groups and the gamma rays associated with them. Radiation from six bound levels in C 14 and from eight bound levels in N 14 was analyzed to give branching ratios. Results are generally in agreement with previous measurements where they have been made. Two unbound levels in N 14 are found to gamma-decay in competition with proton decay.

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“…"[The figure] represents the two-dimensional plot (energy loss versus time-of-flight) obtained under these conditions after 40 h integration time with an average intensity of 150 enA. The new species 35,36 Mg, 38,39 Al, 40,41 Si, 43,44 P, 45,46,47 S, 46,47,48,49 Cl, and 49,50,51 Ar are clearly visible." 37 Mg 37 Mg was discovered by Sakurai et al in 1996 as reported in "Production and identification of new neutron-rich nuclei, 31 Ne and 37 Mg, in the reaction 80A MeV 50 Ti + 181 Ta" [46].…”

Section: 30 Mgmentioning

confidence: 99%

“…Therefore, 23 Al is bound to 22 Mg+p by 146±82 keV and is nucleon stable." Previously a 130 ms activity was assigned to either 23 Al or 22 Mg [38]. 24…”

Section: Almentioning

confidence: 99%

Discovery of the Isotopes with 11≤Z≤19

Thoennessen

2012

Atomic Data and Nuclear Data Tables

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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....

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Short-Lived Radio-Nuclides Produced by a Synchrocyclotron

Abstract: A method of studying short-lived radio-nuclides produced by the internal beam in a synchrocyclotron is described. Preliminary results on a number of proton-produced activities in the mass range below 70 are given.

Cited by 48 publications

References 4 publications

Discovery of scandium, titanium, mercury, and einsteinium isotopes

Discovery of scandium, titanium, mercury, and einsteinium isotopes

Branching Ratios inC14andN14

Discovery of the Isotopes with 11≤Z≤19

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