Beta-decay energies and masses of short-lived isotopes of rubidium, caesium, francium, and radium

Westgaard, L.; Aleklett, K.; Nyman, G.; Roeckl, E.

doi:10.1007/bf01409588

Cited by 76 publications

(6 citation statements)

References 47 publications

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“…Our measurement gives I (fl) = 8000_+ 2000 relative to I~= 1000 for the 196 keV transition. This value is consistent with the previous result of Westgaard [14]:…”

Section: The 121xe Level Schemesupporting

confidence: 94%

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Non-yrast level structure of121Xe via beta decay of121m+g Cs

Genevey

Gizon

Marguier

et al. 1991

Z. Physik A - Hadrons and Nuclei

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The results of measurements of the gamma-ray and conversion-electron singles and coincidence spectra from the decay of the 122 s leJmCS and the 155 s 12~gCs to levels of ~2~Xe are reported. The M3 multipolarity of the 68.5 keV isomeric transition in 12~Cs has been deduced. Numerous low-lying levels below 1.6 MeV excitation energy are found. A negative-parity level at 355.9 keV is observed for the first time. The results supplement the low lying energy level systematics in odd-A xenons. A comparison is made with the N = 67 barium isotone.

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“…Our measurement gives I (fl) = 8000_+ 2000 relative to I~= 1000 for the 196 keV transition. This value is consistent with the previous result of Westgaard [14]:…”

Section: The 121xe Level Schemesupporting

confidence: 94%

“…In the A= 121 decay chain, gamma transitions belonging to ~alXe have been identified at CERN for the first time [14]. Later, collective structures in ~2tXe have been established from in-beam experiments using the 11~ p2n) [15] and the 112Cd(aZC, 3n) 1-16, 1] reactions.…”

Section: Introductionmentioning

confidence: 98%

Non-yrast level structure of121Xe via beta decay of121m+g Cs

Genevey

Gizon

Marguier

et al. 1991

Z. Physik A - Hadrons and Nuclei

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“…The quoted value is the currently accepted half-life. This value is consistent with the currently adopted value of 0.30(5) s. bidium, caesium, francium, and radium" [102]. Lanthanum, yttrium-lanthanum, and thorium-lanthanum targets were irradiated with 600 MeV protons from the CERN synchrocyclotron.…”

supporting

confidence: 87%

Discovery of the astatine, radon, francium, and radium isotopes

Fry

Thoennessen

2013

Atomic Data and Nuclear Data Tables

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Currently, thirty-nine astatine, thirty-nine radon, thirty-five francium, and thirty-four radium isotopes have so far been observed; the discovery of these isotopes is discussed. For each isotope a brief summary of the first refereed publication, including the production and identification method, is presented. Contents IntroductionThe discovery of astatine, radon, francium, and radium isotopes is discussed as part of the series summarizing the discovery of isotopes, beginning with the cerium isotopes in 2009 [1]. Guidelines for assigning credit for discovery are (1) clear identification, either through decay-curves and relationships to other known isotopes, particle or γ-ray spectra, or unique mass and Z-identification, and (2) publication of the discovery in a refereed journal. The authors and year of the first 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. All reported half-lives inconsistent with the presently adopted half-life for the ground state were compared to isomer half-lives and accepted as discoveries if appropriate following the criterium described above.The first criterium is not clear cut and in many instances debatable. Within the scope of the present project it is not possible to scrutinize each paper for the accuracy of the experimental data as is done for the discovery of elements [4]. In some cases an initial tentative assignment is not specifically confirmed in later papers and the first assignment is tacitly accepted by the community. The readers are encouraged to contact the authors if they disagree with an assignment because they are aware of an earlier paper or if they found evidence that the data of the chosen paper were incorrect.The discovery of several isotopes has only been reported in conference proceedings which are not accepted according to the second criterium. One example from fragmentation experiments why publications in conference proceedings should not be considered is 118 Tc and 120 Ru which had been reported as being discovered in a conference proceeding [5] but not in the subsequent refereed publication [6]. 2 The initial literature search was performed using the databases ENSDF [3] and NSR [7] of the National Nuclear Data Center at Brookhaven National Laboratory. These databases are complete and reliable back to the early 1960's. For earlier references, several editions of the Table of Iso...

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“…The coincidence data show that 491 and 925keV transitions feed the 388keV level and that the 879keV transition feeds the ground state. The log ft values were obtained by taking T1/2 = (98.6 _+ 0.1) s [12], I~ + (388)/I~ + (ground state) = 31/54 [13] and QEc = (4760 4-100) keV, which is the average value between Q~c=(4690_+140)keV [9] and Q~c=(4830___ 140) keV [14]. The log f values were taken from tables given by Gove et al [15,16].…”

Section: The 126cs----~126xe Decaymentioning

confidence: 99%

“…The decay of the 126Ba---~126Cs---~126Xe chain was investigated by Arlt et al [5,6], Blinowska et al [3] and recently by Pathak et al [7]. Levels in ~24Xe have been previously investigated by Droste et al [2], Arlt et al [8], and Westgaard et al [9]. In these experiments the levels of xenon were populated from the decay of ~24Cs and/or the 124Ba__ + 124Cs ~ 124Xe chain.…”

Section: Introductionmentioning

confidence: 95%