Short-lived isotopes of alkali and alkaline-earth elements studied by on-line isotope separator techniques

Ravn, H.L.; Sundell, S.; Westgaard, L.; Roeckl, E.

doi:10.1016/0022-1902(75)80343-5

Cited by 88 publications

(23 citation statements)

References 16 publications

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“…The fl-7 decay of this nuclide has been observed by several authors [13,[37][38][39][40][41][42]. A scheme of excited levels in 77Kr fed by the 77Rb decay was established by Gamma-ray energies from the present work {without superscript) are good to + 2 keV.…”

Section: The Decay Of 38 Min 77rbmentioning

confidence: 97%

“…Alkali and alkaline-earth isotopes were produced [12][13][14] by means of a surface ionization source in connection with molten targets of La metal, Y-La or Th-La alloy, respectively, which were bombarded with 600 MeV protons from the CERN Synchrocyclotron (SC). The ions were separated on-line according to their mass by passage through a magnetic separator [5].…”

Section: On-line Mass Separationmentioning

confidence: 99%

“…An example of the latter is the "ridge" in the mass surface, discovered by Westgaard et al [9] in their studies of Q~ values in the A=182 and A=186 positron-decay chains. Recent progress in the target techniques [12][13][14] has considerably enlarged the range of products available for study at ISOLDE, and has enabled extension of Q~ measurements to a number of short-lived isotopes of rubidium, caesium, radium, and francium. The experimental technique, described in Section 2, is for the most part similar to earlier ISOLDE work [6][7][8][9][10][11] of this type, i.e.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 1975

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Abstract. Total decay energies have been measured for a number of neutron-deficient Rb and Cs isotopes, as well as for some neutron-rich isotopes of Fr and Ra. Mass separated sources were produced at the ISOLDE on-line separator at CERN. By applying two different /3-7 coincidence methods, Q values or their lower limits were determined for 76 78Rb ' 80Rb ' 121-124Cs ' 222Fr ' z24-Z26Fr ' 229Ra 229Ac" For many of these nuclei, the atomic mass excesses could be derived, allowing the comparison of masses of far unstable nuclei with predictions from mass formulae. The odd-odd nuclei 76Rb and 78Rb appear to be 1-1 89 MeV more strongly bound than expected from the systematics.

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Section: The Decay Of 38 Min 77rbmentioning

confidence: 97%

Section: On-line Mass Separationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 1975

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“…The production yields of radon were measured by means of a tape transport system and 4~r plastic detector as described in [3]. Figure 1 shows the measured intensities of the radon ion beams obtained from the newly developed ThCz target, and compares them with results from the previously used ThO2 powder target [1].…”

Section: Yieldsmentioning

confidence: 99%

New isotope227Rn and revised halflives for223Rn and226Rn

Borge

Burke

Calaprice

et al. 1986

Z. Physik A - Atomic Nuclei

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Neutron-rich isotopes of radon, produced by spallation reactions in a ThC2 target and selected chemically, were mass-separated and used as samples for radiation counting experiments. Assignments of the activities to radon isotopes were confirmed by genetic relationships to the previously known francium daughters. The halflife for the new isotope 227Rn is 23_+ 1 s and that for 226Rn is 7.4_+ 0.1 min. X-rays, 7-rays, and conversion electrons from the 223Rn activity were measured. The decay patterns of K X-rays and known gamma transitions in the 223Fr daughter yield a halflife of 23.2___ 0.4 min for 22aRn, in contrast to the value of 43 + 5 rain reported earlier. Energies, intensities, and likely multipolarities for the most prominent gamma transitions in the ZZ3Rn ~ 223Fr decay are presented.

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“…The isotope 76Rb was identified in a mass separator experiment [34] by investigation of the fl decay to 76Kr. The half-life of the ground state is 39.1(6) s [31].…”

Section: Introductionmentioning

confidence: 99%

Identification of a 3.2?s isomer in76Rb

Hofmann

Zychor

Heßberger

et al. 1986

Z. Physik A - Atomic Nuclei

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Fusion evaporation reactions were investigated to search for short lived isomeric states of nuclei near the proton drip line. Gamma spectra were measured, both singles and in delayed coincidence with evaporation residues implanted into a silicon detector after a velocity separation. A short lived activity was measured in the 4~176 ~ 8~ reaction at excitation energies between 55 and 79 MeV. A half-life of 3.20(10) gs was determined from delayed coincidences between evaporation residues and gamma rays. At E*= 55 MeV the cross section is 9 mb. The activity was assigned to an isomeric state in 76Rb by investigation of excitation functions. The isomer decays by emission of four gamma rays with energies of 70.55(5), 101.30(4), 145.11 (5), and 246.32(10) keV. A first level scheme is proposed assigning to the isomeric state an energy of 316.94(7) keV above the ground state. The isomer decaying into the low spin 1 (-) ground state band is explained from systematics as a band head of a high spin (4 +) (7"cg9/2, vg9/2) structure.A high hindrance factor of 3 x 106 for E1 radiation compared to a single particle transition is due possibly to a change of the core particle structure in the transition.

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Short-lived isotopes of alkali and alkaline-earth elements studied by on-line isotope separator techniques

Cited by 88 publications

References 16 publications

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

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

New isotope227Rn and revised halflives for223Rn and226Rn

Identification of a 3.2?s isomer in76Rb

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