The Shape of the Low Energy Beta-Spectrum of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Rb</mml:mi></mml:mrow><mml:mrow><mml:mn>86</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>

Muether, H.; Ridgway, S. L.

doi:10.1103/physrev.80.750.2

Cited by 15 publications

(3 citation statements)

References 5 publications

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“…28, 30 The 700-kev beta group is generally reported as having an allowed shape. 30 Angular correlation measurements indicate an E2 transition for the gamma ray.…”

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confidence: 99%

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Beta Spectra ofPr142,Tm170, and
Pohm
¹
,
Lewis
²
,
Talboy
³

et al. 1954
Phys. Rev.

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1523the first excited state in Ni 61 , both of which have been tentatively assigned a spin 7/2~ on the questionable basis of the angular distribution of proton group 4. The (n,y) measurements show a strong transition to one of these states and the positron decay from Cu 61 to the other is believed 10 to be allowed. Both of these observations are in disagreement with the 7/2 spin assignments. Whether these discrepancies can be attributed to the presence of one or more states which have not as yet been observed, to the presence of cascade gamma rays in the (n,y) measurements, or to some other defect in our analysis, is not known at this time. V. CROSS SECTIONSFrom the known values of integrated deuteron beam current, target thickness, and solid angle subtended by the detecting plates, it is possible to obtain the cross The beta spectra and gamma rays of the isotopes Tm 170 , Pr 142 , and Rb 86 have been examined with various types of spectrometers. An intermediate-image beta-ray spectrometer with a 10 percent transmission and a 5.5 percent resolution was used to examine the total and coincidence beta spectra. Total beta spectra were also studied with a thin-lens spectrometer set to about two percent resolution. Gamma rays were also studied with a scintillation spectrometer.The results of the investigation indicate that the 125-day activity of Tm 170 has two beta groups with maximum energies of 970±2 kev and 886±9 kev. Their respective intensities are about 78 percent and 22 percent, and their respective log ft values are approximately 9.0 and 9.1. Both beta groups are assigned as first forbidden transitions with A7=rbl, "y e s." The single observed gamma ray of Tm 170 is assigned as an E2 transition with an energy of 84.1 ±0.4 kev.The 19.2-hr activity of Pr 142 has two beta groups with maximum energies of 2166±6 kev and 586±15 kev. The 2166-kev beta group has a log ft value of about 7.8 and the 586-kev beta group has a log ft value of about 7.1. The log[(WV-1)//] value of the 2166-kev beta group is 10.2. The intensities for the 2166-kev and

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“…28, 30 The 700-kev beta group is generally reported as having an allowed shape. 30 Angular correlation measurements indicate an E2 transition for the gamma ray.…”

mentioning

confidence: 99%

“…28, 30 The 700-kev beta group is generally reported as having an allowed shape. 30 Angular correlation measurements indicate an E2 transition for the gamma ray. 35 The investigation of the beta spectra of Pr 142 revealed it has two beta groups.…”

mentioning

confidence: 99%

Beta Spectra ofPr142,Tm170, and
Pohm
¹
,
Lewis
²
,
Talboy
³

et al. 1954
Phys. Rev.

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“…Gorodetsky et al (1955) have obtained a resolution of 9 per cent on the 624 keV internal conversion elec trons from Cs137 using an anthracene crystal and RCA 6342 photomultiplier, and they have observed partial resolution of the conversion electrons from the K-and L-shells. The low-energy /9-spectrum of Rb8e (Emax = 700 keV) has been measured against the background of the high-energy ß-spectrum C^max =1*8 MeV) by coincidence measurement with the associated y-rays detected by a Nal (Tl) scintillation spectrometer (Muether and Ridgway, 1950).…”

Section: /J-particle Spectrometrymentioning

confidence: 99%