$$\beta $$-Decay endpoint energy measurement in $$^{150}$$Pm$$\rightarrow ^{150}$$Sm using $$\beta - \gamma $$ coincidence

The decay of 1.3 h 87Kr, 2.8 h 88Kr, and 15 min 88Rb to levels in 87Rb, 88Rb, and 88Sr, respectively, has been investigated using high-resolution Ge(Li) detectors, a plastic beta-ray detector, and gamma–gamma as well as beta–gamma coincidence techniques. Isotope separation was achieved using gas-sweeping methods. Consistent level schemes have been constructed for each isotope under study.

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Beta decay of 187W

Canadian Journal of Physics ◽

10.1139/p70-135 ◽

1970 ◽

Vol 48 (9) ◽

pp. 1040-1054 ◽

Cited By ~ 12

Author(s):

A. W. Herman ◽

E. A. Heighway ◽

J. D. MacArthur

Keyword(s):

Excited State ◽

Beta Decay ◽

Decay Scheme ◽

Decay Energy ◽

Beta Transition ◽

Point Energy ◽

Absolute Intensities ◽

Gamma Coincidence ◽

First Excited State ◽

Coincidence Measurements

Coincidence studies have established in the decay scheme of,187W the existence of transitions of energy 7, 36, 77, 455, 589, and 639 keV with intensities of 3.0 ± 0.5%, 0.50 ± 0.06%, 0.31 ± 0.07%, 0.05 ± 0.02%, 0.14 ± 0.04%, and 0.05 ± 0.02% respectively as well as yielding the absolute intensities of the well-known transitions in 187Re. In addition the beta–gamma coincidence measurements have shown that (1) a first-forbidden unique transition feeds the first-excited state of 187Re, (2) there is at most a very weak beta transition to the level at 512 keV, (3) there is no inner beta group of about 300 keV end-point energy and intensity 8% as indicated by several earlier investigations, and (4) the decay energy of 187W to 187Re is 1311 ± 2 keV. The relevance of these observations to the structure of 187Re is discussed.

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Levels in 89Rb Populated by the Beta Decay of 89Kr

Canadian Journal of Physics ◽

10.1139/p72-366 ◽

1972 ◽

Vol 50 (22) ◽

pp. 2741-2752 ◽

Cited By ~ 5

Author(s):

W. F. S. Poehlman ◽

B. Singh ◽

M. W. Johns

Keyword(s):

Excited States ◽

Beta Decay ◽

Gamma Rays ◽

Large Volume ◽

Ground State ◽

Level Scheme ◽

Gamma Coincidence ◽

Coincidence Data ◽

Coincidence Arrangement

The decay of 3.2 min 89Kr has been investigated with small and large volume Ge(Li) detectors used singly and in a dual parameter coincidence arrangement. A total of 162 gamma rays are identified with the decay of this isotope, 120 of which are placed in a level scheme on the basis of gamma–gamma coincidence evidence and the energy differences between established levels. Levels at 220.9, 497.7, 577.3, 586.1, 930.7, 931.5, 997.6, 1195.5, 1324.6, 1530.1, 1533.6, 1694.1, 1822.1, 1998.9, 2160.5, 2401.5, 2598.5, 2867.2, 3099.7, 3329.9, 3363.1, 3372.1, 3534.1, 3719.3, 4145.1, 4217.4, 4340.9, and 4487.5 keV are well established by coincidence data and many energy sums. The levels proposed at 2783.4, 3429.7, 3456.6, 3978.4, 4058.4, and 4406.5 keV are less securely established. The most probable spins of the ground state and the first two excited states arc 3/2−. 5/2− and 1/2− respectively. Improved energies and intensities of the gamma rays from the decay of 15 min 89Rb have also been determined.

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The Decay of 95Rh to Levels of 95Ru

Canadian Journal of Physics ◽

10.1139/p75-015 ◽

1975 ◽

Vol 53 (2) ◽

pp. 101-106 ◽

Cited By ~ 11

Author(s):

C. Weiffenbach ◽

S. C. Gujrathi ◽

J. K. P. Lee

Keyword(s):

Energy Measurement ◽

Mass Excess ◽

Isomeric Transition ◽

Endpoint Energy

The decay of 95Rhg (T1/2 = 5.02 ± 0.10 min) and 95Rhm (T1/2 = 1.96 ± 0.04 min) have been studied using Ge(Li) detectors and a plastic β detector. A 543.3 ± 0.3 keV isomeric transition has been identified. Gamma–gamma and gamma–beta coincidence experiments were performed. From the β endpoint energy measurement, the mass excess of 95Rh was determined to be −78.34 ± 0.15 MeV. Decay schemes for the 95Rhg,m are proposed.

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