Sur la Mise en Evidence de Faibles Branches β dans la Désintégration de 77As

1971 ◽  
Vol 49 (13) ◽  
pp. 1731-1737 ◽  
Author(s):  
G. Ardisson ◽  
C. Marsol
Keyword(s):  
Gamma Rays ◽  
Level Scheme ◽  
Branching Ratio ◽  
Coincidence Spectra

The decay of 77As was reinvestigated by means of a Ge(Li) detector, γ–γ coincidences and sum coincidence spectra were also measured with a Ge(Li)–NaI(Tl) assembly. Five new gamma rays are observed at 62.2, 82.0, 139.2, 200.6, and 439.7 keV, which are situated in a revised level scheme of 77Se. An anomalous 5/2+ level of 301 keV, seen in 76Se(d,p)77Se experiments, is suggested to be fed in the decay of 77As, with a branching ratio of 0.014%. The 440 keV (5/2−) collective level is also fed by 0.001% of the decays.

STUDIES IN THE DECAY OF THE ACTIVE DEPOSIT OF ACTINIUM: III. LEVELS IN 211Bi AND ITS DAUGHTER PRODUCTS

1967 ◽  
Vol 45 (7) ◽  
pp. 2295-2313 ◽  
Author(s):  
W. F. Davidson ◽  
C. R. Cothern ◽  
R. D. Connor
Keyword(s):  
Solid State ◽  
Gamma Rays ◽  
Level Scheme ◽  
Decay Scheme ◽  
Gamma Ray ◽  
Branching Ratio ◽  
Upper Limits ◽  
Single Transition ◽  
Detailed Level

Previous work on the decay of 211Pb has been developed and extended using lithium-drifted germanium detectors and sum–coincidence techniques. A more detailed level scheme for 211Bi has been produced with greater precision in the determination of the energies and intensities of the 16 gamma rays observed.The alpha decays of 211Bi and 211Po have been studied using solid-state detectors with a resolution of 15.5 keV at 6 MeV. The alpha branching of 211Bi to the 350-keV level in 207Tl has been found to be 16.43 ± 0.04% and that of 211Po to the 570-keV level in 207Bi to be 0.50 ± 0.07%. The beta–alpha branching ratio in the decay of 211Bi is 0.274 ± 0.004%. The data enable upper limits to be placed on any other alpha groups in the active deposit in the energy range 3–13 MeV.The gamma-ray spectrum of separated sources of 207Tl has been found to consist of a single transition of energy 898 ± 0.5 keV with an intensity of 0.002 4 ± 0.000 4 photons per 207Tl decay or 0.002 9 ± 0.000 4 photons per 211Pb decay.A decay scheme for the entire active deposit is given.

STUDIES IN THE ACTIVE DEPOSIT OF ACTINIUM: PART II: THE DECAY OF 211Pb (AcB)

1965 ◽  
Vol 43 (3) ◽  
pp. 383-403 ◽  
Author(s):  
C. R. Cothern ◽  
R. D. Connor
Keyword(s):  
Gamma Rays ◽  
Level Scheme ◽  
Gamma Ray ◽  
Ground Level ◽  
Conversion Line ◽  
Point Energy ◽  
Correlation Studies ◽  
Absolute Intensities ◽  
Gamma Coincidence ◽  
Conversion Coefficients

Studies of the active deposit of actinium using a Siegbahn–Slatis beta-ray spectrometer and scintillation counters together with gamma–gamma coincidence work and gamma–gamma angular correlation measurements have led to the establishment of a new decay scheme for 211Pb and a level scheme for 211Bi involving five excited states.The gamma rays have the following energies and absolute intensities:[Formula: see text]Conversion-line studies yielded energy values for the transitions marked with an asterisk as 403.3 ± 0.5 and 426.5 ± 0.5 keV respectively. The K conversion coefficients of the 400- and 430-keV transitions have been determined as 0.091 ± 0.018 and 0.117 ± 0.024 respectively.Fermi analysis yields 1.378 MeV as the highest end-point energy of the beta partial spectra. The remaining end points and the component intensities as deduced from the level scheme are as follows:[Formula: see text]The much less accurate results from Fermi analysis of the complete active deposit are in reasonable agreement with these data.Angular correlation studies of the 430–400- and 706–400-keV gamma-ray cascades have yielded spins for the levels concerned: ground level (9/2), 400-keV level (7/2), 830-keV level (9/2), and 1 100-keV level (7/2). These spins are the only ones consistent with the experimental evidence and the theoretical arguments presented.

STUDY OF THE 20O(d,t) REACTION WITH THE TIARA-MUST2-VAMOS-EXOGAM SETUP

2009 ◽  
Vol 18 (10) ◽  
pp. 2056-2060 ◽  
Author(s):  
A. RAMUS ◽  
N. L. ACHOURI ◽  
H. AL FALOU ◽  
N. I. ASHWOOD ◽  
D. BEAUMEL ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Gamma Rays ◽  
Level Scheme ◽  
Inverse Kinematics ◽  
Charged Particles ◽  
Radioactive Beam ◽  
Neutron Transfer ◽  
Preliminary Results ◽  
The One ◽  
Light Charged Particles

The reaction 20 O ( d , t ) has been studied in inverse kinematics using a secondary radioactive beam produced with the SPIRAL facility at GANIL. Fragments, light charged particles and gamma rays were measured with the TIARA, MUST2, VAMOS and EXOGAM detectors and preliminary results are reported. The level scheme of 19 O is built and the spin and parity of one state is tentatively assigned using the one-neutron transfer angular distribution.

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

1972 ◽  
Vol 50 (22) ◽  
pp. 2741-2752 ◽  
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.

Low-energy level scheme of 46Sc deduced from the 45Sc(n, γ)46Sc capture gamma rays

1966 ◽  
Vol 84 (3) ◽  
pp. 661-672 ◽  
Author(s):  
P. van Assche ◽  
U. Gruber ◽  
B.P. Maier ◽  
H.R. Koch ◽  
O.W.B. Schult
Keyword(s):  
Energy Level ◽  
Gamma Rays ◽  
Level Scheme ◽  
Low Energy ◽  
Energy Level Scheme

The radioactive decay series 138Nd → 138Pr → 138Ce

1970 ◽  
Vol 48 (14) ◽  
pp. 2151-2157 ◽  
Author(s):  
James J. Hogan
Keyword(s):  
Direct Measurement ◽  
Gamma Rays ◽  
Radioactive Decay ◽  
Excited Level ◽  
Branching Ratio ◽  
Decay Chain ◽  
Decay Series

Measurements of the energies and intensities of gamma rays associated with decay of 138Nd, 138Prm, and 138Prg have been performed using a Ge(Li) detector. The branching ratio to a previously unreported excited level of 138Pr (328.1 keV) has been measured, thus allowing for direct measurement of the decay of 138Nd. Half-lives of 2.20 ± 0.07 and 5.04 ± 0.09 h have been measured for 138Prm and 138Nd, respectively. Decay schemes for 138Prm → 138Ce and for the decay chain 138Nd → 138Prg → 138Ce are proposed.

14.—Ground State Rotational Bands in 158Dy, 160Dy and 162Dy

1972 ◽  
Vol 70 ◽  
pp. 155-163 ◽  
Author(s):  
G. T. Ewan ◽  
G. I. Andersson
Keyword(s):  
Gamma Rays ◽  
Ground State ◽  
Gamma Ray ◽  
Angular Distributions ◽  
Rotational Bands ◽  
Weak Evidence ◽  
Gamma Coincidence ◽  
Inertia Model ◽  
Coincidence Spectra ◽  
Variable Moment

SynopsisLevels in the ground state bands of 158Dy, 160Dy and 162Dy have been populated by (α, 2n) reactions on metallic targets of separated 156Gd, 158Gd and 160Gd isotopes. Two Ge(Li) detectors were used to study singles gamma-ray spectra, gamma-ray angular distributions, gamma-gamma coincidence spectra and relative yields of gamma-rays for bombarding energies from 20 to 27 MeV. Transitions from all levels in the ground state bands up to the 12+ member were identified and the following level energies in keV established: 158Dy: 0 (0+), 99·0 (2+), 317·4 (4+), 637·9 (6+), 1044·1 (8+), 1520·1 (10+) and 2049·4 (12+); 160Dy: 0 (0+), 86·7 (2+), 283·7 (4+), 581·4 (6+), 967·4 (8+), 1429·0 (10+), 1951·7 (12+); 162Dy: 0 (0+), 80·7 (2+), 265·7 (4+), 548·5 (6+), 921·1 (8+), 1374·8 (10+) and 1901·0 (12+). There is weak evidence for the 14+ levels in 158Dy and 160Dy. The level energies are compared with calculated values using the variable moment of inertia model.

Gamma transitions in the decay of 75Se

1977 ◽  
Vol 55 (22) ◽  
pp. 2036-2039 ◽  
Author(s):  
Rajendra Prasad
Keyword(s):  
Gamma Rays ◽  
Level Scheme ◽  
Coincidence Circuit ◽  
Coincidence Spectrometer ◽  
Gamma Transitions

Gamma transitions following the decay of 75Se have been studied using a Ge(Li) detector and a NaI(Tl)–NaI(Tl) sum-coincidence spectrometer, used in conjunction with a slow-fast coincidence circuit. Two new gamma rays of energy 373.5 and 556.4 keV have been observed and confirmed in the level scheme of 75As. Ambiguous gamma transitions of 249.2, 468.6, 542.2, and 821.6 keV energies have also been confirmed. No evidence was found for the existence of 269.0, 293.0, and 308.0 keV transitions. The accurate intensities for various transitions have been determined.

Note on the decay of 43K

1969 ◽  
Vol 47 (14) ◽  
pp. 1539-1542 ◽  
Author(s):  
H. W. Taylor ◽  
J. D. King ◽  
H. Ing ◽  
R. J. Cox
Keyword(s):  
Gamma Rays ◽  
Level Scheme ◽  
Direct Evidence

The gamma rays emitted by radioactive 43K have been observed with a Ge(Li) spectrometer. Gamma rays with energies (intensities) of 219.2 ± 0.7(8 ± 3), 373.0 ± 0.5(101 ± 5), 397.8 ± 1.0 (11 ± 3), 592.5 ± 1.2 (10 ± 2), and 617.2 ± 0.5 (81 ± 5) keV have been identified. No direct evidence was found for gamma rays with energies of 388 and 1005 keV. A level scheme for 43Ca was constructed with levels at 373.0 ± 0.5, 592.4 ± 0.8, and 990.2 ± 0.7 keV.

Spreading width of compound states through coincidence spectra of rotational gamma-rays

1999 ◽  
Vol 465 (1-4) ◽  
pp. 1-7 ◽  
Author(s):  
M. Matsuo ◽  
T. Døssing ◽  
B. Herskind ◽  
S. Leoni ◽  
E. Vigezzi ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Spreading Width ◽  
Coincidence Spectra
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