Energy levels of excited in the decay of the 94Tcm,g isomeric pair

1969 ◽  
Vol 47 (9) ◽  
pp. 995-1003 ◽  
Author(s):  
J. Barrette ◽  
A. Boutard ◽  
S. Monaro
Keyword(s):  
Solid State ◽  
Excited States ◽  
Gamma Rays ◽  
Level Scheme ◽  
Coulomb Excitation ◽  
Energy Levels ◽  
Isomeric Pair ◽  
Solid State Detectors ◽  
Γ Ray ◽  
Type Detector

The γ-ray spectra resulting from the decay of the 94Tcm,g isomeric pair to the excited states of 94Mo have been investigated using Ge(Li) solid state detectors. Gamma rays (relative intensities are in parentheses) of 871.05(100); 993.19(2.35); 1196.4(0.80); 1522.1 (4.80); 1868.68(6.10); 2393.2(0.50); 2529.8(0.33); 2740.1(3.74); 3129.1(1.47); 3512.5(0.06); 3793.1(0.05); 3892.7(0.016); plus several other weak lines have been observed in the decay of 94Tcm(52 min). Gamma rays (relative intensities are in parentheses) of 449.2(3.3); 532.1(2.35); 702.67(99.7); 742.3(1.21); 849.74(95.8); 871.05(100); 961.10(7.6); 1509.3(0.68); 1592.1(2.25); 1765.6(0.29) have been detected in the decay of 94Tcg(5 h). To investigate this latter activity a hollow coaxial Ge(Li) spectrometer was also used as a well-type detector in order to obtain sum spectra of coincident gamma rays. The overall results obtained from this study allows construction of a level scheme of 94Mo which compares fairly well with previous investigations and removes some inconsistencies shown in Coulomb excitation measurements.

Energy levels of excited in the decay of the isomeric pair and

1968 ◽  
Vol 46 (21) ◽  
pp. 2375-2397 ◽  
Author(s):  
S. Monaro ◽  
J. Barrette ◽  
A. Boutard
Keyword(s):  
Gamma Rays ◽  
Energy Levels ◽  
Correlation Coefficients ◽  
Coincidence Circuit ◽  
Isomeric Pair ◽  
Γ Ray

The γ-ray spectra accompanying the decay of 96gTc (4.3 d) and 96mTc (52 m), produced in the reactions 96Mo (p, n) 96Tc and 97Mo (p, 2n) 96Tc, have been studied with lithium-drifted Ge detectors.Gamma rays (relative intensities are in parentheses) of 314.2 ± 0.2 (2.4), 316.3 ± 0.2 (1.5), 434.8 ± 0.4 (0.8), 460.2 ± 0.4 (0.48), 568.9 ± 0.4 (.95), 778.2 ± 0.2 (100), 812.5 ± 0.2 (83), 849.8 ± 0.2 (98), 1091.3 ± 0.4(0.9), 1126.8 ± 0.3 (15.3), 1200.0 ± 0.4 (0.41), and 1497.7 ± 0.5 keV (0.081), plus several other very weak lines, have been observed in the decay of 96Tc (4.3 d). Several transitions never previously reported were found in the decay of 96mTc (52 m). All but four of these transitions could fit already known excited levels in 96Mo at 778.2, 1497.9, 1628.0, 1869.6, and 1978.3 keV, whereas the placing of the remaining 616.1-, 966.6-, 1096.6-, and 1816.2-keV gamma rays required the existence of a new level in 96Mo at 2594.5 keV.In view of the results obtained from the study of the decay of the 96Tc isomeric pair, it was considered very desirable to reinvestigate the decay of 96Nb to levels in 96Mo. The 96Nb source was produced in the reaction 96Zr (p, n) 96Nb. Ge(Li) detectors were again employed and gamma–gamma directional correlation measurements were performed with two NaI(Tl) crystals, a fast coincidence circuit, and a multiparameter analyzer to record the data.The experimental directional correlation coefficients of the 1200.1–778.2, 1200.1–460.1, 778.2–460.1, 1091.4–778.2, 1091.4–568.7, and 778.2–568.7 keV cascades are[Formula: see text]respectively.These values seem to be compatible with spin assignments of 4+, 3+, and 5+ for the 1869.6-, 1978.3-, and 2438.4-keV levels in 96Mo respectively.

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 lying levels in 81Br

1969 ◽  
Vol 47 (20) ◽  
pp. 2255-2259 ◽  
Author(s):  
M. Salomon ◽  
C. Hojvat
Keyword(s):  
Excited State ◽  
Energy Level ◽  
Excited States ◽  
Ground State ◽  
Level Scheme ◽  
Coulomb Excitation ◽  
Transition Probability ◽  
Energy Level Scheme ◽  
First Excited State

Coulomb excitation of Br targets and the reaction 80Se(p,γ)81Br were used to populate the low lying excited states of 81Br and an energy level scheme is proposed. The reduced transition probability from the ground state to the first excited state of 81Br (276 keV) has been measured to be B(E2) = 410 ± 40 e2 f4.

scholarly journals Level Scheme of 102In first observed

2019 ◽  
Vol 3 ◽  
pp. 215
Author(s):  
E. Adamides ◽  
D. Seweryniak ◽  
B. Cederwal ◽  
J. Nyberg ◽  
C. Fahlander ◽  
...  
Keyword(s):  
Excited States ◽  
Level Scheme ◽  
Liquid Scintillator ◽  
Spectroscopic Methods ◽  
Nuclear Shell Model ◽  
Angular Correlations ◽  
Γ Ray ◽  
First Time ◽  
Nuclear Shell ◽  
Α Particles

Neutron deficient nuclei close to 100Sn have been investigated in-beam by particle and γ-ray spectroscopic methods using the NORDBALL detector array following the bombartment of a 54Fe target with a beam of 270 MeV 58Ni. Protons and α particles were identified with a 4π ΔΕ-type Si-multidetector and neutrons with a 1π liquid-scintillator-detectorassembly placed in the forward derection. Excited states of 102In were identified for the first time. The level scheme constructed from γ-γ-particle-coincidence and γ angular correlations is discussed and compared to the structure of neighboring nuclei in the framework of the nuclear shell model.

LOW-SPIN STATES OF 83Rb EXCITED IN THE 83Sr(β++EC)83Rb DECAY

2000 ◽  
Vol 09 (06) ◽  
pp. 471-485 ◽  
Author(s):  
XIAOHAN YU ◽  
SHUANGHUI SHI ◽  
JIAHUI GU ◽  
JINGYI LIU ◽  
WENXIN LI ◽  
...  
Keyword(s):  
Excited States ◽  
Gamma Rays ◽  
Half Life ◽  
Beam Energy ◽  
Decay Scheme ◽  
Branching Ratios ◽  
Spin States ◽  
New Information ◽  
Hpge Detectors ◽  
Γ Ray

Gamma-rays from the 83 Sr (β++ EC )83 Rb decay have been investigated with Compton suppressed HpGe detectors. The activity was produced via the 85 Rb (p,3n) reaction at 27.1 MeV beam energy. Singles in multispectra mode and γ–γ coincidence experiments were performed. Approximately 190 transitions including 94 new transitions and 19 new levels were assigned to 83 Rb , based on their measured half-life and/or observation in coincidence with well-known lines. A decay scheme has been constructed consisting of 41 excited states and 180 transitions in 83 Rb . Additional new information has been obtained on γ-ray branching ratios, log ft values, spins and parities.

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.

Excited States in 53Mn by the 53Cr(p,nγ)53Mn Reaction

1973 ◽  
Vol 51 (17) ◽  
pp. 1840-1849 ◽  
Author(s):  
Woon-Hyuk Chung ◽  
D. M. Sheppard ◽  
W. C. Olsen ◽  
B. C. Robertson
Keyword(s):  
Statistical Model ◽  
Excited States ◽  
Energy Levels ◽  
Branching Ratios ◽  
Angular Distributions ◽  
Reaction Energy ◽  
Yield Curves ◽  
Mixing Ratios ◽  
Doppler Shift Attenuation ◽  
Γ Ray

The properties of the low-lying excited states in 53Mn were studied by measuring γ-ray angular distributions and lifetimes using the 53Cr(p,nγ)53Mn reaction. Energy levels of 53Mn have been found at 0.378, 1.288, 1.440, 1.619, 2.272, 2.405, 2.572, 2.670, 2.687, 2.705, 2.872, 2.876, 2.914, 2.947, 3.005, 3.095, 3.125, 3.183, 3.193, and 3.250 MeV. The measurement of γ-ray angular distributions and yield curves together with predictions based on the compound nuclear statistical model have enabled spin assignments to be made to the following excited states in 53Mn: 1.440 MeV (11/2), 1.619 MeV (9/2), 2.572 MeV (7/2), 2.687 MeV (7/2), 2.947 MeV (9/2), 3.005 MeV (5/2). Multipole mixing ratios and branching ratios were determined for some of the observed transitions. Lifetimes of nine excited states in 53Mn have been measured using the Doppler-shift attenuation method.

Coulomb excitation of 35Cl projectiles

1969 ◽  
Vol 47 (10) ◽  
pp. 1065-1075 ◽  
Author(s):  
O. Häusser ◽  
D. Pelte ◽  
T. K. Alexander ◽  
H. C. Evans
Keyword(s):  
Excited States ◽  
Cross Section ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Coulomb Excitation ◽  
Coupling Model ◽  
Absolute Cross Section ◽  
Mixing Ratio ◽  
Lineshape Analysis ◽  
Doppler Shift Attenuation

Coulomb excitation of the first two excited states in 35Cl was studied by bombarding thick foils of 24Mg and carbon with 35Cl ions of energies between 51 and 61 MeV. De-excitation gamma rays were observed in two 40 cm3 Ge(Li) detectors. From absolute cross-section measurements the following B(E2) values were obtained, B(E2, 0 → 1220) = (0.081 ± 0.009) × 10−50 e2 cm4 and B(E2, 0 → 1762) = (1.17 ± 0.09) × 10−50 e2 cm4. The mixing ratio δ(1762 → 0) was measured to be −2.95 ± 0.45 which can be combined with the corresponding B(E2) value to yield τ(1762) = (0.555 ± 0.050) ps. A Doppler shift attenuation method was employed to interpret the observed gamma-ray lineshapes in terms of nuclear lifetimes. The lineshape analysis yielded τ(1220) = (0.16 ± 0.05) ps and confirmed τ(1762) obtained from the absolute cross-section measurements. The results provide evidence that the three lowest states in 35Cl cannot be interpreted by a weak coupling model.

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