Properties of the 4.038 MeV state in 25Al

1968 ◽  
Vol 46 (24) ◽  
pp. 2789-2796 ◽  
Author(s):  
H. Röpke ◽  
N. Anyas-Weiss ◽  
A. E. Litherland
Keyword(s):  
Decay Scheme ◽  
Previous Measurement ◽  
Proton Scattering ◽  
Parity Assignment ◽  
Attenuation Measurement ◽  
Mixing Ratios ◽  
Doppler Shift Attenuation ◽  
Inelastic Proton Scattering ◽  
Γ Rays ◽  
Γ Ray

The 4.038 MeV state in 25Al, which is also the Ep = 1.824 MeV resonance in the 24Mg(p,γ) reaction, has been investigated using the 24Mg(p,y) reaction. The γ-ray decay scheme is given and a limit of [Formula: see text], is obtained for the inelastic proton scattering width. Angular distribution measurements of deexcitation γ rays confirm previous values of radiation mixing ratios, but cannot remove the Jπ = 9/2+, 5/2+ ambiguity in the spin–parity assignment. A Doppler shift attenuation measurement of the4.038 MeV deexcitation γ ray yields ƒ(τ) = 0.91 ± 0.02, corresponding to a lifetime of τ(4.038) = 22 ± 6 fs. The particle widths are derived using the lifetime and a previous measurement of the γ-ray yield at the 24Mg, Ep = 1.824 MeV resonance. On the basis of the particle width, arguments are given for a Jπ = 9/2+ assignment to the 4.038 MeV state.

scholarly journals Lifetime Measurements at NCSR “Demokritos”

2020 ◽  
Vol 19 ◽  
pp. 41
Author(s):  
S. F. Ashley ◽  
M. Axiotis ◽  
V. Foteinou ◽  
S. Harrisopulos ◽  
T. Konstantinopoulos ◽  
...  
Keyword(s):  
Excited States ◽  
Proton Scattering ◽  
Lifetime Measurements ◽  
Values Development ◽  
Hpge Detectors ◽  
Doppler Shift Attenuation ◽  
Inelastic Proton Scattering ◽  
Γ Rays ◽  
Set Up ◽  
Good Agreement

Proof-of-principle inelastic proton scattering measurements have been performed at NCSR “Demokritos”. Excited states in 64Zn and 92Mo were populated using the (p,p'γ) reaction with E(p) = 7 MeV. The reaction γ rays were detected using four HPGe detectors at eight separate angles, with respect to the beam-axis. From Doppler-shift attenuation of the ∞ rays, lifetimes for eight excited states in 64Zn and for the Iπ = 2^+_2 and 2^+_3 states in 92Mo were deduced. The lifetimes measured in 92Mo are in good agreement with adopted values whereas the lifetimes measured in 64Zn are typically longer than the literature values. Development of the experimental set-up and potential novel physics cases where this reaction could be used are briefly discussed.

γ-ray production by inelastic proton scattering on16Oand12C

1998 ◽  
Vol 58 (4) ◽  
pp. 2174-2179 ◽  
Author(s):  
J. Kiener ◽  
M. Berheide ◽  
N. L. Achouri ◽  
A. Boughrara ◽  
A. Coc ◽  
...  
Keyword(s):  
Proton Scattering ◽  
Inelastic Proton Scattering ◽  
Γ Ray

Decay properties of 181Ir

1978 ◽  
Vol 56 (3) ◽  
pp. 321-326 ◽  
Author(s):  
I. M. Ladenbauer-Bellis ◽  
P. Sen ◽  
H. Bakhru
Keyword(s):  
Half Life ◽  
Decay Scheme ◽  
Heavy Ion ◽  
Heavy Ion Reactions ◽  
X Ray ◽  
Decay Properties ◽  
Helium Jet ◽  
Γ Rays ◽  
Ge Detector ◽  
Γ Ray

181Ir activity was produced via the following heavy-ion reactions: 169Tm (16O,4n)181Ir and 169Tm(19F,7n)181Pt (51 s) decaying to 181Ir. The half-life of 181Ir was found to be 4.90 ± 0.15 min. Singles and coincidence γ-ray measurements were performed using 30–40 cm3 Ge(Li) detectors. X-Ray measurements were carried out using an intrinsic Ge-detector. Additionally the helium jet system was used to study the properties of this isotope. The following γ rays were found to belong to the decay of 181Ir: 19.6, 65.3, 93.8, 107.6, 117.9, 123.5, 184.6, 189.9, 227.0, 231.6, 239.2, 309.0, 318.9, 350.5, 352.8, 375.2, 576.5, 700.1, 871.2, 1182.3, 1192.6, 1347.1, 1381.0, 1528.8, 1545.0, 1565.6, 1593.4, 1639.6, 1646.4, 1652.5, and 1714.9 keV. A tentative decay scheme is proposed for 181Ir, verifying levels in l8lOs that have been obtained by reaction work. The proposed decay scheme as well as spin and parity assignments of some of the 181Os levels are discussed.

Levels in 45Sc from Radiative Proton Capture in 44Ca

1974 ◽  
Vol 52 (2) ◽  
pp. 131-139 ◽  
Author(s):  
R. L. Schulte ◽  
J. D. King ◽  
H. W. Taylor
Keyword(s):  
Decay Scheme ◽  
Bound States ◽  
Gamma Ray ◽  
Angular Distributions ◽  
Distribution Data ◽  
Excitation Energies ◽  
Proton Capture ◽  
Resonant States ◽  
Γ Rays ◽  
Γ Ray

A total of 22 resonances has been observed in the 44Ca(p,γ)45Sc reaction within the incident proton energy range of 600 to 930 keV. Gamma-ray singles spectra and γ-ray angular distribution data were accumulated for resonances at Ep = 856 and 906 keV. Both of these resonant states have been found to have spin 3/2. The measured angular distributions of primary γ rays from the resonant states have given spin information on the intermediate bound states of 45Sc with excitation energies above 2 MeV. A γ-ray decay scheme has been derived from the γ-ray spectra. The data indicate new levels at 2151.0, 3525.2, 3548.5, 3584.0, and 3714.3 keV.

Gamma rays produced in the 209Bi(n, n′γ) reaction

1984 ◽  
Vol 62 (10) ◽  
pp. 948-962 ◽  
Author(s):  
W. V. Prestwich ◽  
T. J. Kennett ◽  
J. S. Tsai
Keyword(s):  
High Resolution ◽  
Gamma Rays ◽  
Energy Region ◽  
Weak Coupling ◽  
Decay Scheme ◽  
High Energy ◽  
High Energy Region ◽  
Γ Rays ◽  
Γ Ray ◽  
Resolution Study

A high-resolution study of the γ-ray spectrum induced by the inelastic scattering of reactor produced neutrons has been conducted. The γ rays observed have been assigned in a decay scheme involving 134 levels extending in excitation energy to 6 MeV. The results are discussed within the context of previously identified weak coupling configurations, and possible discrepancies are indicated. Levels in the high-energy region are also compared with recently reported photoexcitation studies.

NEW LEVELS AND TRANSITIONS IN 72Ge OBSERVED IN THE 72As(β++EC)72Ge DECAY

2008 ◽  
Vol 17 (06) ◽  
pp. 1061-1074
Author(s):  
SHUIFA SHEN ◽  
YAN LI ◽  
JIAHUI GU ◽  
FURONG XU ◽  
TINGDUN WEN ◽  
...  
Keyword(s):  
High Purity ◽  
Decay Scheme ◽  
Branching Ratios ◽  
Γ Rays ◽  
Γ Ray ◽  
First Time

The decay of 72 As has been investigated by means of γ-ray spectroscopy. The 72 As nuclei were produced through the 72 Ge (p, n)72 As reaction. The Compton-suppressed spectrometer and high-purity Ge detectors have been used in singles and in coincidence modes respectively to study γ-rays in the β++ EC decay of 72 As to 72 Ge . 79 γ-rays, among which 3 were observed for the first time, were reported. A decay scheme of 72 As including 1 new level is proposed that accommodates 77 of these transitions. Tentative spin and parity assignments are suggested for a number of levels according to the log ft values and γ-branching ratios.

THE NEW ISOTOPES Cd104 AND Ag104

1955 ◽  
Vol 33 (12) ◽  
pp. 841-855 ◽  
Author(s):  
F. A. Johnson
Keyword(s):  
Decay Scheme ◽  
Low Energy ◽  
Subsequent Growth ◽  
Chemical Methods ◽  
Line Intensities ◽  
In Series ◽  
Mcgill University ◽  
Positron Spectrum ◽  
Γ Rays ◽  
Γ Ray

Two new neutron deficient isotopes Cd104 (59 min.) and Ag104 (27 min.) have been produced by the reaction Ag107(p, 4n)Cd104 at 50 Mev. in the McGill University synchrocyclotron and by the subsequent growth of silver from the cadmium. These isotopes have been investigated by means of a 180° spectrograph of high resolution, a lens spectrometer, and a scintillation spectrometer. Chemical methods of identification have also been employed. Ag104 has been found to emit a positron spectrum of end point 2.70 ±.01 Mev. and a γ-ray of 556.2 kev. which is thought to be in series with the positron spectrum. The origin of a γ-ray of energy 118.4 kev. which appears to be converted in palladium is at present unknown. A tentative decay scheme is proposed. Cd104 appears to decay primarily by K-capture since no positron spectrum was observed which could be assigned to this isotope. Four γ-rays, of energies 66.7, 83.6, 123.6, and 134.2 kev., have been definitely assigned to this isotope on the basis of K−L differences shown by conversion lines; on the basis of relative L line intensities and K/L ratios the two low energy γ-rays have been shown to represent M1 transitions. Other conversion lines were found whose origin and element of conversion are unknown.

XVIII.—Energy Levels of B10: Evidence from the B10 γ-ray Spectrum.

1960 ◽  
Vol 65 (3) ◽  
pp. 247-262
Author(s):  
R. B. Galloway ◽  
R. M. Sillitto
Keyword(s):  
Decay Scheme ◽  
Energy Levels ◽  
Γ Rays ◽  
Γ Ray

SYNOPSISA study of the γ-rays produced during the bombardment of a thick Be9 target by 600 keV deuterons was made to investigate the possible existence of a level at 2·86 MeV in B10, about which contradictory reports have appeared in the literature.A spectrum of the γ-rays in coincidence with the 0·72 MeV B10 γ-ray (text-fig. 5) was obtained, and is interpreted as providing evidence for a level in B10 at 2·86 MeV. The relative intensities of the γ-rays in an ungated spectrum, and in spectra gated by the 0·72 and 1·02 MeV B10 γ-rays, were found, and a decay scheme consistent with the observations is deduced (text-fig. 6b). The relative intensities of the transitions in this decay scheme are consistent with the intensities of the neutron groups in a spectrum of the neutrons from this reaction. A spin value of 2 or 3 is suggested for the 2.86 MeV level.

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.

Band Structure in 21Ne

1972 ◽  
Vol 50 (12) ◽  
pp. 1286-1294 ◽  
Author(s):  
A. A. Pilt ◽  
R. H. Spear ◽  
R. V. Elliott ◽  
D. T. Kelly ◽  
J. A. Kuehner ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Band Structure ◽  
Linear Polarization ◽  
Negative Parity ◽  
Mixing Ratios ◽  
Decay Branch ◽  
Nilsson Model ◽  
Γ Rays ◽  
Model Evidence ◽  
Γ Ray

The 18O(α,nγ) reaction at α-particle bombarding energies of 5.2 and 6.1 MeV was used to study the levels in 21Ne below 4 MeV excitation. A combination of γ-ray angular distribution and linear polarization measurements using a single crystal Ge(Li) polarimeter confirmed the spins and parities of the 1747 and 2867 keV states to be 7/2+ and 9/2+ respectively and assigned negative parity to the J = 3/2 level at 3663 keV and J = 5/2 level at 3886 keV. The state at 3735 keV was shown to have Jπ = 5/2+. Values of the multipole mixing ratios of γ rays deexciting these states were found to be consistent with previous measurements. A γ–γ coincidence experiment revealed the existence of a (1.8 ± 0.7)% decay branch of the 3886 keV level to the 2790 keV level. The results are interpreted in terms of the Nilsson model. Evidence for the existence of a Kπ = 1/2− band based on a hole in the 1p1/2 shell is given.

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