An examination of Doppler shift attenuation factors and lifetimes for excited nuclear states in 59Cu and 63Cu

B. E. Cooke; J. R. Leslie; W. McLatchie; P. Skensved

doi:10.1139/p80-051

An examination of Doppler shift attenuation factors and lifetimes for excited nuclear states in 59Cu and 63Cu

Canadian Journal of Physics ◽

10.1139/p80-051 ◽

1980 ◽

Vol 58 (3) ◽

pp. 359-362 ◽

Cited By ~ 6

Author(s):

B. E. Cooke ◽

J. R. Leslie ◽

W. McLatchie ◽

P. Skensved

Keyword(s):

Energy Loss ◽

Excited States ◽

Doppler Shift ◽

Speed Of Light ◽

Proton Capture ◽

Doppler Shift Attenuation ◽

Resonance Strengths ◽

Γ Rays ◽

Standard Energy ◽

Existing Data

Excited states in 59Cu and 63Cu have been studied with radiative proton capture. Doppler shift attenuation factors have been measured for γ-rays depopulating these states, with ion recoil speeds of approximately 0.1% of the speed of light. Measurements of resonance strengths reported here, together with existing data from other techniques, have been used to deduce lifetimes for the same states. For five cases where the DSA factors and the lifetimes have been determined independently, consistency with DSAM theory is optimized when the standard energy loss value is multiplied by a factor of 0.94 ± 0.11.

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Lifetimes of excited states in Cu63, Cu65, Ni62 and Fe56 by Doppler shift attenuation measurements

Nuclear Physics ◽

10.1016/0029-5582(65)90188-4 ◽

1965 ◽

Vol 66 (2) ◽

pp. 401-418 ◽

Cited By ~ 38

Author(s):

M.A. Eswaran ◽

H.E. Gove ◽

A.E. Litherland ◽

C. Broude

Keyword(s):

Excited States ◽

Doppler Shift ◽

Doppler Shift Attenuation

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EVIDENCE FOR X(5) CRITICAL POINT SYMMETRY IN 128Ce

International Journal of Modern Physics E ◽

10.1142/s0218301306005538 ◽

2006 ◽

Vol 15 (08) ◽

pp. 1735-1740 ◽

Cited By ~ 5

Author(s):

D. L. BALABANSKI ◽

K. A. GLADNISHKI ◽

G. LO BIANCO ◽

A. SALTARELLI ◽

N. V. ZAMFIR ◽

...

Keyword(s):

Critical Point ◽

Nuclear Structure ◽

Excited States ◽

Ground State ◽

Doppler Shift ◽

Point Symmetry ◽

Yale University ◽

Doppler Shift Attenuation ◽

Recoil Distance ◽

Predicted Values

Lifetimes of excited states in 128 Ce were measured using the recoil distance Doppler-shift (RDDS) and the Doppler-shift attenuation (DSAM) methods. The experiments were performed at the Wright Nuclear Structure Laboratory of Yale University. Excited states of 128 Ce were populated in the 100 Mo (32 Si ,4 n ) reaction at 120 MeV and the nuclear γ decay was measured with an array of eight Clover detectors positioned at forward and backward angles. The deduced yrast transition strengths together with the energies of the levels within the ground-state (gs) band of 128 Ce are in agreement with the predicted values for the X (5) critical point symmetry. Thus, we suggest 128 Ce as a benchmark X (5) nucleus in the mass A ≈ 130 region.

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Measurement of lifetimes of nuclear excited states by doppler shift attenuation method

Physics Letters ◽

10.1016/0031-9163(64)90796-6 ◽

1964 ◽

Vol 8 (1) ◽

pp. 52-53 ◽

Cited By ~ 5

Author(s):

M.A. Eswaran ◽

H.E. Gove ◽

A.E. Litherland ◽

C. Broude

Keyword(s):

Excited States ◽

Doppler Shift ◽

Doppler Shift Attenuation ◽

Doppler Shift Attenuation Method

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Symmetries in mirror nuclei 31S and 31P

EPJ Web of Conferences ◽

10.1051/epjconf/201819403001 ◽

2018 ◽

Vol 194 ◽

pp. 03001

Author(s):

D. Tonev ◽

G. de Angelis ◽

N. Goutev ◽

S. Iliev ◽

R. Orlandi ◽

...

Keyword(s):

Charged Particle ◽

Excited States ◽

Doppler Shift ◽

Isospin Symmetry ◽

Particle Detector ◽

Lifetime Measurements ◽

Angular Correlations ◽

Doppler Shift Attenuation ◽

First Time

Excited states in mirror nuclei 31S and 31P were populated in the 1n and 1p exit channels, respectively, of the reaction 20Ne + 12C. The beam of 20Ne, with an energy of 33 MeV, was delivered for the first time by the Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro. Angular correlations of coincident pairs and Doppler-shift attenuation lifetime measurements in 31S and 31P were performed using the multidetector array GASP in conjunction with the EUCLIDES charged particle detector. A comparison of the determined B(E1) strengths of the analog mirror 7/2- → 5/2+ transitions indicates the presence of a violation of isospin symmetry.

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Lifetimes of Low Lying Levels of 18O, 18Ne

Canadian Journal of Physics ◽

10.1139/p74-184 ◽

1974 ◽

Vol 52 (15) ◽

pp. 1381-1388 ◽

Cited By ~ 19

Author(s):

A. B. McDonald ◽

T. K. Alexander ◽

O. Häusser ◽

G. J. Costa ◽

J. S. Forster ◽

...

Keyword(s):

Doppler Shift ◽

Transition Rates ◽

Distance Method ◽

Doppler Shift Attenuation ◽

Theoretical Predictions ◽

Γ Rays ◽

Recoil Distance

The T(16O,p)18O reaction has been employed to measure the lifetimes of the 1.98 MeV 2+ level (τ = 3.35 ± 0.20 ps) and the 3.55 MeV 4+ level (τ = 24.5 ± 3.3 ps) of 18O by the recoil distance method. The lifetime of the 1.89 MeV 2+ level of 18Ne (τ = 0.63 ± 0.13 ps) has been measured by observing the Doppler shift attenuation of γ rays from 18Ne ions recoiling from the 16O(3He,n) reaction into Y and Ta backings. Transition rates in these mirror nuclei are compared with theoretical predictions.

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Mesures de Rapports d'Embranchement et de Vies Moyennes dans 30Si

Canadian Journal of Physics ◽

10.1139/p72-043 ◽

1972 ◽

Vol 50 (3) ◽

pp. 278-286 ◽

Cited By ~ 6

Author(s):

A. Gallmann ◽

F. Haas ◽

M. Toulemonde

Keyword(s):

Shell Model ◽

Gamma Rays ◽

Doppler Shift ◽

Branching Ratios ◽

Matrix Elements ◽

Excitation Energies ◽

Doppler Shift Attenuation ◽

Annular Detector ◽

Γ Rays

Gamma rays from the decay of 30Si levels with excitation energies less than 6.0 MeV have been studied by the 27Al(α, pγ)30Si reaction. The γ rays were detected in a Ge(Li) detector in coincidence with protons observed in an annular detector placed at 180°. Branching ratios and lifetimes have been extracted. The lifetimes have been measured by the Doppler-shift attenuation method.The electromagnetic matrix elements for some of the observed levels were compared with recent many-particle shell model and core-coupling calculations.

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Study of 14N(ρ,γ)15O resonance reaction at Eplab= 278 keV

EPJ Web of Conferences ◽

10.1051/epjconf/202022702011 ◽

2020 ◽

Vol 227 ◽

pp. 02011

Author(s):

Sathi Sharma ◽

A. Gupta ◽

S. Das ◽

M. Roy Chowdhury ◽

A. Mandal ◽

...

Keyword(s):

Excited States ◽

Depth Profile ◽

Doppler Shift ◽

Proton Energy ◽

Lattice Structure ◽

Resonance State ◽

Narrow Resonance ◽

Experimental Profile ◽

Doppler Shift Attenuation ◽

Surface And Bulk Characterization

An implanted target (14N on Ta) is prepared and characterized via surface and bulk characterization processes. The depth profile of the implanted ions is obtained experimentally by populating a narrow resonance state of 15O through 14N(ρ,γ) reaction induced with a laboratory proton energy of 278 keV. The experimental profile is then compared with devoted simulations to under- stand the locations of the implantated ions in the lattice structure. Later, the lifetimes of a few excited states of 15O, relevant for applications in astrophys- ical scenario, have been determined using Doppler Shift Attenuation Method(DSAM).

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LIFETIME MEASUREMENTS OF EXCITED STATES IN 73As

International Journal of Modern Physics E ◽

10.1142/s0218301304002569 ◽

2004 ◽

Vol 13 (05) ◽

pp. 1019-1034 ◽

Cited By ~ 2

Author(s):

K. P. SINGH ◽

T. KAKAVAND ◽

M. HAJIVALIEI

Keyword(s):

Statistical Theory ◽

Excited States ◽

Doppler Shift ◽

Nuclear Reactions ◽

Angular Distributions ◽

Excitation Energies ◽

Lifetime Measurements ◽

Mixing Ratios ◽

Doppler Shift Attenuation ◽

First Time

The excited states of 73 As have been investigated via the 73 Ge ( p , n γ)73 As reaction with proton beam energies from 2.5–4.3 MeV. The lifetimes of the levels at 769.6, 860.5, 1177.8, 1188.7, 1274.9, 1344.1, 1557.1 and 1975.2 keV excitation energies have been measured for the first time using the Doppler shift attenuation method. The angular distributions have been used to assign the spins and the multipole mixing ratios using statistical theory for compound nuclear reactions. The ambiguity in the spin values for the various levels has been removed. The multipole mixing ratios for eight γ-transitions have been newly measured.

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Lifetime Measurements at NCSR “Demokritos”

HNPS Proceedings ◽

10.12681/hnps.2514 ◽

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.

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