The 7/2− Doublet in 55Fe

1975 ◽  
Vol 53 (23) ◽  
pp. 2631-2638 ◽  
Author(s):  
B. C. Robertson ◽  
M. Micklinghoff ◽  
B. Castel
Keyword(s):  
Doppler Shift ◽  
Model Analysis ◽  
Experimental Information ◽  
Doppler Shift Attenuation ◽  
Coupling Calculation

An investigation of the Jπ = 7/2− states at 1316 and 1408 keV excitation in 55Fe is presented as a test of the coexistence of particle and hole states in that nucleus. The lifetimes were measured using the solid stopper Doppler shift attenuation technique, yielding values of [Formula: see text] and τ > 4 ps for the 1316 and 1408 keV levels respectively. The 1408 → 1316 keV branch was determined to be 2.5 ± 0.5%. The results are compared with other available experimental information and with the predictions of a quasiparticle–core coupling calculation. The model analysis indicates very limited mixing of particle and hole configurations.

scholarly journals Gamma-ray Studies using a Solid Argon Target: Properties of States in 40K and 40Ar

1979 ◽  
Vol 32 (3) ◽  
pp. 195 ◽  
Author(s):  
DJ Beale ◽  
AR Poletti ◽  
JR Southon
Keyword(s):  
Angular Distribution ◽  
Doppler Shift ◽  
Weak Coupling ◽  
Gamma Ray ◽  
Interaction Model ◽  
Substantial Agreement ◽  
Mixing Ratios ◽  
Doppler Shift Attenuation ◽  
Coupling Calculation ◽  
Solid Argon

The Doppler shift attenuation method was used to deduce lifetimes of levels in 40 Ar and 4�K populated by the reactions 40 Ar(p, n)4�K and 40 Ar(p, p')40 Ar. Spins and mixing ratios in 4�K were also deduced from angular distribution measurements. The target used was solid argon at a temperature of 66 K. Substantial agreement with other recent work has been found. The results are interpreted using a weak coupling calculation and a simple t5 function interaction model.

Doppler-Shift Attenuation Measurements of Lifetimes for (2s,1d)-Shell Nuclei Excited by Heavy-Ion Bombardment ofH2

1973 ◽  
Vol 7 (3) ◽  
pp. 1120-1132 ◽  
Author(s):  
E. K. Warburton ◽  
J. W. Olness ◽  
G. A. P. Engelbertink ◽  
T. K. Alexander
Keyword(s):  
Doppler Shift ◽  
Ion Bombardment ◽  
Heavy Ion ◽  
Doppler Shift Attenuation

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

1965 ◽  
Vol 66 (2) ◽  
pp. 401-418 ◽  
Author(s):  
M.A. Eswaran ◽  
H.E. Gove ◽  
A.E. Litherland ◽  
C. Broude
Keyword(s):  
Excited States ◽  
Doppler Shift ◽  
Doppler Shift Attenuation

scholarly journals A Search for an Excited Kp=0+ Rotational Band in 24Mg

1976 ◽  
Vol 29 (3) ◽  
pp. 139 ◽  
Author(s):  
D Branford ◽  
LE Carlson ◽  
FCP Huang ◽  
N Gardner ◽  
TR Ophel ◽  
...  
Keyword(s):  
Shell Model ◽  
Quadrupole Moment ◽  
Rotational Band ◽  
Doppler Shift ◽  
Transition Rates ◽  
Model Calculations ◽  
Doppler Shift Attenuation ◽  
Doppler Shift Attenuation Method ◽  
Absolute Transition ◽  
Good Agreement

A search is described for an excited Kn = 0+ rotational band based on the 6� 44 MeV level of 24Mg. Mean nuclear lifetimes have been measured by the Doppler shift attenuation method using the 12C('60,a)24Mg reaction and the results are 't'm = 66�29, 28�7 and 13�3 fs for levels at 6'44, 8�65 and 10� 58 MeV respectively. The absolute transition rates found for the y decays from the 6�44 and 8�65 MeV levels are in good agreement with the results of shell model calculations if it is assumed that these levels are the 0+ and 2 + members respectively of the excited Kn = 0+ rotational band. Based on this assumption, a result Qoo = 0�48 �0�08b is obtained for the intraband quadrupole moment. From a study of the 23Na(p, y) reaction, it is established that the J = 4 levels at 12� 63 and 13�05 MeV do not decay by enhanced E2 transitions to the 8� 65 MeV level. This suggests that neither of these levels is the 4 + member of the excited Kn = 0+ rotational band. An assignment of J" = 4+ is made to one member of the doublet at 10�58 MeV.

Angle-corrected doppler-shift attenuation analysis

1997 ◽  
Author(s):  
S. L. Tabor ◽  
R. A. Kaye ◽  
G. N. Sylvan
Keyword(s):  
Doppler Shift ◽  
Doppler Shift Attenuation

LIFETIME MEASUREMENTS OF STATES IN O18 AND Ne22

1964 ◽  
Vol 42 (6) ◽  
pp. 1311-1323 ◽  
Author(s):  
M. A. Eswaran ◽  
C. Broude
Keyword(s):  
Excited State ◽  
Ground State ◽  
Doppler Shift ◽  
State Transition ◽  
Branching Ratios ◽  
Ground State Transition ◽  
Lifetime Measurements ◽  
Doppler Shift Attenuation ◽  
First Excited State ◽  
Doppler Shift Attenuation Method

Lifetime measurements have been made by the Doppler-shift attenuation method for the 1.98-, 3.63-, 3.92-, and 4.45-Mev states in O18 and the 1.28-, 3.34-, and 4.47-Mev states in Ne22, excited by the reactions Li7(C12, pγ)O18 and Li7(O16, pγ)Ne22. Branching ratios have also been measured. The results are tabulated.[Formula: see text]The decay of the 3.92-Mev state in O18 is 93.5% to the 1.98-Mev state and 6.5% to the ground state and of the 4.45-Mev state 74% to the 3.63-Mev state, 26% to the 1.98-Mev state, and less than 2% to the ground state. In Ne22, the ground-state transition from the 4.47-Mev state is less than 2% of the decay to the first excited state.

Measurement of the 21+ level lifetime in Sn120 by the Doppler shift attenuation method: Evidence of enhanced collectivity

2019 ◽  
Vol 100 (3) ◽  
Author(s):  
A. Kundu ◽  
S. Santra ◽  
A. Pal ◽  
D. Chattopadhyay ◽  
R. Raut ◽  
...  
Keyword(s):  
Doppler Shift ◽  
Level Lifetime ◽  
Doppler Shift Attenuation ◽  
Method Evidence ◽  
Doppler Shift Attenuation Method

Lifetimes of three levels in 22Na measured by the doppler shift attenuation in gases

1968 ◽  
Vol 107 (2) ◽  
pp. 411-416 ◽  
Author(s):  
A.E. Blaugrund ◽  
A. Fisher ◽  
A. Schwarzschild
Keyword(s):  
Doppler Shift ◽  
Doppler Shift Attenuation
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