scholarly journals Lifetimes of States in 62,64Cu and 67,70Ga

1974 ◽  
Vol 27 (2) ◽  
pp. 147 ◽  
Author(s):  
LE Carlson ◽  
MR Najam ◽  
WF Davidson ◽  
WM Zuk ◽  
RAI Bell ◽  
...  
Keyword(s):  
Lower Limit ◽  
Doppler Shift ◽  
Doppler Shift Attenuation ◽  
Doppler Shift Attenuation Method ◽  
Lower Limits

The Doppler shift attenuation method of lifetime determination has been employed following the 62.6 4 Ni(p, ny)62.6 4 Cu and 67. 70Zn(p, ny)67. 70Ga reactions. The lifetime of the 62CU state at 637 keY was found to be 220 :':1~g fs; lower limits of 230 and 250 fs were set for the levels at 426 and 548 keYrespectively. For 64 CU, a lower limit of 175 fs was set for both the 609 and 663 keY states. Lifetimes in 67Ga were determined for the indicated levels as: 828 keY, 280 +igg fs; 911 keY, 370 :,:~~g fs; 1412 keY, 900 :,:~~go fs; 1519 keY, 750 :,:!ggo fs; 1555 keY, 190 :,:~g fs; 1639 keY, 150 :,:!g fs; 2041 keY, 150 :,:~g fs; and 2174 keY, 80 :':jg fs. Lower limits of 600 and 110 fs were set on the lifetime values for the 1202 and 1978 keY levels respectively. Similarly, lower limits on the lifetimes of the 70Ga levels at 1203 and 1245 keY were set at 320 and 720 fs, while values for the 1312 and 1446 keY levels of 70Ga were found to be 245 :':~~ and 390 :':~~~ fs.

Properties of the 9.699 MeV level in 28Si

1969 ◽  
Vol 47 (16) ◽  
pp. 1725-1729 ◽  
Author(s):  
N. Anyas-Weiss ◽  
A. M. Charlesworth ◽  
L. E. Carlson ◽  
K. P. Jackson ◽  
R. E. Azuma
Keyword(s):  
Lower Limit ◽  
Gamma Rays ◽  
Large Volume ◽  
Doppler Shift ◽  
Branching Ratios ◽  
Doppler Shift Attenuation ◽  
Doppler Shift Attenuation Method

The decay of the 9.699 MeV level in 28Si has been studied using the reaction 27Al(p,γ)28Si at Ep = 1724 keV. Gamma rays from the decay of the 9.699 MeV level were observed with large-volume Ge(Li) detectors. Branching ratios for the decay of the 9.699 MeV level have been obtained and a lower limit for the lifetime of this level has been measured to be [Formula: see text] using the Doppler-shift attenuation method.

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.

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.

Lifetime measurements by the Doppler-shift attenuation method in theSn115(α,nγ)Te118reaction

2011 ◽  
Vol 83 (5) ◽  
Author(s):  
C. Mihai ◽  
A. A. Pasternak ◽  
S. Pascu ◽  
D. Filipescu ◽  
M. Ivaşcu ◽  
...  
Keyword(s):  
Doppler Shift ◽  
Lifetime Measurements ◽  
Doppler Shift Attenuation ◽  
Doppler Shift Attenuation Method

Mesures de vies moyennes dans 12B, 14N et 16O

1970 ◽  
Vol 48 (13) ◽  
pp. 1595-1606 ◽  
Author(s):  
A. Gallmann ◽  
F. Haas ◽  
N. Balaux ◽  
B. Heusch ◽  
M. Toulemonde
Keyword(s):  
Wave Function ◽  
Doppler Shift ◽  
Partial Width ◽  
Transition Energies ◽  
Radiative Transitions ◽  
Upper Limits ◽  
Doppler Shift Attenuation ◽  
Theoretical Predictions ◽  
Doppler Shift Attenuation Method ◽  
Gamma Radiations

Lifetimes of nuclear states have been measured by the Doppler-shift attenuation method. Gamma radiations from the 11B(d,pγ)12B, 19F(p,αγ)16O, and 12C(h,pγ)14N reactions were observed with a Ge(Li) detector at θγ = 7°, 90° and 173°. The following lifetimes were obtained:[Formula: see text]Upper limits have been set for very fast lifetimes, and transition energies were also determined. The partial widths of the radiative transitions from the 6.44 MeV state of 14N were compared with theoretical predictions. The amplitude of a (p3/2)−2 configuration in the wave function of this level was evaluated using the partial width of the 6.44 → 3.95 MeV transition determined in the present work.

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

1964 ◽  
Vol 8 (1) ◽  
pp. 52-53 ◽  
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

Lifetimes of Excited Levels in $^{32}$S from the Doppler Shift Attenuation Method

2000 ◽  
Vol 37 (5) ◽  
pp. 512-518 ◽  
Author(s):  
T. K. Yang ◽  
S. T. Park ◽  
B. K. Seo ◽  
H. C. Kim ◽  
D. W. Lee ◽  
...  
Keyword(s):  
Doppler Shift ◽  
Doppler Shift Attenuation ◽  
Doppler Shift Attenuation Method
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