LIFETIME OF THE 3.85-MEV LEVEL IN C13

1962 ◽  
Vol 40 (6) ◽  
pp. 769-774 ◽  
Author(s):  
J. J. Simpson ◽  
F M. A. Clark ◽  
A. E. Litherland
Keyword(s):  
Relative Intensity ◽  
Doppler Shift ◽  
Weak Coupling ◽  
Theoretical Calculations ◽  
Ground Level ◽  
Coupling Model ◽  
Doppler Shift Attenuation ◽  
Doppler Shift Attenuation Method ◽  
Strength Formula ◽  
Measured Transition

The lifetime of the 3.85-Mev level in C13 has been measured by the Doppler shift attenuation method and has been found to be [Formula: see text] second. This lifetime together with the (9.3 ± 2.0) × 10−3 relative intensity of the E2 branch from this level implies a strength [Formula: see text] in Weisskopf units for this transition. It is also found that the primarily M2 transition to the ground level of C13 has [Formula: see text] and the E1 transition to the 3.68-Mev level has [Formula: see text]. The measured transition strengths are compared with recent theoretical calculations based upon the weak-coupling model.

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.

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

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

scholarly journals Lifetime Measurements with the Doppler Shift Attenuation Method Using a Thick Homogeneous Production Target --- Verification of the Method

2017 ◽  
Vol 48 (3) ◽  
pp. 325 ◽  
Author(s):  
A. Ertoprak ◽  
B. Cederwall ◽  
U. Jakobsson ◽  
B.M. Nyakó ◽  
J. Nyberg ◽  
...  
Keyword(s):  
Doppler Shift ◽  
Lifetime Measurements ◽  
Doppler Shift Attenuation ◽  
Homogeneous Production ◽  
Doppler Shift Attenuation Method ◽  
Production Target

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
Sign in / Sign up

Export Citation Format

Share Document