scholarly journals Neutron Resonance Spectroscopy on 209Bi

1978 ◽  
Vol 31 (1) ◽  
pp. 47 ◽  
Author(s):  
AR de L Musgrove ◽  
JA Harvey
Keyword(s):  
P Wave ◽  
Neutron Resonance ◽  
Resonance Spectroscopy ◽  
S Wave ◽  
Electron Linear Accelerator ◽  
Oak Ridge ◽  
Show Evidence ◽  
Strength Functions ◽  
Energy Dependent ◽  
Bombarding Energy

The neutron transmission through 209Bi was measured with high resolution at both the 80 and 200 m stations of the Oak Ridge Electron Linear Accelerator. Resonance parameters for s-wave levels below 270 keY and for p-wave levels below 100 keY bombarding energy were obtained. Approximately 25 % of the expected neutron strength of a particle-vibrator doorway was identified in the energy range analysed for s-wave resonances. The average s-wave level spacing is s = 4�5 � 0�6 ke V after correcting for missed levels. The s- and p-wave neutron strength functions are respectively: 104 So = 0�65 � 0�15 (E < 170 keY); 104 Sl = o� 25 � 0�07 (E < 60 keY). Both strength functions show evidence of energy-dependent structure.

Neutron Resonance Parameters of 90Zr below 300 KeV

1977 ◽  
Vol 30 (4) ◽  
pp. 379 ◽  
Author(s):  
AR de L Musgrove ◽  
JA Harvey ◽  
WM Good
Keyword(s):  
Linear Accelerator ◽  
P Wave ◽  
Neutron Resonance ◽  
S Wave ◽  
Electron Linear Accelerator ◽  
Resonance Parameters ◽  
Oak Ridge ◽  
Wave Parameters ◽  
Transmission Data ◽  
Bombarding Energy

Transmission data taken at both the 80 and 200 m stations of the Oak Ridge Electron Linear Accelerator have provided resonance parameters for 90Zr to 300 keV bombarding energy. The average s-wave parameters obtained were: <D> = 8�6�1�6keY and So = (0�S4�0�14)x10-4 , while the average parameters for the two p-wave sequences were: for P1/2, <D> = 8�6 � 1 . 6 keY and SI = (3�9�1�0)x 10-4 ; for P3/2, <D> =o4�3�0�S keY and SI = (4�3�0�8)x 10-4 ?

scholarly journals keV Neutron Resonance Capture in Barium-137

1976 ◽  
Vol 29 (3) ◽  
pp. 157 ◽  
Author(s):  
AR de L Musgrove ◽  
BJ Allen ◽  
JW Boldeman ◽  
RL Macklin
Keyword(s):  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Strength Function ◽  
P Wave ◽  
Neutron Resonance ◽  
Resonance Capture ◽  
Level Spacing ◽  
S Wave ◽  
Radiative Width

The neutron capture cross section of 137Ba has been measured to high resolution (AE/E ~ o� 2 %) below En = 60 keY. Average values of resonance parameters, extracted for resonances in the range 2�7 < En < 12 keY, are as follows: s-wave level spacing <D) = 380� 70 eV; s-wave radiative width <Tv). = 80�15meV; s-wave neutron strength function 104 So = 0'57�0'2; and p-wave neutron strength function 104 S1 = 0�45�0�2. The s-wave radiative width and the s-wave neutron strength function appear to be lower for 137Ba than for the other barium isotopes.

The s-wave and p-wave strength functions

1961 ◽  
Vol 28 (4) ◽  
pp. 578-582 ◽  
Author(s):  
T.K. Krueger ◽  
B. Margolis
Keyword(s):  
P Wave ◽  
S Wave ◽  
Strength Functions

The s-wave and p-wave strength functions

1961 ◽  
Vol 28 (1) ◽  
pp. 578-582 ◽  
Author(s):  
T.K. Krueger ◽  
B. Margolis
Keyword(s):  
P Wave ◽  
S Wave ◽  
Strength Functions

scholarly journals High Resolution Neutron Transmission and Capture for 91Zr

1977 ◽  
Vol 30 (4) ◽  
pp. 391 ◽  
Author(s):  
AR de L Musgrove ◽  
JW Boldeman ◽  
BJ Allen ◽  
JA Harvey ◽  
RL Macklin
Keyword(s):  
Strength Function ◽  
P Wave ◽  
Level Spacing ◽  
S Wave ◽  
P Waves ◽  
Resonance Parameters ◽  
Neutron Transmission ◽  
Wave Resonance ◽  
Bombarding Energy ◽  
Average Level Spacing

The neutron transmission through 91 Zr was measured at both the 80 and 200 m stations of ORELA and, in combination with a capture measurement at .the 40 m. station, has resulted in resolved resonance parameters below. 20 keV bombarding , energy. The average s-wave resonance parameters obtained were as follows: the average level spacing <D). = 640� 120 eV,. the neutron strength function 104S~ = O�36�0�10 and the average radiative width <r,). = 140�8 meV. For p waveS, the average parameters were: <D)p = 300� 50 eV, 104 SI =5' 7 � 1'0 and <r,)p = 220� 12 meV. A correlation between p-wave reduced neutron widths and radiative widths is found which is attributed to valence neutron transitions.

scholarly journals Resonance Neutron Capture in 86,87Sr

1982 ◽  
Vol 35 (3) ◽  
pp. 267 ◽  
Author(s):  
GC Hicks ◽  
BJ Allen ◽  
AR de L Musgrove ◽  
RL Macklin
Keyword(s):  
Cross Sections ◽  
Neutron Capture ◽  
High Energy ◽  
P Wave ◽  
High Energy Resolution ◽  
Electron Linear Accelerator ◽  
Resonance Neutron ◽  
Oak Ridge ◽  
Average Resonance ◽  
Capture Cross Sections

The neutron capture cross sections of 86.87Sr have been measured with high energy resolution from 3 to 200 keY at the 40 m station of the Oak Ridge Electron Linear Accelerator. Individual resonances were analysed to 37 keY for 86Sr and to 14 keY for 87Sr, and average resonance parameters were deduced on the basis of assumed divisions between s- and p-wave resonances. The average radiative widths obtained on this basis are consistent with a capture mechanism which is predominantly statistical

scholarly journals Resonance Neutron Capture in 138Ba and 140Ce and the Prompt Neutron Correction to ?-ray Detectors

1979 ◽  
Vol 32 (3) ◽  
pp. 213 ◽  
Author(s):  
AR de L Musgrove ◽  
BJ Alien ◽  
RL Macklin
Keyword(s):  
Cross Sections ◽  
Neutron Capture ◽  
High Energy ◽  
P Wave ◽  
Prompt Neutron ◽  
High Energy Resolution ◽  
Capture Cross ◽  
S Wave ◽  
Strength Functions ◽  
Capture Cross Sections

The neutron capture cross sections of 138Ba and 140Ce have been measured with high energy resolution between 3 and 100 keY using the capture cross section facility at the 40 m station of the Oak Ridge Electron Linear Accelerator. The average s-wave level spacings are <D)s = 6�3 � 1 �7 and 3�2 � 0�8 keY for 138Ba and 140Ce respectively. The deduced s-wave neutron strength functions are 104So = 1�0�0�4 and 1�54�0�53 respectively, and the average s-wave radiative widths are <r,)s = 55�20 and 35�9meY. The p-wave neutron strength functions are 104S1 ~ 0�03 and 0�32�0�12 respectively. The average 30 keY Maxwellian capture cross sections are 3�9�0�8mb for 138Ba and 7�7 � 0�9 mb for 140Ce. A more rigorous treatment of the prompt neutron correction for l'-ray detectors is described, and it is shown that previously published results for 138Ba have underestimated this correction. The 140Ce data provide excellent corroboration for the calculated magnitude and time dependence of the prompt neutron correction.

scholarly journals Resonant Neutron Capture in 139La

1977 ◽  
Vol 30 (6) ◽  
pp. 599 ◽  
Author(s):  
AR de L Musgrove ◽  
BJ Allen ◽  
RL Macklin
Keyword(s):  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Strength Function ◽  
High Energy ◽  
P Wave ◽  
High Energy Resolution ◽  
Capture Cross ◽  
Electron Linear Accelerator ◽  
Oak Ridge

The neutron capture cross section of 139La has been measured with high energy resolution between 2� 5 and 90 ke V using the capture cross section facility at the 40 m station on the Oak Ridge Electron Linear Accelerator. Individual resonances were analysed to 15 keV and the average s- and p-wave radiative widths deduced were <Γγ>s = 55�6meV and <Γγ>p = 4O�7meV. The p-wave neutron strength function obtained was S1 = (0'30�0'1O)x 10-4 ? The s-wave resonances decay strongly to final f-wave states via a postulated doorway state mechanism. The transition strengths for these decays are not correlated with the neutron widths of the initial states.

scholarly journals Post-collisional mantle delamination in the Dinarides implied from staircases of Oligo-Miocene uplifted marine terraces

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Philipp Balling ◽  
Christoph Grützner ◽  
Bruno Tomljenović ◽  
Wim Spakman ◽  
Kamil Ustaszewski
Keyword(s):  
Balkan Peninsula ◽  
Receiver Functions ◽  
P Wave ◽  
S Wave ◽  
Slab Geometry ◽  
Surface Uplift ◽  
River Incision ◽  
Marine Terraces ◽  
Convergence System ◽  
Internal Dinarides

AbstractThe Dinarides fold-thrust belt on the Balkan Peninsula resulted from convergence between the Adriatic and Eurasian plates since Mid-Jurassic times. Under the Dinarides, S-wave receiver functions, P-wave tomographic models, and shear-wave splitting data show anomalously thin lithosphere overlying a short down-flexed slab geometry. This geometry suggests a delamination of Adriatic lithosphere. Here, we link the evolution of this continental convergence system to hitherto unreported sets of extensively uplifted Oligocene–Miocene (28–17 Ma) marine terraces preserved at elevations of up to 600 m along the Dinaric coastal range. River incision on either side of the Mediterranean-Black Sea drainage divide is comparable to the amounts of terrace uplift. The preservation of the uplifted terraces implies that the most External Dinarides did not experience substantial deformation other than surface uplift in the Neogene. These observations and the contemporaneous emplacement of igneous rocks (33–22 Ma) in the internal Dinarides suggest that the Oligo-Miocene orogen-wide uplift was driven by post-break-off delamination of the Adriatic lithospheric mantle, this was followed by isostatic readjustment of the remaining crust. Our study details how lithospheric delamination exerts an important control on crustal deformation and that its crustal signature and geomorphic imprint can be preserved for millions of years.

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