Non-statistical effects in neutron capture at 98Mo p-wave resonances

1970 ◽  
Vol 150 (1) ◽  
pp. 97-104 ◽  
Author(s):  
G. Rohr ◽  
H. Weigmann ◽  
J. Winter
Keyword(s):  
Neutron Capture ◽  
P Wave ◽  
Statistical Effects

scholarly journals Gamma Ray Transitions following keV Neutron Capture in 2s-1d Shell Nuclei

1974 ◽  
Vol 27 (6) ◽  
pp. 759 ◽  
Author(s):  
MJ Kenny ◽  
PW Martin ◽  
LE Carlson ◽  
JA Biggerstaff
Keyword(s):  
Neutron Capture ◽  
Gamma Ray ◽  
Negative Parity ◽  
Mass Region ◽  
P Wave ◽  
S Wave

A Ge(Li) detector has been used to observe y-ray transitions after the capture of keV neutrons in natural samples of F, AI, Si, Sand Ar. Transitions to positive and negative parity states show that there are strong p-wave resonances as well as s-wave resonances in this mass region. The even-Z nuclei decay more by El transitions than by Ml. Odd-Z nuclei decay by strong Ml transitions.

Resonance neutron capture in silicon

1976 ◽  
Vol 54 (4) ◽  
pp. 383-389 ◽  
Author(s):  
V. J. Thomson ◽  
W. V. Prestwich ◽  
T. J. Kennett
Keyword(s):  
Gamma Rays ◽  
Neutron Capture ◽  
P Wave ◽  
Resonance Neutron ◽  
Decay Properties ◽  
Resonance Decay

Measurement of gamma rays following neutron capture has revealed resonances at 29, 67, 85, and 173 keV for the 28Si(n,γ)29Si reaction, and 16 and 35 keV for the 29Si(n,γ)30Si reaction. The characteristics of the resonance decay properties are discussed. Both the 67 and 85 keV resonances appear to result from p wave capture.

Non-statistical effects in neutron capture γ-ray spectra

1977 ◽  
Vol 278 (2) ◽  
pp. 204-216 ◽  
Author(s):  
R.F. Barrett ◽  
K.H. Bray ◽  
B.J. Allen ◽  
M.J. Kenny
Keyword(s):  
Neutron Capture ◽  
Γ Ray ◽  
Statistical Effects

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.

scholarly journals Non-Statistical Effects in Neutron Capture

2009 ◽  
Author(s):  
P. E. Koehler ◽  
T. A. Bredeweg ◽  
K. H. Guber ◽  
J. A. Harvey ◽  
J. M. O’Donnell ◽  
...  
Keyword(s):  
Neutron Capture ◽  
Statistical Effects

scholarly journals Measurement of the angular distribution of γ-rays after neutron capture by 139La for a T-violation search

2019 ◽  
Vol 219 ◽  
pp. 09001 ◽  
Author(s):  
Takuya Okudaira ◽  
Hirohiko M. Shimizu ◽  
Masaaki Kitaguchi ◽  
Katsuya Hirota ◽  
Christopher C. Haddock ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Neutron Capture ◽  
Germanium Detector ◽  
P Wave ◽  
S Wave ◽  
Proton Proton ◽  
Wave Resonance ◽  
T Violation ◽  
Γ Rays ◽  
Neutron Width

Parity violating effects enhanced by up to 106 times compared to proton-proton scattering have been observed in several neutron capture induced compound nuclei. This enhancement is explained as an interference between an s-wave and a p-wave amplitude (s-p mixing). Theory predicts that this mechanism can also enhance T-violating effects. For estimation of this enhancement in a promising candidate nucleus, we measured the angular distribution of γ-rays in the (n,γ) reaction induced in a 139La target. Experiments were performed at J-PARC, using a germanium detector array at an intense neutron beam. Analysis of the observed angular dependence around the 0.74 eV p-wave resonance allowed us to determine the ratio of the partial p-wave neutron width to the total neutron width in the entrance channel of the compound nucleus. We also report our development of a 3He spin filter needed as an epithermal-neutron polarizer for the T-violation search.

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