scholarly journals De-excitation Gamma Rays Following Photodisintegration of 28Si

1972 ◽  
Vol 25 (6) ◽  
pp. 669 ◽  
Author(s):  
JEM Thomson ◽  
ND Champion ◽  
RJJ Stewart ◽  
MN Thompson
Keyword(s):  
Excited States ◽  
Gamma Rays ◽  
Cross Sections ◽  
Single Particle ◽  
Photonuclear Reaction ◽  
Giant Resonance ◽  
Resonance Region ◽  
Particle Nature

Integrated cross sections for the population of excited states of 27AI and 27Si following photodisintegration of 28Si are presented. Consistency with particle pickup reactions is claimed as evidence of the single-particle nature of the photonuclear reaction in the giant resonance region.

Proton Capture Gamma Rays in the Giant Resonance Region

1959 ◽  
Vol 3 (4) ◽  
pp. 177-179 ◽  
Author(s):  
H. E. Gove ◽  
A. E. Litherland ◽  
R. Batchelor
Keyword(s):  
Gamma Rays ◽  
Giant Resonance ◽  
Resonance Region ◽  
Proton Capture

Photoneutron Cross Sections in 14N

1972 ◽  
Vol 50 (15) ◽  
pp. 1689-1696 ◽  
Author(s):  
R. W. Gellie ◽  
K. H. Lokan ◽  
N. K. Sherman ◽  
R. G. Johnson ◽  
J. I. Lodge
Keyword(s):  
Excited States ◽  
Cross Section ◽  
Cross Sections ◽  
Neutron Emission ◽  
Giant Resonance ◽  
Sequential Decay ◽  
Dipole Resonance ◽  
Intermediate States ◽  
Integrated Cross Section ◽  
High Degree

Photoneutron distributions from 14N have been obtained by time-of-flight methods, for bremsstrahlung end-point energies increasing in 2 MeV steps from 15.5 to 29.5 MeV. A large part of the neutron yield is associated with the sequential decay of 14N to 12C, through well-defined intermediate states of 13C, at 7.55, 8.86, and 11.80 MeV, which are unstable against neutron emission. The (γ,n0) cross section for neutron emission to the ground state of 13N is found to agree very closely with the corresponding (γ,p0) cross section, implying a high degree of isospin purity for the giant dipole resonance of 14N. It is observed that the decay of the giant resonance proceeds freely through those odd-parity excited states of the A = 13 nuclei which are single hole states formed by the removal of a p-shell nucleon from the parent 14N.The integrated cross section for all neutron-producing interactions is found to be 88 ± 5 MeV mb.

THE DECAY OF Os191 AND Os193

1958 ◽  
Vol 36 (10) ◽  
pp. 1409-1429 ◽  
Author(s):  
S. V. Nablo ◽  
M. W. Johns ◽  
R. H. Goodman ◽  
A. Artna
Keyword(s):  
Excited States ◽  
Gamma Rays ◽  
Cross Sections ◽  
Decay Scheme ◽  
Internal Conversion ◽  
Gamma Ray ◽  
Internal Conversion Coefficients ◽  
Gamma Coincidence ◽  
Conversion Coefficients ◽  
Activation Cross Sections

The beta- and gamma-ray spectra of Os191 and Os193 have been studied with a magnetic beta-ray spectrometer, scintillation spectrometers, and coincidence circuits. The 14-hour isomer of Os191 decays via a 0.0742-Mev (M3) transition. Gamma rays of energy 0.0418 (100%, E3), 0.0809 (1%, M1 + E2), 0.1287 (100%, M1 + E2), and 0.1858 (0.1%) Mev have been found to be associated with the 14.6 ± 0.3 day decay of Os191 and an extension of the accepted decay scheme proposed. The following 19 transitions have been associated with the 31.5 ± 0.5 hour decay of Os193: 0.0730 (14%), 0.1068 (~1%), 0.1393 (10%), 0.180 (0.3%), 0.196 (0.1%), 0.243 (~0.2%), 0.2485 (0.3%), 0.2514 (0.4%), 0.278 (0.6%), 0.2810 (1.6%), 0.2885 (0.3%), 0.2994 (0.4%), 0.314 (0.3%), 0.3218 (1.7%), 0.3620 (0.6%), 0.3878 (1.6%), 0.4604 (4.1%), 0.4857 (0.3%), and 0.5585 (2.2%). The internal conversion coefficients for all the stronger transitions suggest that they are M1 + E2 in character. The decay energy of Os193 is 1.132 ± 0.005 Mev. Fermi analyses and beta–gamma coincidence experiments have established excited states of Ir193 at 0.073, 0.139, 0.281, 0.362, 0.460, and 0.559 Mev above the ground state. Six otherwise unclassified weak gamma rays can be accommodated if levels at 0.247, 0.315, and 0.613 Mev are included in the decay scheme.The activation cross sections of Os184 and Os190 are (2.2 ± 0.5) × 103and 5.3 ± 2 barns respectively, relative to Seren's value of 1.6 ± 0.4 barns for Os192.

Yields and cross sections of the 241Am(γ, n)240mfAm and 243Am(γ, n)242mf-Am reactions in the E1 giant resonance region

1979 ◽  
Vol 324 (1) ◽  
pp. 29-38 ◽  
Author(s):  
V.L. Kuznetsov ◽  
L.E. Lazareva ◽  
V.G. Nedorezov ◽  
N.V. Nikitina ◽  
N.M. Parovic
Keyword(s):  
Cross Sections ◽  
Giant Resonance ◽  
Resonance Region

Proton capture gamma rays in the giant resonance region in light nuclei

1961 ◽  
Vol 26 (3) ◽  
pp. 480-510 ◽  
Author(s):  
H.E. Gove ◽  
A.E. Litherland ◽  
R. Batchelor
Keyword(s):  
Gamma Rays ◽  
Giant Resonance ◽  
Resonance Region ◽  
Light Nuclei ◽  
Proton Capture

EXCLUSIVE MEASUREMENTS OF OMEGA ELECTROPRODUCTION OFF THE PROTON IN THE RESONANCE REGION

2014 ◽  
Vol 26 ◽  
pp. 1460062
Author(s):  
◽  
EVAN PHELPS
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Resonance Region ◽  
High Mass ◽  
Strong Interactions ◽  
Current Analysis ◽  
Baryon Spectrum ◽  
Discriminating Power ◽  
Double Pion ◽  
Excited Baryon

A complete theory of strong interactions must describe the excited baryon spectrum as well as the structure of prominent states, which reflects the dynamics of nonperturbative QCD. Beyond the discriminating power of exclusive single- and double-pion electroproduction, the ω channel provides an additional probe of high-mass excited states. The current analysis provides preliminary differential and integrated cross sections of ω electroproduction off the proton from W = 1.7 to 3.2 GeV and Q2 = 1.5 to 5.5 GeV2. The data was collected by JLab's CLAS detector during two run periods and comprises the largest sample of exclusive resonance-region ω electroproduction ever analyzed. Preliminary Legendre decomposition of the cross sections supports previous indications of s-channel contributions to cross sections in the resonance region.

Cross Sections and Angular Distributions for the10B(e,p) and10B(e,d) Reactions in the Giant Resonance Region

2004 ◽  
Vol 73 (4) ◽  
pp. 875-881 ◽  
Author(s):  
Hiroaki Ueno ◽  
Hiroshi Taneichi ◽  
Yoshio Takahashi ◽  
Tomokazu Suzuki ◽  
Katsufusa Shoda ◽  
...  
Keyword(s):  
Cross Sections ◽  
Giant Resonance ◽  
Resonance Region ◽  
Angular Distributions
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