Doorway states in s-, p-, and d-wave entrance channels in /sup 207/Pb + n reaction

Journal Article · Tue Aug 01 00:00:00 EDT 1978 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.18.722· OSTI ID:6668854

Horen, D J; Harvey, J A; Hill, N W

The /sup 207/Pb + n reaction has been studied by means of high resolution neutron transmission and differential elastic scattering measurements. Information pertaining to resonance parameters (E/sub n/,l,J, and GAMMA/sub n/) for some 118 resonances in the energy interval from 3 to 485 keV has been obtained. Distributions of neutron strengths have been determined for each value of J that can be formed by s-, p-, and d-wave neutrons interacting with the /sup 207/Pb ground state (J/sup ..pi../ = 1/2/sup -/). The existence of a doorway state in the J/sup ..pi../ = 1/sup -/, s-wave channel at approx. 500 keV is confirmed. Evidence is also found for the presence of doorway states in the p-wave (J/sup ..pi../ = 1/sup +/) and d-wave (J/sup ..pi../ = 1/sup -/) channels. The doorway states in the p-wave channel are shown to be correlated with M1 ground-state radiative strength in /sup 208/Pb. In the energy region above the doorway state, the ''average'' p-wave strength function for forming 1/sup +/ resonances (S/sup 1/(1/sup +/) = (6.8 +- 0.6) x 10/sup -5/) is found to be equal to the sum of those for forming 0/sup +/ (S/sup 1/(0/sup +/) = (4.2 +- 1.0) x 10/sup -5/) and 2/sup +/ (2/sup 1/(2/sup +/) = (2.8 +- 0.4) x 10/sup -5/) resonances in agreement with predictions of the random phase assumption.

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• OSTI ID: 6668854
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 18:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYON REACTIONS
CAPTURE
CROSS SECTIONS
D WAVES
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
HADRON REACTIONS
HEAVY NUCLEI
ISOTOPES
KEV RANGE
LEAD 207 TARGET
LEAD 208
LEAD ISOTOPES
NEUTRON REACTIONS
NEUTRON SPECTRA
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
P WAVES
PARITY
PARTIAL WAVES
PARTICLE PROPERTIES
RESONANCE
S WAVES
SCATTERING
SPECTRA
SPIN
STABLE ISOTOPES
TARGETS