Comparison of giant dipole resonance decay in stiff sup 92 Mo and soft sup 100 Mo excited nuclei

Journal Article · Sat Feb 01 00:00:00 EST 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.45.569· OSTI ID:7205982

Kicinska-Habior, M ^[1]; Snover, K A; Behr, J A; Gossett, C A; Gundlach, J H; Feldman, G ^[2]

---

1. Institute of Experimental Physics, University of Warsaw, 00-681 Warsaw (Poland) Nuclear Physics Laboratory, University of Washington, Seattle, Washington 98195 (United States)
2. Nuclear Physics Laboratory, University of Washington, Seattle, Washington 98195 (United States)

Gamma-ray spectra from the decay of the giant dipole resonance (GDR) built on excited states of {sup 92}Mo and {sup 100}Mo nuclei at average spins (9--24){h bar} and temperatures of 1.35--1.50 MeV were measured, and the parameters of a two-component GDR strength function were extracted. Deformations determined from the fitted component energies are substantially larger than predicted by the rotating liquid drop model, suggesting large thermal shape fluctuations. Widths of the GDR in {sup 92}Mo increase from 7.6{plus minus}0.1 to 8.6{plus minus}0.2 MeV in the spin range of (9--19.5){h bar} and temperature range of 1.35--1.45 MeV, as compared with the ground-state GDR width of 5.4{plus minus}0.2 MeV. In {sup 100}Mo the GDR width is nearly constant and equals 9.8{plus minus}0.2, 9.9{plus minus}0.2, and 10.1{plus minus}0.2 MeV at average spins 9{h bar}, 19.5{h bar}, and 24{h bar} and temperatures 1.35, 1.45, and 1.50 MeV, respectively, as compared with the ground-state width of 7.9{plus minus}0.2 MeV. The observed difference in the GDR widths between the two molybdenum isotopes at the same temperatures and spins indicates that shell effects are still present at the temperatures studied.

• OSTI ID: 7205982
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 45:2; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
MOLYBDENUM 100
GAMMA SPECTRA
MOLYBDENUM 92
OXYGEN 16 REACTIONS
COMPOUND-NUCLEUS REACTIONS
OXYGEN 18 REACTIONS
SELENIUM 76 TARGET
SELENIUM 82 TARGET
E1-TRANSITIONS
EXCITED STATES
EXPERIMENTAL DATA
GAMMA DECAY
MEV RANGE 10-100
CHARGED-PARTICLE REACTIONS
DATA
DECAY
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
HEAVY ION REACTIONS
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MEV RANGE
MOLYBDENUM ISOTOPES
MULTIPOLE TRANSITIONS
NANOSEC LIVING RADIOISOTOPES
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
RADIOISOTOPES
SPECTRA
STABLE ISOTOPES
TARGETS
663110* - General & Average Properties of Nuclei & Nuclear Energy Levels- (1992-)
663220 - Electromagnetic Transitions- (1992-)
663450 - Heavy-Ion-Induced Reactions & Scattering- (1992-)