Investigation of isobaric spin splitting in the giant resonance of zinc 64
- Iowa State Univ., Ames, IA (United States)
Relative cross sections for the reactions Zn 64 (γ, n)Zn 63, Zn 64 (γ,np) Cu 62, and Zn 64(γ, 2n)Zn62 have been simultaneously measured using 10-40 mev bremsstrahulung. The positron activities were detected by coincident gamma rays and the three activities were separated by halflife. The (γ,np) cross section is seen to be split into a strong and distinct resonance at 25 mev and a broad component which rises on the trailing edge of the dominant resonance. The 25 mev (γ,np) peak is very similar in shape to the (y,n) resonance centered at 17.5 mev and is about 20% of the (γ,n) amplitude. The (y, 2n) cross section is also at maximum near 25 mev but is less than 1/3 of the (γ,np) amplitude, thus, the large (γ,np) strength is apparently not statistical in origin. The (γ,np) resonance is identified with the T> isospin component of the giant resonance. This identification is consistent with estimates of the relative T component strengths and energy splitting obtained with recently published isospin sum rules and the enhancement of the (γ,np) reaction channel can be understood from the proton instability of known T=5/2 analog levels in the neutron-residual Zn63 nucleus.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- US Atomic Energy Commission (AEC)
- DOE Contract Number:
- W-7405-ENG-82
- NSA Number:
- NSA-24-038138
- OSTI ID:
- 4148693
- Report Number(s):
- IS-T--351
- Country of Publication:
- United States
- Language:
- English
Similar Records
Photoproton cross section and isospin components of the giant resonance in $sup 64$Zn
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Journal Article
·
Sun Dec 31 23:00:00 EST 1972
· Nucl. Phys., A, v. A213, no. 2, pp. 358-370
·
OSTI ID:4431099
Isospin splitting of giant dipole resonance and the cross section of the reaction /sup 64/Zn(. gamma. ,n)/sup 63/Zn
Journal Article
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Sat Mar 04 23:00:00 EST 1978
· JETP Lett. (USSR) (Engl. Transl.); (United States)
·
OSTI ID:6684993
(n,2n) REACTION CROSS SECTIONS FROM 12 TO 19.6 Mev
Journal Article
·
Sun Apr 14 23:00:00 EST 1963
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
·
OSTI ID:4727559
Related Subjects
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BREMSSTRAHLUNG
BREMSSTRAHLUNG/reactions (gamma,n), (gamma,2n), and (gamma,np) with zinc-64 at 10 to 40 MeV, cross sections for, (E)
COPPER 62
CROSS SECTIONS
GIANT RESONANCE
ISOSPIN
MEV RANGE 10-100
NEUTRONS
NUCLEAR REACTIONS
PHOTON BEAMS
PROTONS
RESONANCE
ZINC 62
ZINC 63
ZINC 64
ZINC ISOTOPES Zn-64/photon reactions (gamma,n), (gamma,2n), and (gamma,np) at 10 to 40 MeV, cross sections for, (E)
BREMSSTRAHLUNG
BREMSSTRAHLUNG/reactions (gamma,n), (gamma,2n), and (gamma,np) with zinc-64 at 10 to 40 MeV, cross sections for, (E)
COPPER 62
CROSS SECTIONS
GIANT RESONANCE
ISOSPIN
MEV RANGE 10-100
NEUTRONS
NUCLEAR REACTIONS
PHOTON BEAMS
PROTONS
RESONANCE
ZINC 62
ZINC 63
ZINC 64
ZINC ISOTOPES Zn-64/photon reactions (gamma,n), (gamma,2n), and (gamma,np) at 10 to 40 MeV, cross sections for, (E)