Gamow-Teller transitions studied in the high-resolution {sup 64}Ni({sup 3}He,t){sup 64}Cu reaction

Journal Article · Mon Jun 15 00:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.064312· OSTI ID:21293745

Popescu, L; Frenne, D De; Jacobs, E; Negret, A ^[1]; Adachi, T; Fujita, Y; Tameshige, Y ^[2]; Berg, G P. A.; Harakeh, M N; Woertche, H J ^[3]; Brentano, P von ^[4]; Frekers, D; Grewe, E -W ^[5]; Fujita, K; Hatanaka, K; Nakanishi, K; Sakemi, Y; Shimbara, Y; Shimizu, Y; Tamii, A ^[6]

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1. Vakgroep Subatomaire en Stralingsfysica, Universiteit Gent, B-9000 Gent (Belgium)
2. Department of Physics, Osaka University, Toyonaka, Osaka 560-0043 (Japan)
3. KVI, University of Groningen, NL-9747 AA Groningen (Netherlands)
4. IKP Koeln University, Koeln (Germany)
5. Institut fuer Kernphysik, Westfaelische Wilhelms-Universitaet Muenster, D-48149 Muenster (Germany)
6. RCNP, Osaka University, Ibaraki, Osaka 567-0047 (Japan)

To study the Gamow-Teller (GT) transitions to the pf-shell nucleus {sup 64}Cu, the {sup 64}Ni({sup 3}He,t){sup 64}Cu experiment was performed at the Research Center for Nuclear Physics (RCNP) Ring Cyclotron, Osaka, using a {sup 3}He beam of 140 MeV/nucleon. The outgoing tritons were momentum analyzed by the Grand Raiden spectrometer at 0 deg. A high energy resolution of 32 keV (full width at half-maximum) allowed the separation of individual levels in the excitation-energy region from 0 to 3.5 MeV. In addition to the ground state (gs), known to be a J{sup {pi}}=1{sup +} GT state, many low-lying states showed L=0 nature, suggesting that they are candidates for GT states. Because the GT strength B(GT) for the gs transition is known from the {beta}-decay measurement, the strengths for the excited states could be determined using the proportionality between the B(GT) and the reaction cross section extrapolated to q=0 momentum transfer. At higher excitation energies, the level density becomes high and the so-called GT giant resonance dominates the spectrum. The lower and the upper limits of the strength contained in this energy region were estimated. Our results show that less than 55% of the strength predicted by the Ikeda sum rule is located in the excitation-energy region from 0 to 17 MeV.

• OSTI ID: 21293745
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 79, Issue 6; Other Information: DOI: 10.1103/PhysRevC.79.064312; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BEAMS
BETA DECAY
COPPER 64
CROSS SECTIONS
ENERGY RESOLUTION
ENERGY-LEVEL DENSITY
EXCITATION
EXCITED STATES
GAMOW-TELLER RULES
GIANT RESONANCE
GROUND STATES
HELIUM 3
MEV RANGE
MOMENTUM TRANSFER
NICKEL 64 TARGET
NUCLEAR REACTIONS
NUCLEONS
SPECTRA
SUM RULES
TRITONS