Gamow-Teller Strength Distributions in {sup 48}Sc by the {sup 48}Ca(p,n) and {sup 48}Ti(n,p) Reactions and Two-Neutrino Double-beta Decay Nuclear Matrix Elements

Journal Article · Fri Jul 03 00:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.103.012503· OSTI ID:21347020

Yako, K; Sasano, M; Miki, K; Sakai, H; Noji, S ^[1]; Dozono, M; Ihara, E; Wakasa, T ^[2]; Frekers, D ^[3]; Greenfield, M B ^[4]; Hatanaka, K; Kato, M; Matsubara, H; Okamura, H; Sakemi, Y; Tamii, A ^[5]; Kawabata, T; Sakaguchi, S; Sasamoto, Y; Shimizu, Y ^[6]

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1. Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033 (Japan)
2. Department of Physics, Kyushu University, Higashi, Fukuoka 812-8581 (Japan)
3. Institute fuer Kernphysik, Westfaelische Wilhelms-Universitaet, D-48149 Muenster (Germany)
4. International Christian University, Mitaka, Tokyo 181-8585 (Japan)
5. Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047 (Japan)
6. Center for Nuclear Study, University of Tokyo, Bunkyo, Tokyo 113-0033 (Japan)

The double-differential cross sections for the {sup 48}Ca(p,n) and {sup 48}Ti(n,p) reactions were measured at 300 MeV. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) components. The integrated GT strengths up to an excitation energy of 30 MeV in {sup 48}Sc are 15.3+-2.2 and 2.8+-0.3 in the (p,n) and (n,p) spectra, respectively. In the (n,p) spectra additional GT strengths were found above 8 MeV where shell models within the fp shell-model space predict almost no GT strengths, suggesting that the present shell-model description of the nuclear matrix element of the two-neutrino double-beta decay is incomplete.

• OSTI ID: 21347020
• Journal Information: Physical Review Letters, Vol. 103, Issue 1; Other Information: DOI: 10.1103/PhysRevLett.103.012503; (c) 2009 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CALCIUM 48 TARGET
DIFFERENTIAL CROSS SECTIONS
DOUBLE BETA DECAY
EXCITATION
GAMOW-TELLER RULES
MEV RANGE
NEUTRINOS
NEUTRON REACTIONS
NEUTRONS
NUCLEAR MATRIX
PROTON REACTIONS
PROTONS
SCANDIUM 48
SHELL MODELS
SPECTRA
TITANIUM 48 TARGET
BARYON REACTIONS
BARYONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
FERMIONS
HADRON REACTIONS
HADRONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MATRICES
NUCLEAR DECAY
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
ODD-ODD NUCLEI
RADIOISOTOPES
SCANDIUM ISOTOPES
TARGETS