Charge-exchange reactions and nuclear matrix elements for {beta}{beta} decay

Journal Article · Mon Nov 09 00:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3266101· OSTI ID:21322972

Frekers, D ^[1]

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1. Institut fuer Kernphysik, Westfaelische Wilhelms-Universitaet, D-48149 Muenster (Germany)

Charge-exchange reactions of (n, p) and (p, n) type at intermediate energies are a powerful tool for the study of nuclear matrix element in {beta}{beta} decay. The present paper reviews some of the most recent experiments in this context. Here, the (n, p) type reactions are realized through (d, {sup 2}He), where {sup 2}He refers to two protons in a singlet {sup 1}S{sub 0} state and where both of these are momentum analyzed and detected by the same spectrometer and detector. These reactions have been developed and performed exclusively at KVI, Groningen (NL), using an incident deuteron energy of 183 MeV. Final state resolutions of about 100 keV have routinely been available. On the other hand, the ({sup 3}He, t) reaction is of (p, n) type and was developed at the RCNP facility in Osaka (JP). Measurements with an unprecedented high resolution of 30 keV at incident energies of 420 MeV are now readily possible. Using both reaction types one can extract the Gamow-Teller transition strengths B(GT{sup +}) and B(GT{sup -}), which define the two ''legs'' of the {beta}{beta} decay matrix elements for the 2v{beta}{beta} decay The high resolution available in both reactions allows a detailed insight into the excitations of the intermediate odd-odd nuclei and, as will be shown, some unexpected features are being unveiled.

• OSTI ID: 21322972
• Journal Information: AIP Conference Proceedings, Vol. 1180, Issue 1; Conference: Workshop on circulation of double-beta-decay matrix, Prague (Czech Republic), 15-19 Jun 2009; Other Information: DOI: 10.1063/1.3266101; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGE-EXCHANGE REACTIONS
DEUTERONS
DOUBLE BETA DECAY
EXCITATION
GAMOW-TELLER RULES
HELIUM 2
HELIUM 3
KEV RANGE
KVI
MATRIX ELEMENTS
MEV RANGE
NEUTRON REACTIONS
NUCLEAR MATRIX
NUCLEAR STRUCTURE
ODD-ODD NUCLEI
PROTON REACTIONS
PROTONS
RESOLUTION
STRENGTH FUNCTIONS