CERN research proposal
QEC value determination of the superallowed beta-decay of 70Br
CERN INTC
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- Date
- 2017-05-13
- Identifier
- INTC-P-514
What it covers
CERN INTC proposal INTC-P-514: measure the Q_EC value of the superallowed β decay of ⁷⁰Br, a needed input for a precision ft-value.
Methods and setup
ISOLTRAP mass difference between ⁷⁰Br and ⁷⁰Se, with the purification needed for a short-lived, contaminated bromine beam.
Why it matters
Superallowed 0⁺→0⁺ decays are the cleanest weak-interaction laboratory in nuclei. A wrong ⁷⁰Br Q-value is a wrong V_ud contribution from that pair.
Research topics
Nuclear physicsCERNISOLDEWeak interaction