Radiative capture of s electrons in the decay of $sup 51$Cr
The high-energy portion of the spectrum of internal-bremsstrahlung photons accompanying the allowed electron-capture transition from /sup 51/Cr to the ground state of /sup 51/V has been measured with a Ge(Li) gamma -ray spectrometer supplied with a pileup rejector. The most important correction for the residual pileup spectrum caused by the 320.1 kev nuclear gamma rays from the deexcitation of the first excited state in /sup 51/V was performed by extrapolation from a set of measurements with sources of different activities. The pulse-height spectrum of intenal-bremsstrahlung photons was corrected for detector response. For energies higher than 348.1 keV the number of bremsstrahlung photons emitted per ground-state electron-capture (EC) decay of / sup 51/Cr was determined to be (9.56 plus or minus 0.60) x l0/sup -5/. Corresponding theoretical values are 9.49 x l0/sup -5/ predicted by the theory of Martin and Galuber, and 9.47 x l0/sup -5/ deduced from recent calculations of Intemann. The present result confirms the predictions of theory for railiative capture of ls + 2s orbital electrons, in contradiction to recent results on /sup 51/Cr and other EC decaying light nuclides, obtained mainly by bremsstrahlung- gamma -coincidence measurements. The transition energy of /sup 51/Cr was determined to be 760 plus or minus 15 keV, in good agreement with accepted atomic mass differences. (auth)
- Research Organization:
- Central Bureau for Nuclear Measurements, EURATOM, 2440 Geel, Belgium
- NSA Number:
- NSA-29-014208
- OSTI ID:
- 4355212
- Journal Information:
- Phys. Rev., C, v. 8, no. 4, pp. 1370-1378, Other Information: Orig. Receipt Date: 30-JUN-74
- Country of Publication:
- United States
- Language:
- English
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