β-decay angular correlations with neutral atom traps

Previous speakers have already emphasized the importance of electron-neutrino angular correlations in identifying the basic interactions in β-decay. We have also seen that there are some serious inconsistencies in the experimental situation. At the same time I should like to say that I can see no strong reason to reject any of these results. In this talk I propose to describe some of the difficulties one encounters in this kind of work and to illustrate these with a description of the experiment on 23 Ne. There are three observables one can use to find the electron-neutrino correlation: the electron energy E , the recoil momentum r , and the angle θ between the electron and recoil rays. Measurements of the distribution in θ or r alone will suffice, but it is better to measure these in pairs, for reasons I shall give presently. Possible combinations are:

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Aspects of neutral atom traps for antihydrogen spectroscopy

EXA/LEAP 2008 ◽

10.1007/978-3-642-02803-8_63 ◽

2009 ◽

pp. 433-439

Author(s):

Cláudio L. Cesar ◽

Paolo Crivelli ◽

Ricardo Lambo

Keyword(s):

Neutral Atom ◽

Atom Traps

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New low-spin states of 122Xe observed via high-statistics β-decay of 122Cs

EPJ Web of Conferences ◽

10.1051/epjconf/201817802026 ◽

2018 ◽

Vol 178 ◽

pp. 02026

Author(s):

B. Jigmeddorj ◽

P. E. Garrett ◽

C. Andreoiu ◽

G. C. Ball ◽

T. Bruhn ◽

...

Keyword(s):

Angular Correlation ◽

Excited States ◽

Spin States ◽

Β Decay ◽

Angular Correlations ◽

Correlation Analyses ◽

Hpge Detectors

Excited states of 122Xe were studied via the β+/EC decay of 122Cs with the 8π γ-ray spectrometer at the TRIUMF-ISAC facility. Compton-suppressed HPGe detectors were used for measurements of γ-ray intensities, γγ coincidences, and γ-γ angular correlations. Two sets of data were collected to optimize the decays of the ground (21.2 s) and isomeric (3.7 min) states of 122Cs. The data collected have enabled the observation of about 505 new transitions and about 250 new levels, including 51 new low-spin states. Spin assignments have been made for 58 low-spin states based on the deduced β-decay feeding and γ-γ angular correlation analyses.

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