Abstract
An initial series of experiments utilising the (3 He,n) reactions have been carried out at iThemba LABS. These are complimentary to transfer reactions such as (t,p) stripping or (p,t) pick-up reactions measurements using magnetic spectrometers. However, in the past, (3 He,n) measurements have suffered from ambiguities due to the low energy resolution inbuilt into the time-of-flight techniques used. By combining neutron detection techniques with the AFRODITE γ -ray array, it has been shown that very good energy resolutions can be achieved. This enables the relative strengths of two proton stripping to excited states, separated by only a few keV, to be accurately measured. This technique has been applied to first excited 02 + states and, in particular to those uniquely seen in double β -decay.
Highlights
The study of excited 0+ states provides information on how nucleons are paired and their associated structures in the nucleus [1]
Accurate two proton transfer data would give valuable information on the role of proton pairing in the microscopic structure of 0+ states
There is the ambition of using the double -ray decay from the 02+ states to give a fourfold coincidence with the two electrons to improve the sensitivity of experiments so that the level of 1024 y partial half-life can be achieved
Summary
The study of excited 0+ states provides information on how nucleons are paired and their associated structures in the nucleus [1]. Accurate two proton transfer data would give valuable information on the role of proton pairing in the microscopic structure of 0+ states. In this contribution the apparatus used is presented and the application to the first excited 02+ states in 100Ru and 150Sm seen in double -decay [6,7]. There is the ambition of using the double -ray decay from the 02+ states to give a fourfold coincidence with the two electrons to improve the sensitivity of experiments so that the level of 1024 y partial half-life can be achieved This is the estimated sensitivity required to detect 2 0 neutrinoless double decay to determine the Majorana/Dirac nature of neutrinos.
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