Referee Report by H. H. Gutbrod for

Probing the Deuteron short-range Spin Structure in the (d,p) reactions using polarized deuteron beam at Nuclotron

DSS – project

The main goal of the project is to study the deuteron and three-nucleon systems short-

range spin structure via the measurements of the polarization observables in the dp-, pd-

and dd- reactions at Nuclotron.

I agree with the referee colleagues that this program is scientifically of importance and that the team has shown competence in carrying out the experimental challenges.

However, the rather low intensity of the polarized deuteron beam, and the use of thin CH2 target presents a challenge to obtain the requested error bars in the data. Since the data are coincidence/correlation measurements, a good coverage of the phase space by the detector set-up is important. Here I see a large improvement potential and need, especially when

the investment into the detector is compared with the full running costs per hour of the Nuclotron. I request from the collaboration that the team finds funding for a substantial increase in coverage of phase space. This will enter quadratically into the detection efficiency.

My recommendation is to approve that project with first priority under the conditions that the collaboration improves substantially the detection efficiency of their set-up.

Heidelberg, June 12, 2018