Study of the $\bm{p+^6}$Li$\bm{\to\eta+^7}$Be reaction 11.3 MeV above threshold

TL;DR

This study measured the cross section of the $p+^6$Li to $ ext{eta}+^7$Be reaction at 11.3 MeV above threshold, providing experimental data to compare with theoretical models.

Contribution

The paper presents the first measurement of the differential cross section for the $p+^6$Li to $ ext{eta}+^7$Be reaction at a specific excess energy, using a dedicated detection setup.

Findings

Measured differential cross section: 0.69 ± 0.20 nb/sr.

Detection of $^7$Be nuclei with a magnetic spectrograph.

Comparison of results with theoretical model calculations.

Abstract

The cross section for the reaction $p+^6\text{Li}\to\eta+^7\text{Be}$ was measured at an excess energy of 11.28 MeV above threshold by detecting the recoiling $^7$Be nuclei. A dedicated set of focal plane detectors was built for the magnetic spectrograph Big Karl and was used for identification and four momentum measurement of the $^7$Be. A differential cross section of $\frac{d\sigma}{d\Omega}=(0.69\pm{0.20}\text{(stat.)}\pm 0.20\text{(syst.)})\text{nb/sr}$ for the ground state plus the 1/2$^-$ was measured. The result is compared to model calculations.