Observation ofαdecay from a state in10B at 11.48 MeV

Abstract

We report on the observation of α decay from a state in 10 B at 11.48 MeV. The only observed decay branch is to the first T = 1 state in 6 Li at 3.56 MeV. The apparent absence of an α-decay branch to the (T = 0) ground state in 6 Li suggests that the 11.48-MeV state should be assigned isospin T = 1. The spin and parity of the 11.48-MeV state could not be directly determined from the present study apart from J = 0 being ruled out by the observed angular correlation. We conjecture that the 11.48-MeV state is the analog of the 10.15-MeV, (4 + ) state in 10 Be, constitutes the third member of a rotational band built on the 0 + state at 7.65 MeV, and has pronounced molecular structure.

Properties of12C resonances determined from the10B(3He,Alcorta1, Borge2, Cubero3 et al. 2012Phys. Rev. CSelf Cite

“…Fortunately, it is possible to partly remove some of these channels. The α+ 10 B channel from the 11 B target has been the subject of a dedicated paper [26], and no narrow (<0.5 MeV) resonances seem to interfere with the data analyzed here. Contributions from relatively narrow states in 5 Li and 6 Li are removed by simply placing gates on the corresponding peaks in p-α and d-α relative-energy spectra.…”

Calibration and response function of a compact silicon-detector set-up for charged-particle spectroscopy using GEANT4

“…As will be shown later, the measured energy spectrum of the α-calibration source is rather well reproduced by the simulation in the full energy range of interest, therefore it can be used to obtain a realistic and physical response function. Since the response function depends on the energy of the particle detected, a set of simulations have been done, discretising the energy window of [2][3][4][5][6] MeV in bins of 20 keV. This window covers the energies of the four emissions of the α source (see Table 2) and the bin is set to half the resolution of the detectors.…”

“…The set-up characterised in this work was designed to become a general and compact detection system for β-delayed charged-particle spectroscopy. It has already been used in a few experiments performed at the ISOLDE a e-mail: enrique.nacher@csic.es b e-mail: olof.tengblad@csic.es c Present Address: Centro de Microanálisis de Materiales, Madrid, Spain facility at CERN: first time to study the β-delayed protons of 31 Ar and 33 Ar [1], this was continued with an experiment for a precise study of the β-delayed α -decay of 16 N [2], and also to study the breakup of 8 Be into two alpha particles following the β-decay of 8 B [3] [4]. All experiments were performed at the Isolde Decay Station (IDS) [5].…”