P.D. O'Malley

Neutron-proton asymmetry dependence of spectroscopic factors in Ar isotopes

Spectroscopic factors have been extracted for proton-rich 34Ar and neutron-rich 46Ar using the (p, d) neutron transfer reaction. The experimental results show little reduction of the ground state neutron spectroscopic factor of the proton-rich nucleus 34Ar compared to that of 46Ar. The results suggest that correlations, which generally reduce such spectroscopic factors, do not depend strongly on the neutron-proton asymmetry of the nucleus in this isotopic region as was reported in knockout reactions. The present results are consistent with results from systematic studies of transfer reactions but inconsistent with the trends observed in knockout reaction measurements.

Halo Nucleus Be11: A Spectroscopic Study via Neutron Transfer

The best examples of halo nuclei, exotic systems with a diffuse nuclear cloud surrounding a tightly bound core, are found in the light, neutron-rich region, where the halo neutrons experience only weak binding and a weak, or no, potential barrier. Modern direct-reaction measurement techniques provide powerful probes of the structure of exotic nuclei. Despite more than four decades of these studies on the benchmark one-neutron halo nucleus 11Be, the spectroscopic factors for the two bound states remain poorly constrained. In the present work, the 10Be d;p reaction has been used in inverse kinematics at four beam energies to study the structure of 11Be. The spectroscopic factors extracted using the adiabatic model were found to be consistent across the four measurements and were largely insensitive to the optical potential used. The extracted spectroscopic factor for a neutron in an n j 2s1=2 state coupled to the ground state of 10Be is 0.71(5). For the first excited state at 0.32 MeV, a spectroscopic factor of 0.62(4) is found for the halo neutron in a 1p1=2 state.

Reactions of a 10 Be beam on proton and deuteron targets

The extraction of detailed nuclear structure information from transfer reactions requires reliable, well-normalized data, as well as optical potentials and a theoretical framework demonstrated to work well in the relevant mass and beam energy ranges. It is rare that the theoretical ingredients can be tested well for exotic nuclei owing to the paucity of data. The halo nucleus

Recent Direct Reaction Experimental Studies with Radioactive Tin Beams

{}^{11}

Development of ORRUBA: A Silicon Array for the Measurement of Transfer Reactions in Inverse Kinematics

Be has been examined through the

Single-neutron levels near the N=82 shell closure

{}^{10}

Unbound States of 32Cl Relevant for Novae

Be(

Unbound states of (32)Cl andthe (31)S(p,gamma)(32)Cl reaction rate

d,p

Unbound states of 32Cl and the 31S(p,\gamma)32Cl reaction rate

) reaction in inverse kinematics at equivalent deuteron energies of

Unbound states of {sup 32}Cl and the {sup 31}S(p,gamma){sup 32}Cl Reaction Rate

12,\phantom{\rule{0.28em}{0ex}}15,\phantom{\rule{0.28em}{0ex}}18,