Study of the Isomeric State in $^{16}$N Using the $^{16}$N$^{g,m}$($d$,$^3$He) Reaction
T. L. Tang,
C. R. Hoffman,
B. P. Kay
et al.
Abstract:The isomeric state of 16 N was studied using the 16 N g,m (d, 3 He) proton-removal reactions at 11.8 MeV/u in inverse kinematics. The 16 N beam, of which 25% was in the isomeric state, was produced using the ATLAS in-fight system and delivered to the HELIOS spectrometer, which was used to analyze the 3 He ions from the (d, 3 He) reactions. The simultaneous measurement of reactions on both the ground and isomeric states, reduced the systematic uncertainties from the experiment and in the analysis. A direct and … Show more
“…A few applications of this approach are detailed in Refs. [1,2,3,4,5,6,7,8,9,10,11]. One reaction method that has shown promise for producing 16 N reaction from the DWBA approach at reaction energies of (a) 7.9 MeV/u and (b) 13.2 MeV/u.…”
An in-flight beam of 16 N was produced via the single-neutron adding (d,p) reaction in inverse kinematics at the recently upgraded Argonne Tandem Linear Accelerator System (ATLAS) in-flight system. The amount of the 16 N beam which resided in its excited 0.120-MeV J π = 0 − isomeric state (T 1/2 ≈ 5 µs) was determined to be 40(5)% at a reaction energy of 7.9(3) MeV/u, and 24(2)% at a reaction energy of 13.2(2) MeV/u. The isomer measurements took place at an experimental station ≈ 30 m downstream of the production target and utilized an Al beam-stopping foil and a HPGe Clover detector. Composite 16 N beam rate determinations were made at the experimental station and the focal plane of the Argonne in-flight radioactive ion-beam separator (RAISOR) with Si ∆E-E telescopes. A Distorted Wave Born Approximation (DWBA) approach was coupled with the known spectroscopic information on 16 N in order to estimate the relative 16 N isomer yields and composite 16 N beam rates. In addition to the observed reaction-energy dependence of the isomer fraction, a large sensitivity to angular acceptance of the recoils was also observed.
“…A few applications of this approach are detailed in Refs. [1,2,3,4,5,6,7,8,9,10,11]. One reaction method that has shown promise for producing 16 N reaction from the DWBA approach at reaction energies of (a) 7.9 MeV/u and (b) 13.2 MeV/u.…”
An in-flight beam of 16 N was produced via the single-neutron adding (d,p) reaction in inverse kinematics at the recently upgraded Argonne Tandem Linear Accelerator System (ATLAS) in-flight system. The amount of the 16 N beam which resided in its excited 0.120-MeV J π = 0 − isomeric state (T 1/2 ≈ 5 µs) was determined to be 40(5)% at a reaction energy of 7.9(3) MeV/u, and 24(2)% at a reaction energy of 13.2(2) MeV/u. The isomer measurements took place at an experimental station ≈ 30 m downstream of the production target and utilized an Al beam-stopping foil and a HPGe Clover detector. Composite 16 N beam rate determinations were made at the experimental station and the focal plane of the Argonne in-flight radioactive ion-beam separator (RAISOR) with Si ∆E-E telescopes. A Distorted Wave Born Approximation (DWBA) approach was coupled with the known spectroscopic information on 16 N in order to estimate the relative 16 N isomer yields and composite 16 N beam rates. In addition to the observed reaction-energy dependence of the isomer fraction, a large sensitivity to angular acceptance of the recoils was also observed.
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