Low Energy Photodisintegration of the Deuteron and n-p Capture with Polarized Neutrons at HIγS/TUNL

Details Low Energy Photodisintegration of the Deuteron and n-p Capture with Polarized Neutrons at HIγS/TUNL Low Energy Photodisintegration of the Deuteron and n-p Capture with Polarized Neutrons at HIγS/TUNL

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.o4002a&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Among all the Big-Bang Nucleosynthesis (BBN) yield-relevant reactions p(n,γ)d is the most sensitive to predicting the value of the baryon density (Ω_Bh^2) (S. Burles et. al.), Phys. Rev. Letts. 82, 4176 (1999).. The world data on the p(n,γ)d or d(γ,n)p cross-section in the energy domain relevant to the BBN is sparse. Two complementary programs are in progress at TUNL and the High Intensity Gamma Source (HIγS) to study the p(n,γ)d and d(γ,n)p reactions. The capture experiment has been performed with polarized neutrons at En = 7.6 and 4 MeV. Analyzing power (A_y) has been measured at polar angles of ± 90^o w.r.t. the beam. A preliminary analysis of data at En = 7.6 indicates that A_y=-0.075±0.032. This result is in agreement with potential model (PM)(H. Arenhövel et. al.), Few Body Systems, Sup. 3 (1991). and effective field theory (EFT)(J.-W. Chen at. al.), Phys. Rev. C 60, 65205 (1999). predictions. The data at 4 MeV is under analysis. A program has been initiated at HIγS to measure the photon asymmetry (Σ) in the d(γ,n)p process using linearly polarized γ-rays. The first experiment was completed at γ energies of 6, 4, 3.5, and 2.6 MeV. The asymmetry, which is a direct measurement of the M1 relative contribution to the cross-section, has been obtained for polar angles, θ, between 22.5 and 157.5 degrees. The near threshold M1 strength which will be deduced from these measurements will provide insight into the GDH integrand for the deuteron in this region, which is predicted to contain a large negative contribution arising from the ^1S0 M1 strength.

Affiliated with

Also associated with

No associations

Rating

Low Energy Photodisintegration of the Deuteron and n-p Capture with Polarized Neutrons at HIγS/TUNL does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Low Energy Photodisintegration of the Deuteron and n-p Capture with Polarized Neutrons at HIγS/TUNL, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low Energy Photodisintegration of the Deuteron and n-p Capture with Polarized Neutrons at HIγS/TUNL will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1534629