Measurement of the He-4(gamma,n) reaction from 23 gamma <70 MeV

Summary, in English

A comprehensive set of 4He(,n) absolute cross-section measurements was performed at MAX-lab in Lund, Sweden. Tagged photons from 23<E<70 MeV were directed toward a liquid 4He target, and neutrons were identified using pulse-shape discrimination and the time-of-flight technique in two liquid-scintillator detector arrays. Seven-point angular distributions have been measured for 14 photon energies. The results have been subjected to complementary transition-coefficient and Legendre-coefficient analyses. The results are also compared to experimental data measured at comparable photon energies as well as recoil-corrected continuum shell-model, resonating group method, and effective interaction hyperspherical-harmonic expansion calculations. For photon energies below 29 MeV, the angle-integrated data are significantly larger than the values recommended by Calarco, Berman, and Donnelly in 1983.

• Författare: Björn Nilsson; Jan-Olof Adler; B-E Andersson; Kevin Fissum; Kurt Hansen; Lennart Isaksson; Martin Karlsson; Magnus Lundin; H Ruijter; Anders Sandell; Bent Schröder; [unknown] The MAX-lab Nuclear Physics Working Group
• Avdelning/ar: MAX IV-laboratoriet; Kärnfysik; Medicinsk strålningsfysik, Lund
• Publiceringsår: 2007
• Språk: Engelska
• Publikation/Tidskrift/Serie: Physical Review C (Nuclear Physics)
• Volym: 75
• Länkar: http://dx.doi.org/10.1103/PhysRevC.75.014007
• Dokumenttyp: Artikel i tidskrift
• Förlag: American Physical Society
• Ämne: Natural Sciences; Physical Sciences; Subatomic Physics
• Status: Published
• Projekt: Charge-Symmetry Breaking in the Giant Dipole Resonance Region; Nucleon Knockout with Electromagnetic Beams
• Forskningsgrupp: Photonuclear Research
• ISBN/ISSN/Övrigt: ISSN: 0556-2813