Cross section of He3(α,γ)Be7 around the Be7 proton separation threshold

T. Szücs, G. G. Kiss, Gy. Gyürky, Z. Halász, T. N. Szegedi, and Zs. Fülöp
Phys. Rev. C 99, 055804 – Published 7 May 2019; Erratum Phys. Rev. C 105, 069901 (2022)

Abstract

Background: The He3(α,γ)Be7 reaction is a widely studied nuclear reaction; however, it is still not understood with the required precision. It has a great importance both in Big Bang nucleosynthesis and in solar hydrogen burning. The low mass number of the reaction partners makes it also suitable for testing microscopic calculations.

Purpose: Despite the high number of experimental studies, none of them addresses the He3(α,γ)Be7 reaction cross sections above 3.1-MeV center-of-mass energy. Recently, a previously unobserved resonance in the Li6(p,γ)Be7 reaction suggested a new level in Be7, which would also have an impact on the He3(α,γ)Be7 reaction in the energy range above 4.0 MeV. The aim of the present experiment is to measure the He3(α,γ)Be7 reaction cross section in the energy range of the proposed level.

Method: For this investigation the activation technique was used. A thin window gas-cell target confining He3 gas was irradiated using an α beam. The Be7 produced was implanted into the exit foil. The Be7 activity was determined by counting the γ rays following its decay by a well-shielded high-purity germanium detector.

Results: Reaction cross sections have been determined between Ecm=4.0and4.4 MeV with 0.04-MeV steps covering the energy range of the proposed nuclear level. One lower-energy cross-section point was also determined to be able to compare the results with previous studies.

Conclusions: A constant cross section of around 10.5 μb was observed around the Be7 proton separation energy. An upper limit of 45 neV for the strength of a He3(α,γ)Be7 resonance is derived.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 12 November 2018
  • Revised 26 February 2019

DOI:https://doi.org/10.1103/PhysRevC.99.055804

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Erratum

Erratum: Cross section of He3(α,γ) Be7 around the Be7 proton separation threshold [Phys. Rev. C 99, 055804 (2019)]

T. Szücs, G. G. Kiss, Gy. Gyürky, Z. Halász, T. N. Szegedi, and Zs. Fülöp
Phys. Rev. C 105, 069901 (2022)

Authors & Affiliations

T. Szücs1,*, G. G. Kiss1, Gy. Gyürky1, Z. Halász1, T. N. Szegedi1,2, and Zs. Fülöp1

  • 1Institute for Nuclear Research (MTA Atomki), Debrecen, Hungary
  • 2University of Debrecen, Debrecen, Hungary

  • *Present address: Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany; szucs.tamas@atomki.mta.hu

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 99, Iss. 5 — May 2019

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×