학술논문
First Direct Measurement of Mg22(α,p)Al25 and Implications for X-Ray Burst Model-Observation Comparisons
Document Type
article
Author
Randhawa, JS; Ayyad, Y; Mittig, W; Meisel, Z; Ahn, T; Aguilar, S; Alvarez-Pol, H; Bardayan, DW; Bazin, D; Beceiro-Novo, S; Blankstein, D; Carpenter, L; Cortesi, M; Cortina-Gil, D; Gastis, P; Hall, M; Henderson, S; Kolata, JJ; Mijatovic, T; Ndayisabye, F; O’Malley, P; Pereira, J; Pierre, A; Robert, H; Santamaria, C; Schatz, H; Smith, J; Watwood, N; Zamora, JC
Source
Physical Review Letters. 125(20)
Subject
Language
Abstract
Type-I x-ray bursts can reveal the properties of an accreting neutron star system when compared with astrophysics model calculations. However, model results are sensitive to a handful of uncertain nuclear reaction rates, such as ^{22}Mg(α,p). We report the first direct measurement of ^{22}Mg(α,p), performed with the Active Target Time Projection Chamber. The corresponding astrophysical reaction rate is orders of magnitude larger than determined from a previous indirect measurement in a broad temperature range. Our new measurement suggests a less-compact neutron star in the source GS1826-24.