Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Massive-Star Nucleosynthesis and INTEGRAL   Products from massive-star nucleosynthesis have been measured with SPI on
INTEGRAL: Characteristic gamma-ray lines from radioactive decays of long-lived
26Al and 60Fe isotopes, and from 44Ti decay (decay time 89y). Detections of
both these isotopes has laid the foundation to peek into massive-star
interiors, through different views at those measurements. The gamma-ray flux
can be converted into amounts of these radioactive isotopes, but the
constraints which derive from this for massive star models involve additional
steps. -- Earlier results had demonstrated the basic constraints inherent to
such radioactivity data, i.e. detection of 26Al is a calibration for
massive-star yields, 60Fe enables an isotopic-yield ratio test eliminating
modeling and observing bias aspects, and 44Ti searches showed that its
production does not occur homogeneously over core-collapse events. The current
status of 26Al and 60Fe observations and their analysis is reaching a threshold
for astrophysical insights: Specific regions of massive star groups and their
radioactivity gamma-rays have recently been investigated, such as Sco-Cen and
Orion. As for 44Ti, spectroscopical information constrains ejection velocities
of these inner supernova ejecta for the Cas A event. These parameters for
massive stars can be related to other fields of astronomy, of nuclear physics
experiments and theory, and of theoretical astrophysics. Thus, model
improvements appear on the horizon, as e.g. implemented in the EuroGenesis
program framework of the European Science Foundation.

3
The categories of this paper are: physics
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con