A deep hard X-ray survey of the INTEGRAL satellite first detected the non-thermal emission up to 90 keV in the Tycho supernova ( SN ) remnant .
Its 3 – 100 keV spectrum is fitted with a thermal bremsstrahlung of kT \sim 0.81 \pm 0.45 keV plus a power-law model of \Gamma \sim 3.01 \pm 0.16 .
Based on the diffusive shock acceleration theory , this non-thermal emission , together with radio measurements , implies that Tycho remnant may not accelerate protons up to > PeV but hundreds TeV .
Only heavier nuclei may be accelerated to the cosmic ray spectral “ knee ” .
In addition , we search for soft gamma-ray lines at 67.9 and 78.4 keV coming from the decay of radioactive ^ { 44 } Ti in Tycho remnant by INTEGRAL .
A bump feature in the 60-90 keV energy band , potentially associated with the ^ { 44 } Ti line emission , is found with a marginal significance level of \sim 2.6 \sigma .
The corresponding 3 \sigma upper limit on the ^ { 44 } Ti line flux amounts to 1.5 \times 10 ^ { -5 } ph cm ^ { -2 } s ^ { -1 } .
Implications on the progenitor of Tycho SN , considered to be the prototype of type Ia SN , are discussed .