Hi Danny. I don't know where you are but I'm in the south of UK and also planted summer fruiting raspberries last November. Mine also looked like dead twigs until last Saturday when some buds appeared on about half of them. So, fingers crossed it's just the cold wet ground that's been holding them back and they'll soon spring into life and you'll be trying to stop them breaking out of their bed.
“Success is the ability to go from one failure to another with no loss of enthusiasm.” Winston Churchill
Hi, no they are not dead, you should see new growth/buds within the next 2 weeks, I’m in East Yorkshire & have seen early signs of growth in the last few days
I agree it's probably the cold wet soil that has held everything back. If you are really keen you could try a little scrape with a thumb nail on the bark if it is green underneath then they are alive! Give them another week or two if we get this promised warm sun the buds will break.
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A A Milne