Htaccess does not redirect dynamic part in url

I'm trying to redirect the following url: to this one:

With the following code:
RewriteRule ^samples_gallery.php$ /gallery/subject [L,R=301]
RewriteCond %{QUERY_STRING} ^browse_by=subject&detail=11$

However, when done, I get the following url in response:

How to I make the condition to eliminate the dynamic part?
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Just put a question mark on the end of the URL you're redirecting to e.g. /gallery/subject?

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poemorellaAuthor Commented:
That worked great. Many thanks.
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