How to destroy a gameObject only when inside a rigidBody

Hello ,

I'm trying to make a rythm music game, where notes in shape of sphere will drop down on a table and once user hit the correct key(1 to 6) , I want the correct note to explode depends on which rail is the note , So my logic goes like this :

As you can see I have an invisible rigid body , so while the note is inside of it , if user hit the correct key , I wanted the note to explode

and my note Control script goes like this :

     void Update () {
         if (Input.GetKeyDown(activate))
         {
             if (score)
             {
 
                 Debug.Log(gameObject.name);
                 Destroy(gameObject);
 
                 Instantiate(succBurst, transform.position, succBurst.rotation);
                 score = false;
             }
 
         }
 
     }
 
     void OnTriggerEnter(Collider other)
     {
         
         Debug.Log(other.gameObject.name);
 
 
         if (other.gameObject.name == "FailedCol")
         {
             Destroy(gameObject);
       
             Instantiate(failedBurst, transform.position, failedBurst.rotation);
         }
 
        if( (other.gameObject.name == "score1"))
         {
 //The Ballon is inside the scoring rigid body which is the invisible part on picture 
                 score = true; 
                
             }
     
     
         }
     
     }

But it seems not to work properly , how to destroy the gameObject ( the note ) prefab Only when inside the rigid body? What is wrong with my code and what I have missed?

Thank you