particle system isn't visually there

i'm creating a simple game with a player and an enemy. but whenever it hit the enemy, i want there to be a particle system. when i'm playing the game, it says in the hierarchy that the particle system has played, but it didn't visually. does anyone know how to fix this?

here is my script:

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class cube : MonoBehaviour {

 public Gamemanager manager;
 public float moveSpeed;
 public Vector3 respawnPoint;
 public GameObject deathParticles;
 private Vector3 input;





 // Use this for initialization
 void Start () {
     moveSpeed = 7f;
     manager = manager.GetComponent<Gamemanager>();
     respawnPoint = transform.position;
 }

 
 // Update is called once per frame
 void FixedUpdate () {

     transform.Translate (moveSpeed * Input.GetAxis ("Horizontal") * Time.deltaTime, 0f, moveSpeed * Input.GetAxis ("Vertical") * Time.deltaTime);
 


     if (transform.position.y < -3) {

         die ();
     }


 }
 void OnTriggerEnter(Collider other)
 {
     if (other.tag == "Enemy") {


         die ();
     }

     if (other.transform.tag == "goal") 
     {
         manager.CompleteLevel ();

     }
 }

 void die ()
 {

     Instantiate (deathParticles, transform.position, Quaternion.identity);
     transform.position = respawnPoint;
 


 }

}