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The main goal of this work is to characterize Nash equilibria through a verification theorem, which identifies a new system of quasivariational inequalities, whose solution gives equilibrium payoffs with the correspondent strategies. Moreover, we apply the verification theorem to a game with a one-dimensional state variable, evolving as a scaled Brownian motion, and with linear payoff and costs for both players. Two types of Nash equilibrium are fully characterized, i.e. semi-explicit expressions for the equilibrium strategies and associated payoffs are provided. Both equilibria are of threshold type: in one equilibrium players\u2019 intervention are not simultaneous, while in the other one the first player induces her competitor to stop the game. Finally, we provide some numerical results describing the qualitative properties of both types of equilibrium.<\/jats:p>","DOI":"10.1007\/s10957-020-01718-6","type":"journal-article","created":{"date-parts":[[2020,7,25]],"date-time":"2020-07-25T05:29:17Z","timestamp":1595654957000},"page":"688-724","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Nonzero-Sum Stochastic Differential Games Between an Impulse Controller and a Stopper"],"prefix":"10.1007","volume":"186","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3956-6795","authenticated-orcid":false,"given":"Luciano","family":"Campi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Davide","family":"De Santis","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,7,25]]},"reference":[{"key":"1718_CR1","doi-asserted-by":"publisher","first-page":"191","DOI":"10.1214\/lnms\/1215453573","volume":"30","author":"AP Maitra","year":"1996","unstructured":"Maitra, A.P., Sudderth, W.D.: The gambler and the stopper. 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