Are there deformed bubble nuclei too

New shapes and structure of nuclei have been fascinating to nuclear physicists since long, however these have renewed attraction due to advancement in the experimental facilities and increasing accessibility to nuclei lying at extremes in the nuclear landscape. The advancements in experimental nuclear physics facilities have led our experimental access to many new shapes and structures in the nuclear physics, which exists in nuclear chart but do not occur naturally. This has been quite helpful in developing our understanding for some of the fundamental questions of astrophysics as well as nuclear physics and bridging the both. Because of these various possibilities, a thorough study of the stability of a bubble nucleus is called for. Possibility of the formation of bubble nuclei has been explored through different nuclear models and in different mass regions. The major concern in all these investigations has been to find out the reason for anomalous depletion of density in the center part, especially in the spherical cases. The main mechanism for the formation of bubble nuclei is the lack of particles in the center of nucleus which causes the s levels to be less bound than observed in the usual cases with the uniform density distribution. If the particles rise high enough in energy highest s level will be empty, hence depleting the central density of particles. Subsequently, the lower s levels being less bound will increase the radius and decrease the central part of density. This may be also interpreted as s-d orbital inversion as discussed by Zhao et al [1] and E Khan et al [2]. It has been also studied that at high nuclear temperature, the surface-tension coefficient may decrease resulting in pushing the nuclear matter outward, leading to the formation of toroidal and bubble nuclei [3]. In recent past, a few experimental accessible cases, e.g. O and Si have picked up a large attention due to significant depletion of nuclear density in the center part of nucleus. Here we have first time explored the possibility of observing deformed bubble nuclei and mechanism for the same.