Present Status and Future Perspectives of the NEXT Experiment

<table>Energy spectra for <sup>22</sup>Na gamma-ray events within the fiducial volume of <svg height="12.7125" id="M175" style="vertical-align:-0.15306pt" version="1.1" viewbox="0 0 101.175 12.7125" width="101.175" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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q-4 34 -24.5 47t-73.5 15v28h236z" id="x4E"></path></g><g transform="matrix(.017,-0,0,-.017,12.336,12.45)"><path d="M517 162l29 -4q-18 -100 -35 -158h-482v28q68 5 83.5 20t15.5 77v398q0 66 -13 80t-73 19v28h446q0 -8 8 -144l-29 -4q-11 51 -32 85q-11 17 -35 23t-78 6h-76q-23 0 -28 -5t-5 -27v-228h94q67 0 83 12t25 63h29v-191h-29q-10 54 -26 65.5t-81 11.5h-95v-189
q0 -65 24 -81q19 -13 104 -13q57 0 83 7t43 27q28 33 50 94z" id="x45"></path></g><g transform="matrix(.017,-0,0,-.017,23.674,12.45)"><path d="M655 0h-263v28q46 5 55.5 14.5t-5.5 34.5l-132 214q-69 -104 -122 -202q-19 -32 -10.5 -43.5t58.5 -17.5v-28h-229v28q44 5 70 17t47 40q47 59 164 239l-134 214q-33 50 -54 64t-74 20v28h246v-28q-44 -5 -52 -14t5 -28q32 -55 114 -182q66 102 99 162q19 33 10.5 44.5
t-57.5 17.5v28h228v-28q-56 -6 -80 -19.5t-58 -57.5q-45 -62 -121 -179l157 -246q35 -53 60.5 -70t77.5 -22v-28z" id="x58"></path></g><g transform="matrix(.017,-0,0,-.017,35.012,12.45)"><path d="M592 498l-30 -3q-13 63 -31 89q-13 19 -33.5 25.5t-75.5 6.5h-70v-493q0 -60 16 -75.5t86 -19.5v-28h-286v28q68 4 83.5 19.5t15.5 75.5v493h-62q-60 0 -83 -7t-33 -24q-12 -17 -32 -90h-29q10 116 12 180h20q10 -16 21 -20.5t34 -4.5h395q19 0 28.5 5t21.5 20h21
q2 -89 11 -177z" id="x54"></path></g><g transform="matrix(.017,-0,0,-.017,44.463,12.45)"><path d="M300 253l-14 -55h-229l14 55h229z" id="x2D"></path></g><g transform="matrix(.017,-0,0,-.017,50.124,12.45)"><path d="M43 650h280q194 0 282 -85q85 -82 85 -215q0 -173 -123 -267q-107 -83 -297 -83h-236v27q65 5 79.5 19.5t14.5 77.5v402q0 45 -6 62.5t-21.5 24t-57.5 9.5v28zM213 547v-416q0 -55 24.5 -75t81.5 -20q133 0 203 86t70 214q0 80 -30 143t-88 97q-66 41 -170 41
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q0 -65 24 -81q19 -13 104 -13q57 0 83 7t43 27q28 33 50 94z" id="x45"></path></g><g transform="matrix(.017,-0,0,-.017,73.735,12.45)"><path d="M861 0h-263v28q61 5 73 22t12 97l-4 408h-4l-244 -548h-20l-224 534h-2l-15 -285q-5 -98 -3 -166q1 -34 19.5 -45t72.5 -17v-28h-233v28q45 5 62.5 17t22.5 43q11 65 19 183l14 208q3 36 3.5 55t-2.5 37.5t-6.5 25t-16.5 13t-25.5 8t-39.5 4.5v28h164l228 -501l232 501
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</svg>. (a) The whole spectrum. (b) Zoom-in the photoelectric peak [<a href="/journals/ahep/2014/907067/#B41">41</a>].</table>

Advances in High Energy Physics

Present Status and Future Perspectives of the NEXT Experiment

Figure 27