10. The blessing of Shehechiyanu:[1]

It is permitted for a mourner to recite the blessing of Shehechiyanu during Shiva in all cases that it is to be recited [i.e. on a new fruit; upon lighting Chanukah candles; upon reading the Megillah on Purim; upon receiving the inheritance from his deceased relative; upon the birth of a son or daughter].

Reciting a public Shehechiyanu:[2] A mourner within Shiva, Shloshim or 12 months for a parent, is to avoid reciting a public blessing of Shehechiyanu, such as by a public Menorah lighting or public Megillah reading.

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[1] M”A 551:42; Sefer Chassidim 840; Birkeiy Yosef 551:15; Kaf Hachaim 551:204; 671:73; Sdei Chemed Aveilus 79 regarding new fruit; Birchas Habayis 24:54; Har Tzevi 1:116 regarding birth; Piskeiy Teshuvos 223:1; 225:9; So rule all Poskim regarding an inheritance: Admur in Seder Birchas Hanehnin 12:8; Michaber 223:2; Rambam Brachos 10:7; Brachos 59b

[2] Maharam Mintz 43; Taz 671:8; P”M 671 M”Z 8; Machazik Bracha 671:9; Chayeh Adam 154:17; Derech Hachaim 4; M”B 671:44; Shaareiy Teshuvah 671:7; Kaf Hachaim 671:73; See also regarding Megillah: M”B 692:1; Derech Hachaim 2; Kaf Hachaim 692:7

Other opinions: Some Poskim permit the Avel to recite Shehechiyanu even by a public lighting. [Olas Shmuel 106 that he has not seen the world be careful in this matter; Teshuvah Meahava 2:286; Mishmeres Shalom ibid; Gesher Hachaim 23:4; Beis Yitzchak Yoreh Deah 2:158; Minchas Elazar 2:32; See Nitei Gavriel 37:4; Piskeiy Teshuvos 692:6]